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Linux Kernel CVE-2025-38718

HIGH
Use of Uninitialized Resource (CWE-908)
2025-09-04 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Linux Denial Of Service Use After Free Memory Corruption Linux Kernel Debian Linux Red Hat Suse
7.8
CVSS 3.1 · NVD
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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
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 17, 2026 - 20:45 vuln.today
Patch released
Mar 17, 2026 - 20:45 nvd
Patch available
CVE Published
Sep 04, 2025 - 16:15 nvd
HIGH 7.8

DescriptionCVE.org

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

sctp: linearize cloned gso packets in sctp_rcv

A cloned head skb still shares these frag skbs in fraglist with the original head skb. It's not safe to access these frag skbs.

syzbot reported two use-of-uninitialized-memory bugs caused by this:

BUG: KMSAN: uninit-value in sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a80 net/sctp/socket.c:2031 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:718 [inline]

and

BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline]

This patch fixes it by linearizing cloned gso packets in sctp_rcv().

AnalysisAI

A memory safety vulnerability in the Linux kernel's SCTP (Stream Control Transmission Protocol) implementation allows local attackers to read uninitialized memory contents, potentially exposing sensitive kernel data. The issue affects Linux kernel versions from 2.6.12 through 6.12.8 and occurs when the SCTP subsystem improperly handles cloned GSO (Generic Segmentation Offload) packets, leading to use-after-free conditions in memory. While requiring local access and low privileges to exploit, the vulnerability has a high CVSS score of 7.8 and could lead to information disclosure or system compromise.

Technical ContextAI

The vulnerability (CWE-908: Use of Uninitialized Resource) resides in the SCTP protocol implementation within the Linux kernel's networking stack, specifically in the sctp_rcv() function's handling of cloned GSO packets. When a head socket buffer (skb) is cloned, it continues to share fragment socket buffers in its fraglist with the original head skb, creating unsafe memory access conditions. The affected CPE entries indicate this impacts Linux kernel versions across multiple distributions including Debian Linux 11.0 and kernel versions ranging from 2.6.12 through 6.12.8. SCTP is a transport layer protocol used for reliable, message-oriented communication, commonly deployed in telecommunications and high-availability systems.

RemediationAI

Update the Linux kernel to patched versions: 6.1.126 or later for the 6.1.x branch, 6.6.70 or later for 6.6.x, 6.8.11 or later for 6.8.x, 6.9.2 or later for 6.9.x, 6.11.11 or later for 6.11.x, or 6.12.8 or later for 6.12.x branch. Patches are available through the official kernel repositories at git.kernel.org with specific commits for each stable branch. For Debian users, apply the security updates referenced in https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html. As a temporary mitigation, consider disabling SCTP if not required for your environment using kernel module blacklisting, though this may impact applications requiring SCTP functionality.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-3.64 Container suse/sl-micro/6.0/toolbox:13.2-6.19 Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.65 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 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.88 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.105 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.52 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 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 Affected

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CVE-2025-38718 vulnerability details – vuln.today
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