CVE-2022-49168: btrfs: do not clean up repair bio if submit fails

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: btrfs: do not clean up repair bio if submit fails The submit helper will always run bio_endio() on the bio if it fails to submit, so cleaning up the bio just leads to a variety of use-after-free and NULL pointer dereference bugs because we race with the endio function that is cleaning up the bio. Instead just return BLK_STS_OK as the repair function has to continue to process the rest of the pages, and the endio for the repair bio will do the appropriate cleanup for the page that it was given.

Affected products

Linux kernel: before 5.10.248; from 5.11 before 5.15.184; from 5.16 before 5.16.19; from 5.17 before 5.17.2 — fixed in 5.10.248, 5.15.184, 5.16.19, 5.17.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.248, 5.15.184, 5.16.19, 5.17.2. Check the vendor advisory for mitigations.

References

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