CVE-2026-31515: Linux kernel · af_key: validate families in pfkey_send_migrate()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ee836e820a40e2ca4da8af7310bff92d586772d4 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:18 UTC
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
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/d0c5aa8dd38887714f1aad04236a3620b56a5e4e (opens in a new tab)
- git.kernel.org/stable/c/e06b596fc4eb01936a2e5dccad17c946d660bab8 (opens in a new tab)
- git.kernel.org/stable/c/8ddf8de7e758f6888988467af9ffc8adf589fb16 (opens in a new tab)
- git.kernel.org/stable/c/d3225e6b9bd51ec177970a628fe4b11237ce87d5 (opens in a new tab)
- git.kernel.org/stable/c/7b18692c59afb8e5c364c8e3ac01e51dd6b52028 (opens in a new tab)
- git.kernel.org/stable/c/83f644ea92987c100b82d8481ae2230faeed3d34 (opens in a new tab)
- git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4 (opens in a new tab)
- git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)