CVE-2023-52983

block, bfq: fix uaf for bfqq in bic_set_bfqq()

State: Published
Severity: 7.8 High
Published: Mar 27, 2025
Updated: Aug 5, 2026
Reserved: Mar 27, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

block, bfq: fix uaf for bfqq in bic_set_bfqq()

After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"), bic->bfqq will be accessed in bic_set_bfqq(), however, in some context bic->bfqq will be freed, and bic_set_bfqq() is called with the freed bic->bfqq.

Fix the problem by always freeing bfqq after bic_set_bfqq().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a to before 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5Affected 094f3d9314d67691cb21ba091c1b528f6e3c4893 to before 511c922c5bf6c8a166bea826e702336bc2424140Affected 761564d93c8265f65543acf0a576b32d66bfa26a to before cb1876fc33af26d00efdd473311f1b664c77c44eAffected 64dc8c732f5c2b406cc752e6aaa1bd5471159cab to before b600de2d7d3a16f9007fad1bdae82a3951a26af2Affected b22fd72bfebda3956efc4431b60ddfc0a51e03e0Affected 6.0.16 to before 6.1Affected
LinuxLinux	5.15.86 to before 5.15.93Affected 6.1.2 to before 6.1.11Affected

Product

Versions

LinuxLinux

5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a to before 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5Affected
094f3d9314d67691cb21ba091c1b528f6e3c4893 to before 511c922c5bf6c8a166bea826e702336bc2424140Affected
761564d93c8265f65543acf0a576b32d66bfa26a to before cb1876fc33af26d00efdd473311f1b664c77c44eAffected
64dc8c732f5c2b406cc752e6aaa1bd5471159cab to before b600de2d7d3a16f9007fad1bdae82a3951a26af2Affected
b22fd72bfebda3956efc4431b60ddfc0a51e03e0Affected
6.0.16 to before 6.1Affected

LinuxLinux

5.15.86 to before 5.15.93Affected
6.1.2 to before 6.1.11Affected

References

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