CVE-2026-72068: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди feb5c87c8514444ba891b75a5a3eae57c64edaf8; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди 384628d6cdde0fcd76868606fad3ad8293100afb; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди 1fafc4d9b411645eb34de43362b966dc8fb3e263; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди cff8281bacd2866767e6194c3079d33b6c5a74f4; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди edf6babb9edd2d3e19229ade339081f439d4f478; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди ea6a188ee805e841a0e242f14d15953e0dfa74bb; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди 571e1f10b5996ba3e4dc63ea77de4aa309c384ce; 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 преди 26aff38fefb1d6cd87e22525f41cc8f1aa61b24f
• Linux Linux: 4.11; преди 4.11; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; 7.2 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-72068
• https://nvd.nist.gov/vuln/detail/CVE-2026-72068
• https://git.kernel.org/stable/c/feb5c87c8514444ba891b75a5a3eae57c64edaf8
• https://git.kernel.org/stable/c/384628d6cdde0fcd76868606fad3ad8293100afb
• https://git.kernel.org/stable/c/1fafc4d9b411645eb34de43362b966dc8fb3e263
• https://git.kernel.org/stable/c/cff8281bacd2866767e6194c3079d33b6c5a74f4
• https://git.kernel.org/stable/c/edf6babb9edd2d3e19229ade339081f439d4f478
• https://git.kernel.org/stable/c/ea6a188ee805e841a0e242f14d15953e0dfa74bb
• https://git.kernel.org/stable/c/571e1f10b5996ba3e4dc63ea77de4aa309c384ce
• https://git.kernel.org/stable/c/26aff38fefb1d6cd87e22525f41cc8f1aa61b24f