CVE-2026-31652
HighSummary
W jądrze systemu Linux zidentyfikowano podatność polegającą na wycieku obiektu damon_ctx w przypadku niepowodzenia funkcji damon_call(). Gdy damon_call() zakończy się błędem, obiekt damon_ctx nie jest zwalniany, co prowadzi do wycieku pamięci przy ponownym włączeniu opcji 'enabled'.
Risk Assessment
Organizacja może być narażona na problemy z zarządzaniem pamięcią, co może prowadzić do zwiększonego zużycia zasobów oraz potencjalnych awarii systemu. Długotrwałe wycieki pamięci mogą wpływać na stabilność i wydajność systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Należy również monitorować system pod kątem nieprawidłowego zachowania związanych z zarządzaniem pamięcią.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/damon/stat: deallocate damon_call() failure leaking damon_ctx damon_stat_start() always allocates the module's damon_ctx object (damon_stat_context). Meanwhile, if damon_call() in the function fails, the damon_ctx object is not deallocated. Hence, if the damon_call() is failed, and the user writes Y to “enabled” again, the previously allocated damon_ctx object is leaked. This cannot simply be fixed by deallocating the damon_ctx object when damon_call() fails. That's because damon_call() failure doesn't guarantee the kdamond main function, which accesses the damon_ctx object, is completely finished. In other words, if damon_stat_start() deallocates the damon_ctx object after damon_call() failure, the not-yet-terminated kdamond could access the freed memory (use-after-free). Fix the leak while avoiding the use-after-free by keeping returning damon_stat_start() without deallocating the damon_ctx object after da
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

