CVE - CVE-2021-47646

CVE-ID
CVE-2021-47646	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: 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. [1] https://bugzilla.kernel.org/show_bug.cgi?id=214503
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/15729ff8143f8135b03988a100a19e66d7cb7ecd URL:https://git.kernel.org/stable/c/15729ff8143f8135b03988a100a19e66d7cb7ecd MISC:https://git.kernel.org/stable/c/4083925bd6dc89216d156474a8076feec904e607 URL:https://git.kernel.org/stable/c/4083925bd6dc89216d156474a8076feec904e607 MISC:https://git.kernel.org/stable/c/65d8a737452e88f251fe5d925371de6d606df613 URL:https://git.kernel.org/stable/c/65d8a737452e88f251fe5d925371de6d606df613 MISC:https://git.kernel.org/stable/c/931aff627469a75c77b9fd3823146d0575afffd6 URL:https://git.kernel.org/stable/c/931aff627469a75c77b9fd3823146d0575afffd6 MISC:https://git.kernel.org/stable/c/abc2129e646af7b43025d90a071f83043f1ae76c URL:https://git.kernel.org/stable/c/abc2129e646af7b43025d90a071f83043f1ae76c MISC:https://git.kernel.org/stable/c/cc051f497eac9d8a0d816cd4bffa3415f2724871 URL:https://git.kernel.org/stable/c/cc051f497eac9d8a0d816cd4bffa3415f2724871 MISC:https://git.kernel.org/stable/c/f990f0985eda59d4f29fc83fcf300c92b1225d39 URL:https://git.kernel.org/stable/c/f990f0985eda59d4f29fc83fcf300c92b1225d39
Assigning CNA
kernel.org
Date Record Created
20250226	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 (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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