VulnerabilityPublished 13 Apr 2026Updated 5 Nov 2026

CVE-2026-31416: Linux kernel · netfilter: nfnetlink_log: account for netlink header size

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f08ffa3e1c8e36b6131f69c5eb23700c28cbd262 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 22:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

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 f08ffa3e1c8e36b6131f69c5eb23700c28cbd262, 607245c4dbb86d9a10dd8388da0fb82170a99b61, 09883bf257f4243ed5a1fd35078ec6f0d0f3696a +9

Exploitation evidence

Disclosed: evidence found.
CVE published 13 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=3.10.61 <3.11 >=3.12.34 <3.13 >=3.14.25 <3.15 >=3.17.4 <3.18	Fixed in f08ffa3e1c8e36b6131f69c5eb23700c28cbd262 607245c4dbb86d9a10dd8388da0fb82170a99b61 09883bf257f4243ed5a1fd35078ec6f0d0f3696a 761b45c661af48da6a065868d59ab1e1f64fd9b6 88a8f56e6276f616baad4274c6b8e4683e26e520 6d52a4a0520a6696bdde51caa11f2d6821cd0c01 6b419700e459fbf707ca1543b7c1b57a60fedb73 4ec216410fac9de83c99177a160ebb8d42fad075 3.18 3.15 3.13 3.11
LinuxLinux	Affected =3.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: account for netlink header size This is a followup to an old bug fix: NLMSG_DONE needs to account for the netlink header size, not just the attribute size. This can result in a WARN splat + drop of the netlink message, but other than this there are no ill effects.

References

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