Bug 2426156 (CVE-2022-50839)

Summary: CVE-2022-50839 kernel: jbd2: fix potential buffer head reference count leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-30 13:12:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

jbd2: fix potential buffer head reference count leak

As in 'jbd2_fc_wait_bufs' if buffer isn't uptodate, will return -EIO without
update 'journal->j_fc_off'. But 'jbd2_fc_release_bufs' will release buffer head
from ‘j_fc_off - 1’ if 'bh' is NULL will terminal release which will lead to
buffer head buffer head reference count leak.
To solve above issue, update 'journal->j_fc_off' before return -EIO.
Comment 1 Alexander B 2025-12-31 05:06:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123019-CVE-2022-50839-eca8@gregkh/T