Medium severity · published Jun 24, 2026
CVE-2026-52928
af_unix: Reject SIOCATMARK on non-stream sockets
5.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.15 before 5.15.211; 5.16 before 6.1.177; 6.2 before 6.6.144; 6.7 before 6.12.88; 6.13 before 6.18.30; 6.19 before 7.0.7; +2 more · source: NVD
LI
Linux · Linux
314001f0bf927015e459c9d387d62a231fe93af3 before ec123873fdc83e7244c8ed6d17b8f8ea6c416a67; 314001f0bf927015e459c9d387d62a231fe93af3 before f085971de6d6b8ef946a5e0bcd73ff24509a0f85; 314001f0bf927015e459c9d387d62a231fe93af3 before b741c9c6ef59f17c1f104ddf1217ef77f79ed29b; 314001f0bf927015e459c9d387d62a231fe93af3 before 645b1ed3259af38b7814242a420bc2081bdd1eb6; 314001f0bf927015e459c9d387d62a231fe93af3 before c34c41446acf6c0d13b5b06c809be11e0f7f2729; 314001f0bf927015e459c9d387d62a231fe93af3 before 3147ddf5a41c20c45c2eb69e00b62f10f822056a; +2 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52928
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52928
Patch
https://git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a
Patch
https://git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6
Patch
https://git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b
Patch
https://git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729
Patch
https://git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5
Patch
https://git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67
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