CVE - CVE-2021-47254

CVE-ID
CVE-2021-47254	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 URL:https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 MISC:https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 URL:https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 MISC:https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 URL:https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 MISC:https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 URL:https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 MISC:https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d URL:https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d MISC:https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a URL:https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a MISC:https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c URL:https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c MISC:https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 URL:https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553
Assigning CNA
kernel.org
Date Record Created
20240410	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240410)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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