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Linux EUVDEUVD-2026-13613

| CVE-2026-23277 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-03-20 Linux
Denial Of Service Linux Null Pointer Dereference
5.5
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-476
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 20, 2026

A NULL pointer dereference vulnerability exists in the Linux kernel's TEQL (Trivial Ethernet Queue Limiting) network scheduler when transmitting through tunnel slave devices, particularly gretap tunnels. The vulnerability occurs because teql_master_xmit() fails to update skb->dev to the slave device before transmission, causing tunnel xmit functions to reference unallocated per-CPU statistics on the TEQL master device. This allows a local or networked attacker to trigger a kernel page fault and crash the system, resulting in a denial of service. No CVSS score, EPSS risk score, or KEV active exploitation status is currently published, but patch commits are available in Linux kernel stable branches (6.18.19, 6.19.9, and 7.0-rc4).

Affected VersionsENISA

Linux 039f50629b7f860f36644ed1f34b27da9aa62f43 <0bad9c86edd22dec4df83c2b29872d66fd8a2ff4
Linux 4.5
Linux 039f50629b7f860f36644ed1f34b27da9aa62f43 <21ea283c2750c8307aa35ee832b0951cc993c27d
Linux patch: 6.18.19
Linux 039f50629b7f860f36644ed1f34b27da9aa62f43 <0cc0c2e661af418bbf7074179ea5cfffc0a5c466
Linux patch: 0
Linux patch: 7.0-rc4
Linux patch: 6.19.9

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Ubuntu MEDIUM
SUSE 5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat 5.5 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
CVSS changed
Jul 14, 2026 - 13:22 NVD
5.5 (MEDIUM)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
CVE Published
Mar 20, 2026 - 08:08 nvd
N/A

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit

teql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit through slave devices, but does not update skb->dev to the slave device beforehand.

When a gretap tunnel is a TEQL slave, the transmit path reaches iptunnel_xmit() which saves dev = skb->dev (still pointing to teql0 master) and later calls iptunnel_xmit_stats(dev, pkt_len). This function does:

get_cpu_ptr(dev->tstats)

Since teql_master_setup() does not set dev->pcpu_stat_type to NETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats for teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes NULL + __per_cpu_offset[cpu], resulting in a page fault.

BUG: unable to handle page fault for address: ffff8880e6659018 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 68bc067 P4D 68bc067 PUD 0 Oops: Oops: 0002 [#1] SMP KASAN PTI RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89) Call Trace: <TASK> ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847) __gre_xmit (net/ipv4/ip_gre.c:478) gre_tap_xmit (net/ipv4/ip_gre.c:779) teql_master_xmit (net/sched/sch_teql.c:319) dev_hard_start_xmit (net/core/dev.c:3887) sch_direct_xmit (net/sched/sch_generic.c:347) __dev_queue_xmit (net/core/dev.c:4802) neigh_direct_output (net/core/neighbour.c:1660) ip_finish_output2 (net/ipv4/ip_output.c:237) __ip_finish_output.part.0 (net/ipv4/ip_output.c:315) ip_mc_output (net/ipv4/ip_output.c:369) ip_send_skb (net/ipv4/ip_output.c:1508) udp_send_skb (net/ipv4/udp.c:1195) udp_sendmsg (net/ipv4/udp.c:1485) inet_sendmsg (net/ipv4/af_inet.c:859) __sys_sendto (net/socket.c:2206)

Fix this by setting skb->dev = slave before calling netdev_start_xmit(), so that tunnel xmit functions see the correct slave device with properly allocated tstats.

Threat Intelligence Overview

EPSS Score
0.0%
Top 96% exploitable
Threat Intel
3
1 source
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS CISA Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: +10
Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Related Vulnerabilities in Linux Kernel Network and Event Handling

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CVE-2026-23278 HIGH
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CVE-2026-23273 HIGH
7.8
CVE-2026-23276 MEDIUM
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CVE-2026-23274 HIGH
7.8
CVE-2026-23275 HIGH
7.8

Same weakness CWE-476 – NULL Pointer Dereference

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CVE-2016-0742 HIGH
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CVE-2014-3470 MEDIUM
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CVE-2020-1967 HIGH POC
7.5
CVE-2017-3730 HIGH POC
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CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
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CVE-2021-3449 MEDIUM
5.9
CVE-2015-3194 HIGH
7.5

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

Ubuntu

Priority: Medium
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jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-iot
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-intel-iot-realtime
Release Status Version
jammy ignored superseded by Ubuntu Pro ppa version
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-5.19
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.2
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.2
linux-lowlatency-hwe-6.2
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.5
linux-lowlatency-hwe-6.5
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.8
linux-lowlatency-hwe-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-6.11
Release Status Version
jammy DNE -
noble ignored replaced by linux-hwe-6.14
questing DNE -
upstream ignored replaced by linux-hwe-6.14
linux-nvidia
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-6.2
Release Status Version
jammy ignored superseded by linux-nvidia-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-nvidia-6.5
linux-nvidia-6.5
Release Status Version
jammy ignored superseded by linux-nvidia-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-nvidia-6.8
linux-nvidia-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-nvidia-6.11
Release Status Version
jammy DNE -
noble ignored end of kernel support
questing DNE -
upstream ignored end of kernel support
linux-nvidia-lowlatency
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra-igx
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle
Release Status Version
xenial needs-triage -
bionic needs-triage -
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream needs-triage -
linux-oracle-5.0
Release Status Version
bionic ignored superseded by linux-oracle-5.3
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.3
linux-oracle-5.3
Release Status Version
bionic ignored superseded by linux-oracle-5.4
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.4
linux-oracle-5.4
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-5.8
Release Status Version
focal ignored superseded by linux-oracle-5.11
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.11
linux-oracle-5.11
Release Status Version
focal ignored superseded by linux-oracle-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.13
linux-oracle-5.13
Release Status Version
focal ignored superseded by linux-oracle-5.15
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.15
linux-oracle-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-6.5
Release Status Version
jammy ignored superseded by linux-oracle-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-6.8
linux-oracle-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-6.14
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oracle-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oem
Release Status Version
bionic ignored replaced by linux-hwe-5.4
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
linux-oem-5.6
Release Status Version
focal ignored superseded by linux-oem-5.10
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.10
linux-oem-5.10
Release Status Version
focal ignored superseded by linux-oem-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.13
linux-oem-5.13
Release Status Version
focal ignored superseded by linux-oem-5.14
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.14
linux-oem-5.14
Release Status Version
focal ignored replaced by linux-hwe-5.15
jammy DNE -
noble DNE -
questing DNE -
upstream ignored replaced by linux-hwe-5.15
linux-oem-5.17
Release Status Version
jammy ignored superseded by linux-oem-6.1
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.1
linux-oem-6.0
Release Status Version
jammy ignored superseded by linux-oem-6.1
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.1
linux-oem-6.1
Release Status Version
jammy ignored superseded by linux-oem-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.5
linux-oem-6.5
Release Status Version
jammy ignored superseded by linux-oem-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.8
linux-oem-6.8
Release Status Version
jammy DNE -
noble ignored superseded by linux-oem-6.14
questing DNE -
upstream ignored superseded by linux-oem-6.14
linux-oem-6.11
Release Status Version
jammy DNE -
noble ignored superseded by linux-oem-6.14
questing DNE -
upstream ignored superseded by linux-oem-6.14
linux-oem-6.14
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oem-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-raspi
Release Status Version
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream needs-triage -
linux-raspi2
Release Status Version
focal ignored replaced by linux-raspi
jammy DNE -
noble DNE -
questing DNE -
upstream ignored replaced by linux-raspi
linux-raspi-5.4
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-raspi-realtime
Release Status Version
jammy DNE -
noble ignored superseded by Ubuntu Pro ppa version
questing DNE -
upstream needs-triage -
linux-realtime
Release Status Version
jammy ignored superseded by Ubuntu Pro ppa version
noble ignored superseded by Ubuntu Pro ppa version
questing needs-triage -
upstream needs-triage -
linux-realtime-6.8
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-realtime-6.14
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv
Release Status Version
focal ignored superseded by linux-riscv-5.8
jammy ignored end of kernel support
noble ignored replaced by linux-riscv-6.14
questing needs-triage -
upstream needs-triage -
linux-riscv-5.8
Release Status Version
focal ignored superseded by linux-riscv-5.11
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-5.11
linux-riscv-5.11
Release Status Version
focal ignored superseded by linux-riscv-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-5.13
linux-riscv-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv-5.19
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-riscv-6.5
Release Status Version
jammy ignored superseded by linux-riscv-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-6.8
linux-riscv-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv-6.14
Release Status Version
jammy DNE -
noble ignored superseded by linux-riscv-6.17
questing DNE -
upstream ignored superseded by linux-riscv-6.17
linux-riscv-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-starfive-5.19
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-starfive-6.2
Release Status Version
jammy ignored superseded by linux-starfive-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-starfive-6.5
linux-starfive-6.5
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-xilinx
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-xilinx-zynqmp
Release Status Version
focal needs-triage -
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-realtime-6.17
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -

Debian

linux
Release Status Fixed Version Urgency
bullseye vulnerable 5.10.223-1 -
bullseye (security) vulnerable 5.10.251-1 -
bookworm vulnerable 6.1.159-1 -
bookworm (security) vulnerable 6.1.164-1 -
trixie vulnerable 6.12.73-1 -
trixie (security) vulnerable 6.12.74-2 -
forky vulnerable 6.19.6-2 -
sid vulnerable 6.19.8-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.127 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.144 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.161 Affected
Container suse/sl-micro/6.1/baremetal-os-container:latest Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.114 Affected

Threat IntelligenceMISP

CISA Advisories
ICSA-26-209-04 ICSA-26-295-11 ICSA-26-295-16
Sources: CISA (public domain)

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-23277 ADVISORY https://ubuntu.com/security/notices/USN-8567-1 ADVISORY https://vuldb.com/?id.352023 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1573/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1661/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1668/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21114/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21123/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21129/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21131/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21230/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21237/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21241/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21255/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21352/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:21361/ REF https://cert-portal.siemens.com/productcert/html/ssa-019113.html REF https://cert-portal.siemens.com/productcert/html/ssa-082556.html REF https://cert-portal.siemens.com/productcert/html/ssa-457936.html REF https://cert-portal.siemens.com/productcert/html/ssa-784472.html REF https://git.kernel.org/stable/c/0bad9c86edd22dec4df83c2b29872d66fd8a2ff4 REF https://git.kernel.org/stable/c/0cc0c2e661af418bbf7074179ea5cfffc0a5c466 REF https://git.kernel.org/stable/c/21ea283c2750c8307aa35ee832b0951cc993c27d REF https://git.kernel.org/stable/c/383493b9940e3d1b5517424081b3e072e20ec43c REF https://git.kernel.org/stable/c/57c153249143333bbf4ecf927bdf8aa2696ee397 REF https://git.kernel.org/stable/c/59b06d8b9bdb6b64b3c534c18da68bce5ccd31be REF https://git.kernel.org/stable/c/6b1f563d670162e188a0f2aec39c24b67b106e17 REF https://git.kernel.org/stable/c/81a43e8005366f16e629d8c95dfe05beaa8d36a7

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