What’s Vulnerable › Vulnerabilities

CVE-2023-52983: block, bfq: fix uaf for bfqq in bic_set_bfqq()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-27 · updated 2026-06-17
• Weakness: CWE-416

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 products

• Linux kernel: from 5.15.86 before 5.15.93; from 6.1.2 before 6.1.11; 6.0.16 — fixed in 5.15.93, 6.1.11

How to fix

Upgrade to a fixed version: Linux kernel 5.15.93, 6.1.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/511c922c5bf6c8a166bea826e702336bc2424140
• https://git.kernel.org/stable/c/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
• https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2
• https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e

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