Bug 2355448 (CVE-2023-52979)

Summary: CVE-2023-52979 kernel: squashfs: harden sanity check in squashfs_read_xattr_id_table
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2025-03-27 17:02:00 UTC 
In the Linux kernel, the following vulnerability has been resolved:

squashfs: harden sanity check in squashfs_read_xattr_id_table

While mounting a corrupted filesystem, a signed integer '*xattr_ids' can
become less than zero.  This leads to the incorrect computation of 'len'
and 'indexes' values which can cause null-ptr-deref in copy_bio_to_actor()
or out-of-bounds accesses in the next sanity checks inside
squashfs_read_xattr_id_table().

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Comment 1 Robb Gatica 2025-03-28 00:49:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032705-CVE-2023-52979-ca3f@gregkh/T
Comment 2 Avinash Hanwate 2025-03-28 05:50:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032705-CVE-2023-52979-ca3f@gregkh/T