What’s Vulnerable › Vulnerabilities

CVE-2022-49413: bfq: Update cgroup information before merging bio

• 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: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: bfq: Update cgroup information before merging bio When the process is migrated to a different cgroup (or in case of writeback just starts submitting bios associated with a different cgroup) bfq_merge_bio() can operate with stale cgroup information in bic. Thus the bio can be merged to a request from a different cgroup or it can result in merging of bfqqs for different cgroups or bfqqs of already dead cgroups and causing possible use-after-free issues. Fix the problem by updating cgroup information in bfq_merge_bio().

Affected products

• Linux kernel: from 4.12 before 5.4.198; from 5.5 before 5.10.121; from 5.11 before 5.15.46; from 5.16 before 5.17.14; from 5.18 before 5.18.3 — fixed in 5.10.121, 5.15.46, 5.17.14, 5.18.3, 5.4.198

How to fix

Upgrade to a fixed version: Linux kernel 5.10.121, 5.15.46, 5.17.14, 5.18.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2a1077f17169a6059992a0bbdb330e0abad1e6d9
• https://git.kernel.org/stable/c/b06691af08b41dfd81052a3362514d9827b44bb1
• https://git.kernel.org/stable/c/d9165200c5627a2cf4408eefabdf0058bdf95e1a
• https://git.kernel.org/stable/c/da9f3025d595956410ceaab2bea01980d7775948
• https://git.kernel.org/stable/c/e8821f45612f2e6d9adb9c6ba0fb4184f57692aa
• https://git.kernel.org/stable/c/ea591cd4eb270393810e7be01feb8fde6a34fbbe

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