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VulnerabilityPublished Updated

CVE-2025-38727: Linux kernel · netlink: avoid infinite retry looping in netlink_unicast()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f324959ad47e62e3cadaffa65d3cff790fb48529 : patch Linux kernel soon.

Data as of 10 Nov 2026, 12:50 UTC

Severity
High

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

Thin evidence

One scorer or none
Patch
Available – fixed in f324959ad47e62e3cadaffa65d3cff790fb48529, e8edc7de688791a337c068693f22e8d8b869df71, d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e +13

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 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 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=5.4.296 <5.4.297
  • >=5.10.240 <5.10.241
  • >=5.15.189 <5.15.190
  • >=6.1.146 <6.1.149
  • >=6.6.99 <6.6.103
  • >=6.12.39 <6.12.43
  • >=6.15.7 <6.15.11
Fixed in
  • f324959ad47e62e3cadaffa65d3cff790fb48529
  • e8edc7de688791a337c068693f22e8d8b869df71
  • d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e
  • 759dfc7d04bab1b0b86113f1164dc1fec192b859
  • 346c820ef5135cf062fa3473da955ef8c5fb6929
  • 78fcd69d55c5f11d7694c547eca767a1cfd38ec4
  • 47d49fd07f86d1f55ea1083287303d237e9e0922
  • 44ddd7b1ae0b7edb2c832eb16798c827a05e58f0
  • 6bee383ff83352a693d03efdf27cdd80742f71b2
  • 6.15.11
  • 6.12.43
  • 6.6.103
  • 6.1.149
  • 5.15.190
  • 5.10.241
  • 5.4.297
LinuxLinuxAffected
  • =6.16
Fixed in–

AI-suggested

A fix is available and has been applied in multiple Linux kernel versions as listed. Users and administrators should upgrade to the fixed kernel versions to resolve this issue. No additional mitigation steps are indicated or required beyond applying the official patches.

Description

A vulnerability in the Linux kernel's netlink subsystem causes an infinite retry loop in the netlink_unicast() function due to improper memory allocation checks. This leads to a kernel stall detected by the RCU scheduler, potentially impacting system stability. The issue has been fixed by restoring the original memory check behavior in multiple Linux kernel versions.

References

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