Use of Uninitialized Variable in Linux kernel - CVE-2026-31427
Published: April 14, 2026
Vulnerability identifier: #VU125855
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31427
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause incorrect SDP address rewriting.
The vulnerability exists due to use of uninitialized memory in process_sdp in nf_conntrack_sip when processing SDP bodies. A remote attacker can send a specially crafted SDP message to cause incorrect SDP address rewriting.
When stack auto-initialization is enabled, the rewritten session-level addresses may become 0.0.0.0; otherwise, stale stack data may be used.
How to mitigate CVE-2026-31427
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/01f34a80ac23ae90b1909b94b4ed05343a62f646
- https://git.kernel.org/stable/c/52fdda318ef2362fc5936385bcb8b3d0328ee629
- https://git.kernel.org/stable/c/6a2b724460cb67caed500c508c2ae5cf012e4db4
- https://git.kernel.org/stable/c/6e5e3c87b7e6212f1d8414fc2e4d158b01e12025
- https://git.kernel.org/stable/c/7edca70751b9bdb5b83eed53cde21eccf3c86147
- https://git.kernel.org/stable/c/fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6