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redhatcveRedhat.comRH:CVE-2021-47254
HistoryMay 23, 2024 - 2:04 p.m.

CVE-2021-47254

2024-05-2314:04:49
redhat.com
access.redhat.com
2
linux kernel
gfs2
vulnerability
cve-2021-47254
critical
resolution

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

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.

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%