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VulnerabilityPublished Updated

CVE-2025-39724: Linux kernel · serial: 8250: fix panic due to PSLVERR

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in cb7b3633ed749db8e56f475f43c960652cbd6882 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:48 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch
Available – fixed in cb7b3633ed749db8e56f475f43c960652cbd6882, c826943abf473a3f7260fbadfad65e44db475460, b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 +7

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=3.10.48 <3.11
  • >=3.12.24 <3.13
Fixed in
  • cb7b3633ed749db8e56f475f43c960652cbd6882
  • c826943abf473a3f7260fbadfad65e44db475460
  • b8ca8e3f75ede308b4d49a6ca5081460be01bdb5
  • 68c4613e89f000e8198f9ace643082c697921c9f
  • 38c0ea484dedb58cb3a4391229933e16be0d1031
  • 8e2739478c164147d0774802008528d9e03fb802
  • 7f8fdd4dbffc05982b96caf586f77a014b2a9353
  • 3.13
  • 3.11
  • 0b882f00655afefbc7729c6b5aec86f7a5473a3d
LinuxLinuxAffected
  • =3.13
Fixed in–

AI-suggested

This issue is fixed in Linux kernel versions 3.11, 3.13, and corresponding commits. Users should upgrade to these fixed versions or later to remediate the vulnerability. No additional mitigation is required once patched.

Description

A vulnerability in the Linux kernel's serial 8250 driver could cause a kernel panic due to an error response triggered when reading an empty Receive Buffer Register (RBR) with FIFO enabled. The issue arises from a race condition involving concurrent UART access across CPUs, leading to a panic. The flaw is fixed by adding a lock around the UART line control register write operation.

References

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