{"apiVersion":"1.0","identifier":"CVE-2026-72068","description":"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.","publishedAt":"2026-08-15T06:21:16","lastModifiedAt":"2026-08-17T06:18:05","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72068","cvssScore":null,"cvssVector":"Pending","epssProbability":0.0022,"riskScore":0,"affectedProduct":"linux","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72068","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72068","en":"https://www.redsauce.net/en/cves/CVE-2026-72068","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72068","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72068","de":"https://www.redsauce.net/de/cves/CVE-2026-72068","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72068","el":"https://www.redsauce.net/el/cves/CVE-2026-72068"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72068"}}