CVE-2021-47254
Linux Kernel gfs2 Use-after-free
Description
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
May 21, 2024, 4:54 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2021-47254
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CVE-2021-47254
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CVE-2021-47254
vulnerability over time.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47254
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47254
weaknesses.