High [CVE-2026-74434] Don't move a peeked OOB message onto the pending queue
This high-severity Red Hat Linux advisory covers CVE-2026-74434 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
A flaw was found in the Linux kernel's rxrpc subsystem. When an out-of-band (OOB) message is read using the MSG_PEEK flag in the rxrpc_recvmsg_oob() function, the message is incorrectly left on one queue while also being added to another.
This can lead to the message being freed twice when the socket is closed, resulting in memory corruption and a use-after-free vulnerability. A local attacker could exploit this to cause system instability or potentially execute arbitrary code.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-1341.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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