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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2025-40307

exfat: validate cluster allocation bits of the allocation bitmap

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: exfat: validate cluster allocation bits of the allocation bitmap syzbot created an exfat image with cluster bits not set for the allocation bitmap. exfat-fs reads and uses the allocation bitmap without checking this. The problem is that if the start cluster of the allocation bitmap is 6, cluster 6 can be allocated when creating a directory with mkdir. exfat zeros out this cluster in exfat_mkdir, which can delete existing entries. This can reallocate the allocated entries. In addition, the allocation bitmap is also zeroed out, so cluster 6 can be reallocated. This patch adds exfat_test_bitmap_range to validate that clusters used for the allocation bitmap are correctly marked as in-use.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 to < 87f827d53bd0688597bda63ae95908e2ad39bac0affected
  • 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 to < 67ce8034dc0278ddd88cad93d4218a945180ddddaffected
  • 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 to < 6bc58b4c53795ab5fe00648344aa7d9d61175f90affected
  • 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 to < 13c1d24803d5b0446b3f6f0fdd67e07ac1fdc7bfaffected
  • 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 to < 79c1587b6cda74deb0c86fc7ba194b92958c793caffected

Linux Linux

Default version status: affected

  • 5.7affected
  • 0 to < 5.7unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.58 to ≤ 6.12.*unaffected
  • 6.17.8 to ≤ 6.17.*unaffected
  • 6.18 to ≤ *unaffected

References