Bug 2395351 (CVE-2022-50306)

Summary: CVE-2022-50306 kernel: ext4: fix potential out of bound read in ext4_fc_replay_scan()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-15 15:09:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ext4: fix potential out of bound read in ext4_fc_replay_scan()

For scan loop must ensure that at least EXT4_FC_TAG_BASE_LEN space. If remain
space less than EXT4_FC_TAG_BASE_LEN which will lead to out of bound read
when mounting corrupt file system image.
ADD_RANGE/HEAD/TAIL is needed to add extra check when do journal scan, as this
three tags will read data during scan, tag length couldn't less than data length
which will read.
Comment 1 Jon Moroney 2025-09-15 20:29:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091559-CVE-2022-50306-c1da@gregkh/T