PT-2026-34981 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-06 · CVE-2026-31629

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use-after-free issue exists in the NFC LLCP component. In the functions nfc llcp recv hdlc() and nfc llcp recv disc(), when the socket state is LLCP CLOSED, the code calls release sock() and nfc llcp sock put() but fails to return. This causes execution to fall through and call these functions a second time, resulting in a double release sock() and a reference count underflow via double nfc llcp sock put().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

CVE-2026-31629

ECHO-A855-D9E1-5DB9

OPENSUSE-SU-2026:10703-1

Affected Products

Linux Kernel

References · 79

• https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c · Patch
• https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf · Patch
• https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31629 · Vendor Advisory
• https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-31629 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10703-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31629 · Vendor Advisory
• https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31629 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31629 · Security Note
• https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31629 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31629 · Security Note
• https://suse.com/security/cve/CVE-2026-31627 · Note