CVE-2021-47646: 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…

PriorityP338high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.28%

20.5th percentile

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

Affected

19 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.17.3-1 (bookworm)	linux 5.17.3-1 (bookworm)
linux	linux	—	—
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < f990f0985eda59d4f29fc83fcf300c92b1225d39	f990f0985eda59d4f29fc83fcf300c92b1225d39
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < 931aff627469a75c77b9fd3823146d0575afffd6	931aff627469a75c77b9fd3823146d0575afffd6
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < cc051f497eac9d8a0d816cd4bffa3415f2724871	cc051f497eac9d8a0d816cd4bffa3415f2724871
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < 65d8a737452e88f251fe5d925371de6d606df613	65d8a737452e88f251fe5d925371de6d606df613
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < abc2129e646af7b43025d90a071f83043f1ae76c	abc2129e646af7b43025d90a071f83043f1ae76c
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < 4083925bd6dc89216d156474a8076feec904e607	4083925bd6dc89216d156474a8076feec904e607
linux	linux	>= aee69d78dec0ffdf82e35d57c626e80dddc314d5 < 15729ff8143f8135b03988a100a19e66d7cb7ecd	15729ff8143f8135b03988a100a19e66d7cb7ecd
linux	linux_kernel	< 4.19.238	4.19.238
linux	linux_kernel	>= 0 < 5.10.113-1	5.10.113-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 4.20 < 5.4.189	5.4.189
linux	linux_kernel	>= 5.11 < 5.15.33	5.15.33
linux	linux_kernel	>= 5.16 < 5.16.19	5.16.19
linux	linux_kernel	>= 5.17 < 5.17.2	5.17.2
linux	linux_kernel	>= 5.5 < 5.10.110	5.10.110

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv7.8HIGH

vendor_debian7.8HIGH

vendor_redhat7.8HIGH

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