What is the CVSS score of CVE-2026-23343?

CVE-2026-23343 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-23343?

Yes, a patch is available for CVE-2026-23343. Update the affected software to the latest version immediately.

Linux CVE-2026-23343

EUVD-2026-15310 HIGH

Out-of-bounds Write (CWE-787)

2026-03-25 Linux

GHSA-rqf2-6q66-wgpp

Buffer Overflow Linux Memory Corruption Canonical

7.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-787 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, write limits MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	While no CVSS score or EPSS probability is provided, the technical signals indicate moderate-to-high real-world risk within specific deployment contexts. The vulnerability requires three convergent conditions: (1) use of XDP with bpf_xdp_frags_increase_tail() operations, (2) an Ethernet driver reporting incorrect frag_size values (confirmed for ixgbevf), and (3) specific packet sizes that trigger negative tailroom calculations (demonstrated via xskxceiver's XDP_ADJUST_TAIL_GROW_MULTI_BUFF test). The exploit is not remotely exploitable via network attack alone but requires XDP program control, placing it in the local/privileged execution category. The presence of multiple segmentation faults and general protection faults in kernel memory structures (lookup_swap_cgroup_id crashes shown in stack traces) indicates achievable memory corruption with potential for denial of service and potentially privilege escalation if exploited in the right context. KEV status is not listed, suggesting no active weaponization observed at disclosure time. The availability of six kernel commits across stable branches (referenced at git.kernel.org) indicates patches have been rapidly deployed.
Exploit ScenarioDerived	An attacker with privileges to load XDP programs (typically requiring root or CAP_SYS_ADMIN) on a system running a vulnerable Linux kernel with ixgbevf driver crafts an XDP program that calls bpf_xdp_frags_increase_tail() with a growth request designed to trigger negative tailroom calculation. When a packet with specific size characteristics (e.g., 6 KB with 2 buffers of 3 KB each with non-zero page offset) is processed, the incorrect unsigned integer wraparound causes out-of-bounds heap writes, resulting in memory corruption of swap_cgroup_id structures or other kernel objects. This leads to segmentation faults and general protection faults observable in kernel crash logs, enabling denial of service or potential privilege escalation depending on the corrupted memory region.

Act Now Prioritize within 24-48h. Why: Active threat signals + CRITICAL/HIGH severity.

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 25, 2026

A memory corruption vulnerability exists in the Linux kernel's XDP (eXpress Data Path) subsystem where negative tailroom calculations are incorrectly reported as large unsigned integers, allowing buffer overflows during tail growth operations. This affects Linux kernel versions across multiple stable branches when certain Ethernet drivers (notably ixgbevf) report incorrect DMA write sizes, leading to heap corruption, segmentation faults, and general protection faults as demonstrated in the xskxceiver test utility. The vulnerability has no CVSS score assigned and shows no active KEV exploitation status, but represents a critical memory safety issue affecting systems using XDP with affected Ethernet drivers.

RemediationAI

Immediately apply the latest kernel security patches from your Linux distribution's stable branch to obtain fixes from the referenced kernel commits (verify your kernel version against the patched versions at https://git.kernel.org/stable/). For distributions based on affected stable branches, check your vendor's advisory (Canonical for Ubuntu, Red Hat for RHEL, etc.) for backported versions. Until patching is possible, disable XDP processing on systems with ixgbevf or similar affected drivers if the functionality is not critical, or restrict XDP program loading to trusted administrators only via seccomp or AppArmor policies. Additionally, verify that your Ethernet driver correctly reports frag_size as true page allocation size (typically 4 KB) rather than DMA write size; contact your NIC vendor if discrepancies exist. Monitor systems for segmentation faults and general protection faults in kernel memory management functions as warning signs of exploitation.

Affected VersionsENISA

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <94b9da7e9f958cb3d115b21eff824ecd8c3217aa

Linux patch: 7.0-rc3

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <a0fb59f527d03c60b2cd547cfae4a842ad84670f

Linux patch: 0

Linux patch: 6.12.77

Linux patch: 6.18.17

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <8821e857759be9db3cde337ad328b71fe5c8a55f

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <c7c790a07697148c41e2d03eb28efe132adda749

Linux patch: 6.19.7

Linux patch: 6.6.130

Linux 5.18

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <01379540452a02bbc52f639d45dd365cd3624efb

Linux patch: 6.1.167

Linux bf25146a5595269810b1f47d048f114c5ff9f544 <98cd8b4d0b836d3edf70161f40efd9cbb8c8f252

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability resides in the Linux kernel's XDP buffer management subsystem, specifically in the bpf_xdp_frags_increase_tail() function and its interaction with the rxq->frag_size field. The root cause is a type casting issue (CWE-195: Signed to Unsigned Type Conversion Error) where a calculated negative tailroom value, when stored in an unsigned integer, wraps around to a value near UINT_MAX instead of properly triggering an -EINVAL error condition. Ethernet drivers like ixgbevf report DMA write size (3 KB) as frag_size instead of true page size (4 KB), and when combined with non-zero page offsets, this produces negative tailroom that is misinterpreted due to the unsigned integer representation. The affected CPE is cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*, indicating all Linux kernel versions are potentially vulnerable depending on driver configuration. The XDP subsystem is a kernel-level packet processing framework used in high-performance networking scenarios.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SUSE 5.5 MEDIUM

AV:L/AC:L/PR:L/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

High

Integrity

High

Availability

High

Lifecycle Timeline

CVSS changed

Apr 23, 2026 - 21:27 NVD

7.8 (HIGH)

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 25, 2026 - 10:27 nvd

N/A

DescriptionNVD

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

xdp: produce a warning when calculated tailroom is negative

Many ethernet drivers report xdp Rx queue frag size as being the same as DMA write size. However, the only user of this field, namely bpf_xdp_frags_increase_tail(), clearly expects a truesize.

Such difference leads to unspecific memory corruption issues under certain circumstances, e.g. in ixgbevf maximum DMA write size is 3 KB, so when running xskxceiver's XDP_ADJUST_TAIL_GROW_MULTI_BUFF, 6K packet fully uses all DMA-writable space in 2 buffers. This would be fine, if only rxq->frag_size was properly set to 4K, but value of 3K results in a negative tailroom, because there is a non-zero page offset.

We are supposed to return -EINVAL and be done with it in such case, but due to tailroom being stored as an unsigned int, it is reported to be somewhere near UINT_MAX, resulting in a tail being grown, even if the requested offset is too much (it is around 2K in the abovementioned test). This later leads to all kinds of unspecific calltraces.

[ 7340.337579] xskxceiver[1440]: segfault at 1da718 ip 00007f4161aeac9d sp 00007f41615a6a00 error 6 [ 7340.338040] xskxceiver[1441]: segfault at 7f410000000b ip 00000000004042b5 sp 00007f415bffecf0 error 4 [ 7340.338179] in libc.so.6[61c9d,7f4161aaf000+160000] [ 7340.339230] in xskxceiver[42b5,400000+69000] [ 7340.340300] likely on CPU 6 (core 0, socket 6) [ 7340.340302] Code: ff ff 01 e9 f4 fe ff ff 0f 1f 44 00 00 4c 39 f0 74 73 31 c0 ba 01 00 00 00 f0 0f b1 17 0f 85 ba 00 00 00 49 8b 87 88 00 00 00 <4c> 89 70 08 eb cc 0f 1f 44 00 00 48 8d bd f0 fe ff ff 89 85 ec fe [ 7340.340888] likely on CPU 3 (core 0, socket 3) [ 7340.345088] Code: 00 00 00 ba 00 00 00 00 be 00 00 00 00 89 c7 e8 31 ca ff ff 89 45 ec 8b 45 ec 85 c0 78 07 b8 00 00 00 00 eb 46 e8 0b c8 ff ff <8b> 00 83 f8 69 74 24 e8 ff c7 ff ff 8b 00 83 f8 0b 74 18 e8 f3 c7 [ 7340.404334] Oops: general protection fault, probably for non-canonical address 0x6d255010bdffc: 0000 [#1] SMP NOPTI [ 7340.405972] CPU: 7 UID: 0 PID: 1439 Comm: xskxceiver Not tainted 6.19.0-rc1+ #21 PREEMPT(lazy) [ 7340.408006] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-5.fc42 04/01/2014 [ 7340.409716] RIP: 0010:lookup_swap_cgroup_id+0x44/0x80 [ 7340.410455] Code: 83 f8 1c 73 39 48 ba ff ff ff ff ff ff ff 03 48 8b 04 c5 20 55 fa bd 48 21 d1 48 89 ca 83 e1 01 48 d1 ea c1 e1 04 48 8d 04 90 <8b> 00 48 83 c4 10 d3 e8 c3 cc cc cc cc 31 c0 e9 98 b7 dd 00 48 89 [ 7340.412787] RSP: 0018:ffffcc5c04f7f6d0 EFLAGS: 00010202 [ 7340.413494] RAX: 0006d255010bdffc RBX: ffff891f477895a8 RCX: 0000000000000010 [ 7340.414431] RDX: 0001c17e3fffffff RSI: 00fa070000000000 RDI: 000382fc7fffffff [ 7340.415354] RBP: 00fa070000000000 R08: ffffcc5c04f7f8f8 R09: ffffcc5c04f7f7d0 [ 7340.416283] R10: ffff891f4c1a7000 R11: ffffcc5c04f7f9c8 R12: ffffcc5c04f7f7d0 [ 7340.417218] R13: 03ffffffffffffff R14: 00fa06fffffffe00 R15: ffff891f47789500 [ 7340.418229] FS: 0000000000000000(0000) GS:ffff891ffdfaa000(0000) knlGS:0000000000000000 [ 7340.419489] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7340.420286] CR2: 00007f415bfffd58 CR3: 0000000103f03002 CR4: 0000000000772ef0 [ 7340.421237] PKRU: 55555554 [ 7340.421623] Call Trace: [ 7340.421987] <TASK> [ 7340.422309] ? softleaf_from_pte+0x77/0xa0 [ 7340.422855] swap_pte_batch+0xa7/0x290 [ 7340.423363] zap_nonpresent_ptes.constprop.0.isra.0+0xd1/0x270 [ 7340.424102] zap_pte_range+0x281/0x580 [ 7340.424607] zap_pmd_range.isra.0+0xc9/0x240 [ 7340.425177] unmap_page_range+0x24d/0x420 [ 7340.425714] unmap_vmas+0xa1/0x180 [ 7340.426185] exit_mmap+0xe1/0x3b0 [ 7340.426644] __mmput+0x41/0x150 [ 7340.427098] exit_mm+0xb1/0x110 [ 7340.427539] do_exit+0x1b2/0x460 [ 7340.427992] do_group_exit+0x2d/0xc0 [ 7340.428477] get_signal+0x79d/0x7e0 [ 7340.428957] arch_do_signal_or_restart+0x34/0x100 [ 7340.429571] exit_to_user_mode_loop+0x8e/0x4c0 [ 7340.430159] do_syscall_64+0x188/ ---truncated---

Threat Intelligence Overview

EPSS Score

0.0%

Top 93% exploitable

Threat Intel

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 HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat Yes

Deciding rule

Active threat signals + CRITICAL/HIGH severity

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: +10

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

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Vendor StatusVendor

Debian

linux

Release	Status	Fixed Version	Urgency
bullseye	not-affected	-	-
bullseye (security)	fixed	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, sid	fixed	6.19.8-1	-
(unstable)	fixed	6.19.8-1	-

SUSE

Severity: Medium

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7	Fixed

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-2026-23343 ADVISORY https://ubuntu.com/security/notices/USN-8567-1 ADVISORY https://vuldb.com/vuln/353092 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/01379540452a02bbc52f639d45dd365cd3624efb REF https://git.kernel.org/stable/c/8821e857759be9db3cde337ad328b71fe5c8a55f REF https://git.kernel.org/stable/c/94b9da7e9f958cb3d115b21eff824ecd8c3217aa REF https://git.kernel.org/stable/c/98cd8b4d0b836d3edf70161f40efd9cbb8c8f252 REF https://git.kernel.org/stable/c/a0fb59f527d03c60b2cd547cfae4a842ad84670f REF https://git.kernel.org/stable/c/c7c790a07697148c41e2d03eb28efe132adda749

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