Medium [CVE-2026-72068] Use u64 multiplication in update_rlimit_cpu
This medium-severity Red Hat Linux advisory covers CVE-2026-72068 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel's `posix-cpu-timers` component on 32-bit systems. An integer truncation vulnerability occurs in the `update_rlimit_cpu()` function when converting the `RLIMIT_CPU` value to nanoseconds.
This issue causes the process CPU timer to be programmed to fire prematurely for `RLIMIT_CPU` soft limits of 5 seconds or more. While actual resource limit enforcement remains correct, this premature timer expiry could lead to a denial of service for affected processes.
Red Hat severity: Low — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-190.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
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 3 hours 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 3 hours 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 3 hours ago·verify at source
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