VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-52928: Linux kernel · af_unix: Reject SIOCATMARK on non-stream sockets

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f085971de6d6b8ef946a5e0bcd73ff24509a0f85 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 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 f085971de6d6b8ef946a5e0bcd73ff24509a0f85, ec123873fdc83e7244c8ed6d17b8f8ea6c416a67, d119775f2bad827edc28071c061fdd4a91f889a5 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 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 ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < f085971de6d6b8ef946a5e0bcd73ff24509a0f85	Fixed in f085971de6d6b8ef946a5e0bcd73ff24509a0f85
LinuxLinux	Affected ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < ec123873fdc83e7244c8ed6d17b8f8ea6c416a67	Fixed in ec123873fdc83e7244c8ed6d17b8f8ea6c416a67
LinuxLinux	Affected ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < d119775f2bad827edc28071c061fdd4a91f889a5	Fixed in d119775f2bad827edc28071c061fdd4a91f889a5
LinuxLinux	Affected ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < c34c41446acf6c0d13b5b06c809be11e0f7f2729	Fixed in c34c41446acf6c0d13b5b06c809be11e0f7f2729
LinuxLinux	Affected ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < b741c9c6ef59f17c1f104ddf1217ef77f79ed29b	Fixed in b741c9c6ef59f17c1f104ddf1217ef77f79ed29b
LinuxLinux	Affected ≥ 314001f0bf927015e459c9d387d62a231fe93af3, < 3147ddf5a41c20c45c2eb69e00b62f10f822056a	Fixed in 3147ddf5a41c20c45c2eb69e00b62f10f822056a

Description

In the Linux kernel, the following vulnerability has been resolved: af_unix: Reject SIOCATMARK on non-stream sockets SIOCATMARK reports whether the receive queue is at the urgent mark for MSG_OOB. In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets. SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(), so they should not support SIOCATMARK either. Return -EOPNOTSUPP for non-stream sockets before checking the receive queue.

References

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