Medium [CVE-2026-74646] take fl->lock when moving mmaps on interrupted invoke
This medium-severity Red Hat Linux advisory covers CVE-2026-74646.
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Summary
A flaw was found in the Linux kernel's fastrpc subsystem. When an invoke operation is interrupted by a signal, the `fastrpc_internal_invoke()` function moves memory mappings without properly holding the `fl->lock`.
This missing lock during memory map manipulation creates a race condition, which could lead to memory corruption or system instability. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-414.
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 35 minutes 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 35 minutes 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 35 minutes ago·verify at source
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