PT-2026-34414 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-04-25 · CVE-2026-31509

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description A circular locking dependency exists in the NFC NCI component. The nci close device() function flushes rx wq and tx wq while holding the req lock mutex. This creates a conflict because nci rx work() running on rx wq can also attempt to acquire req lock through a sequence of calls involving nci rx data packet(), nci data exchange complete(), sk destruct(), rawsock destruct(), nfc deactivate target(), nci deactivate target(), and nci request().

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-2026-31509

ECHO-D3AA-DB7C-361A

Affected Products

Linux Kernel

References · 19

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31509 · Vendor Advisory
• https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-31509 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31509 · Security Note
• https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31509 · Vendor Advisory
• https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3 · Patch
• https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3 · Patch
• https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e · Patch
• https://ubuntu.com/security/CVE-2026-31509 · Vendor Advisory
• https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31509 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31509 · Security Note
• https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616 · Patch
• https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf · Patch