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CVE-2023-52787: blk-mq: make sure active queue usage is held for bio_integrity_prep()

• Severity: medium (CVSS 5.5 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: 2024-05-21 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: blk-mq: make sure active queue usage is held for bio_integrity_prep() blk_integrity_unregister() can come if queue usage counter isn't held for one bio with integrity prepared, so this request may be completed with calling profile->complete_fn, then kernel panic. Another constraint is that bio_integrity_prep() needs to be called before bio merge. Fix the issue by: - call bio_integrity_prep() with one queue usage counter grabbed reliably - call bio_integrity_prep() before bio merge

Affected products

• Linux kernel: from 5.16 before 6.1.72; from 6.2 before 6.5.13; from 6.6 before 6.6.3; 6.7-rc1 — fixed in 6.1.72, 6.5.13, 6.6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.1.72, 6.5.13, 6.6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/b0077e269f6c152e807fdac90b58caf012cdbaab
• https://git.kernel.org/stable/c/b5c8e0ff76d10f6bf70a7237678f27c20cf59bc9
• https://git.kernel.org/stable/c/b80056bd75a16e4550873ecefe12bc8fd190b1cf
• https://git.kernel.org/stable/c/e9c309ded295b7f8849097d71ae231456ca79f78
• https://git.kernel.org/stable/c/b0077e269f6c152e807fdac90b58caf012cdbaab
• https://git.kernel.org/stable/c/b5c8e0ff76d10f6bf70a7237678f27c20cf59bc9
• https://git.kernel.org/stable/c/b80056bd75a16e4550873ecefe12bc8fd190b1cf
• https://git.kernel.org/stable/c/e9c309ded295b7f8849097d71ae231456ca79f78

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