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CVE-2023-52983

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

HIGH
7.8
CVSS Score
Published: March 27, 2025 at 04:43 PM UTC
Updated: June 17, 2026 at 06:44 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v ≥ 6.0.165.15.86 ≤ v < 5.15.936.0.16 ≤ v < 6.16.1.2 ≤ v < 6.1.115.15.865533742c7cb1bc9b1f0bf401cc397d44a3a9e07a6.0.166.1.264dc8c732f5c2b406cc752e6aaa1bd5471159cab761564d93c8265f65543acf0a576b32d66bfa26a94f3d9314d67691cb21ba91c1b528f6e3c4893b22fd72bfebda3956efc4431b60ddfc0a51e03e0
Vendor states this is fixed in 511c922c5bf6c8a166bea826e702336bc2424140 (fixed)
Vendor states this is fixed in 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5 (fixed)
Vendor states this is fixed in b600de2d7d3a16f9007fad1bdae82a3951a26af2 (fixed)
Vendor states this is fixed in cb1876fc33af26d00efdd473311f1b664c77c44e (fixed)
Affected range stops below 5.15.93, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.11, so it looks safe — our inference, not a vendor statement

References (4)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/511c922c5bf6c8a166bea826e702336bc2424140
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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