Bug 2348614 (CVE-2025-21772)

Summary: CVE-2025-21772 kernel: partitions: mac: fix handling of bogus partition table
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 2025-02-27 03:05:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

partitions: mac: fix handling of bogus partition table

Fix several issues in partition probing:

 - The bailout for a bad partoffset must use put_dev_sector(), since the
   preceding read_part_sector() succeeded.
 - If the partition table claims a silly sector size like 0xfff bytes
   (which results in partition table entries straddling sector boundaries),
   bail out instead of accessing out-of-bounds memory.
 - We must not assume that the partition table contains proper NUL
   termination - use strnlen() and strncmp() instead of strlen() and
   strcmp().
Comment 1 Michal Findra 2025-02-27 20:15:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022606-CVE-2025-21772-5ec0@gregkh/T