CVE-2026-31509

MEDIUM EPSS 0.8%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix circular locking dependency in nci_close_device nci_close_device() flushes rx_wq and tx_wq while holding req_lock. This causes a circular locking dependency because nci_rx_work() running on rx_wq can end up taking req_lock too: nci_rx_work -> nci_rx_data_packet -> nci_data_exchange_complete -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_lock) Move the flush of rx_wq after req_lock has been released. This should safe (I think) because NCI_UP has already been cleared and the transport is closed, so the work will see it and return -ENETDOWN. NIPA has been hitting this running the nci selftest with a debug kernel on roughly 4% of the runs.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥3.2.1  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel3.2any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79
    Patch