CVE-2026-72068
CVE CVE-2026-72068EUVD EUVD-2026-59026Published 2026-08-15T05:52:21.000ZLast changed 2026-08-17T05:07:35.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Use u64 multiplication in update_rlimit_cpu() update_rlimit_cpu() converts the RLIMIT_CPU value to nanoseconds with u64 nsecs = rlim_new * NSEC_PER_SEC; On 32-bit kernels both rlim_new (unsigned long) and NSEC_PER_SEC (1000000000L) are 32-bit, so the multiplication is performed in unsigned long and truncated for rlim_new > 4 seconds before being widened to u64. The same file already casts to u64 for the matching computation in check_process_timers(): u64 softns = (u64)soft * NSEC_PER_SEC; As a result, the truncated value is installed into the CPUCLOCK_PROF expiry cache (nextevt), causing the process CPU timer to be programmed to fire prematurely for any RLIMIT_CPU soft limit >= 5 seconds. The actual SIGXCPU/SIGKILL decision in check_process_timers() already casts to u64 and is therefore correct, so limit enforcement is not broken; only the expiry-cache programming is wrong. Apply the same cast here so both paths convert rlim_cur identically. 64-bit kernels are unaffected.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <feb5c87c8514444ba891b75a5a3eae57c64edaf8; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <ea6a188ee805e841a0e242f14d15953e0dfa74bb; 4.11; patch: 6.12.97; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <1fafc4d9b411645eb34de43362b966dc8fb3e263; patch: 6.1.178; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <571e1f10b5996ba3e4dc63ea77de4aa309c384ce; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <edf6babb9edd2d3e19229ade339081f439d4f478; patch: 0; patch: 6.18.40; patch: 7.1.5; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <26aff38fefb1d6cd87e22525f41cc8f1aa61b24f; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <384628d6cdde0fcd76868606fad3ad8293100afb; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 <cff8281bacd2866767e6194c3079d33b6c5a74f4; patch: 5.15.212; patch: 5.10.261; patch: 7.2; patch: 6.6.145
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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