VulnerabilityPublished 24 Apr 2026Updated 6 Nov 2026

CVE-2026-31661: Linux kernel · wifi: brcmsmac: Fix dma_free_coherent() size

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f449676bab54fea1440775c8c915dadb323fe015 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 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, 2026-11-06.

Patch

Available – fixed in f449676bab54fea1440775c8c915dadb323fe015, b27fa888e4a426a3bcf6f6ab24701d888d9bf5aa, 77263f053963dea9f3962505ac0c768853d7dc59 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 24 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 6 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 ≥ 5b435de0d786869c95d1962121af0d7df2542009, < f449676bab54fea1440775c8c915dadb323fe015	Fixed in f449676bab54fea1440775c8c915dadb323fe015
LinuxLinux	Affected ≥ 5b435de0d786869c95d1962121af0d7df2542009, < b27fa888e4a426a3bcf6f6ab24701d888d9bf5aa	Fixed in b27fa888e4a426a3bcf6f6ab24701d888d9bf5aa
LinuxLinux	Affected ≥ 5b435de0d786869c95d1962121af0d7df2542009, < 77263f053963dea9f3962505ac0c768853d7dc59	Fixed in 77263f053963dea9f3962505ac0c768853d7dc59
LinuxLinux	Affected ≥ 5b435de0d786869c95d1962121af0d7df2542009, < 12cd7632757a54ce586e36040210b1a738a0fc53	Fixed in 12cd7632757a54ce586e36040210b1a738a0fc53
LinuxLinux	Affected ≥ 5b435de0d786869c95d1962121af0d7df2542009, < 4bf41c2731a0549e21f66180ff780b1e036639ab	Fixed in 4bf41c2731a0549e21f66180ff780b1e036639ab
LinuxLinux	Affected ≥ 5b435de0d786869c95d1962121af0d7df2542009, < 3c204a0fd079fa7a867151a47d830ad1c2db5177	Fixed in 3c204a0fd079fa7a867151a47d830ad1c2db5177

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: Fix dma_free_coherent() size dma_alloc_consistent() may change the size to align it. The new size is saved in alloced. Change the free size to match the allocation size.

References

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