Answer in brief
CVE-2026-52928 records a Medium severity (CVSS 5.5) vulnerability in af_unix: Reject SIOCATMARK on non-stream sockets. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=314001f0bf927015e459c9d387d62a231fe93af3 <ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 || >=314001f0bf927015e459c9d387d62a231fe93af3 <f085971de6d6b8ef946a5e0bcd73ff24509a0f85 || >=314001f0bf927015e459c9d387d62a231fe93af3 <b741c9c6ef59f17c1f104ddf1217ef77f79ed29b || >=314001f0bf927015e459c9d387d62a231fe93af3 <645b1ed3259af38b7814242a420bc2081bdd1eb6 || >=314001f0bf927015e459c9d387d62a231fe93af3 <c34c41446acf6c0d13b5b06c809be11e0f7f2729 || >=314001f0bf927015e459c9d387d62a231fe93af3 <3147ddf5a41c20c45c2eb69e00b62f10f822056a || >=314001f0bf927015e459c9d387d62a231fe93af3 <d119775f2bad827edc28071c061fdd4a91f889a5 | ec123873fdc83e7244c8ed6d17b8f8ea6c416a67, f085971de6d6b8ef946a5e0bcd73ff24509a0f85, b741c9c6ef59f17c1f104ddf1217ef77f79ed29b, 645b1ed3259af38b7814242a420bc2081bdd1eb6, c34c41446acf6c0d13b5b06c809be11e0f7f2729, 3147ddf5a41c20c45c2eb69e00b62f10f822056a, d119775f2bad827edc28071c061fdd4a91f889a5 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.