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VulnerabilityPublished Updated

CVE-2026-31515: Linux kernel · af_key: validate families in pfkey_send_migrate()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ee836e820a40e2ca4da8af7310bff92d586772d4 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 22:18 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 ee836e820a40e2ca4da8af7310bff92d586772d4, eb2d16a7d599dc9d4df391b5e660df9949963786, e06b596fc4eb01936a2e5dccad17c946d660bab8 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Apr 2026

  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
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < ee836e820a40e2ca4da8af7310bff92d586772d4
Fixed in
  • ee836e820a40e2ca4da8af7310bff92d586772d4
LinuxLinuxAffected
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < eb2d16a7d599dc9d4df391b5e660df9949963786
Fixed in
  • eb2d16a7d599dc9d4df391b5e660df9949963786
LinuxLinuxAffected
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < e06b596fc4eb01936a2e5dccad17c946d660bab8
Fixed in
  • e06b596fc4eb01936a2e5dccad17c946d660bab8
LinuxLinuxAffected
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < d3225e6b9bd51ec177970a628fe4b11237ce87d5
Fixed in
  • d3225e6b9bd51ec177970a628fe4b11237ce87d5
LinuxLinuxAffected
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < d0c5aa8dd38887714f1aad04236a3620b56a5e4e
Fixed in
  • d0c5aa8dd38887714f1aad04236a3620b56a5e4e
LinuxLinuxAffected
  • ≥ 08de61beab8a21c8e0b3906a97defda5f1f66ece, < 83f644ea92987c100b82d8481ae2230faeed3d34
Fixed in
  • 83f644ea92987c100b82d8481ae2230faeed3d34

AI-suggested

A fix is available in the Linux kernel as indicated by multiple fixed commit versions. Users should update to a kernel version that includes these fixes to mitigate the vulnerability.

Description

A vulnerability in the Linux kernel's af_key module was fixed by validating address families early in the pfkey_send_migrate() function. The issue involved improper checks on old and new families and a truncated argument in set_ipsecrequest(), which could cause an skb buffer overflow and kernel crash.

References

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