Use After Free The advisory has been revoked - it doesn't affect any version of package rtla (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL9-RTLA-9059104
- published5 Mar 2025
- disclosed26 Feb 2025
Introduced: 26 Feb 2025
CVE-2021-47646 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:9.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rtla package and not the rtla package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
Revert "Revert "block, bfq: honor already-setup queue merges""
A crash [1] happened to be triggered in conjunction with commit 2d52c58b9c9b ("block, bfq: honor already-setup queue merges"). The latter was then reverted by commit ebc69e897e17 ("Revert "block, bfq: honor already-setup queue merges""). Yet, the reverted commit was not the one introducing the bug. In fact, it actually triggered a UAF introduced by a different commit, and now fixed by commit d29bd41428cf ("block, bfq: reset last_bfqq_created on group change").
So, there is no point in keeping commit 2d52c58b9c9b ("block, bfq: honor already-setup queue merges") out. This commit restores it.
References
- https://access.redhat.com/security/cve/CVE-2021-47646
- https://git.kernel.org/stable/c/15729ff8143f8135b03988a100a19e66d7cb7ecd
- https://git.kernel.org/stable/c/4083925bd6dc89216d156474a8076feec904e607
- https://git.kernel.org/stable/c/65d8a737452e88f251fe5d925371de6d606df613
- https://git.kernel.org/stable/c/931aff627469a75c77b9fd3823146d0575afffd6
- https://git.kernel.org/stable/c/abc2129e646af7b43025d90a071f83043f1ae76c
- https://git.kernel.org/stable/c/cc051f497eac9d8a0d816cd4bffa3415f2724871
- https://git.kernel.org/stable/c/f990f0985eda59d4f29fc83fcf300c92b1225d39