CVE-2021-47254
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47254
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47254.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47254
- Related
- Published
- 2024-05-21T15:15:14Z
- Modified
- 2024-09-18T01:00:20Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
gfs2: Fix use-after-free in gfs2glockshrink_scan
The GLFLRU flag is checked under lrulock in gfs2glockremovefromlru() to remove the glock from the lru list in _gfs2glock_put().
On the shrink scan path, the same flag is cleared under lrulock but because of condreschedlock(&lrulock) in gfs2disposeglock_lru(), progress on the put side can be made without deleting the glock from the lru list.
Keep GLFLRU across the race window opened by condreschedlock(&lrulock) to ensure correct behavior on both sides - clear GLFLRU after listdel under lru_lock.
- References
-
- https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595
- https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4
- https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2
- https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4
- https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d
- https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a
- https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c
- https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553
- https://security-tracker.debian.org/tracker/CVE-2021-47254
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source