Microsoft · af_unix: Reject SIOCATMARK on non-stream sockets
Affects MicrosoftSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Security Response Center Microsoft | Affected
| Fixed in– |
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
- nvd.nist.gov/vuln/detail/CVE-2026-52928 (opens in a new tab)
- git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a (opens in a new tab)
- git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6 (opens in a new tab)
- git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b (opens in a new tab)
- git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729 (opens in a new tab)
- git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5 (opens in a new tab)
- git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 (opens in a new tab)
- git.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52928.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)