What’s Vulnerable › Vulnerabilities

CVE-2022-50329: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-15 · updated 2026-10-15
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().

Affected products

• Linux kernel: 5.15.86, 6.0.16, 6.1.2, 6.2-rc1

References

• https://git.kernel.org/stable/c/1425f1bb5df5239021fd09ebc2a5e8070e705d36
• https://git.kernel.org/stable/c/1ed959fef5b1c6f1a7a3fbea543698c30ebd6678
• https://git.kernel.org/stable/c/246cf66e300b76099b5dbd3fdd39e9a5dbc53f02
• https://git.kernel.org/stable/c/7949b0df3dd9f4817ed4a4e989fa9ee81df6205f
• https://git.kernel.org/stable/c/cfe5b38c37720313eff0dec5517442c7ab3c9a20

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