Bug 2347737 (CVE-2022-49168)

Summary: CVE-2022-49168 kernel: btrfs: do not clean up repair bio if submit fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:04:58 UTC 
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.
Comment 1 Avinash Hanwate 2025-02-26 21:02:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022612-CVE-2022-49168-d59d@gregkh/T