CVE-2021-47254
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
W jądrze systemu Linux naprawiono podatność związaną z użyciem po zwolnieniu pamięci w funkcji gfs2_glock_shrink_scan. Problem dotyczył niewłaściwego zarządzania flagą GLF_LRU, co mogło prowadzić do nieprawidłowego usuwania glocków z listy LRU.
Risk Assessment
Podatność ta może prowadzić do nieprzewidzianego zachowania systemu, co w konsekwencji może wpłynąć na stabilność i bezpieczeństwo aplikacji korzystających z systemu plików GFS2.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność i zapewnić prawidłowe zarządzanie pamięcią w systemie.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

