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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-53320

nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty() nilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks by comparing it with the current block number bd_blocknr. If they differ, the block is considered dead and skipped. However, bd_oblocknr should never be 0 since block 0 typically stores the primary superblock and is never a valid GC target block. A corrupted ioctl request with bd_oblocknr set to 0 causes the comparison to incorrectly match when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing the dead block check and calling nilfs_bmap_mark() on a non-existent block. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering the WARN_ON(ret == -ENOENT). Fix this by rejecting ioctl requests with bd_oblocknr set to 0 at the beginning of each iteration. [ryusuke: slightly modified the commit message and comments for accuracy]

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

  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < e0a0c4903cbba351f0f5b5d104960d3a5b23202faffected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 9472d37799a0b9ff9b99639f35961ac2f0b3c9beaffected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 65e07964b4b2daf9a54e686cf0fa72d74a9648a8affected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < b88f905d4449b70da6bda547be546e365e44352eaffected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 4525658002be3ad310b16bf8db48c8adb6a55d32affected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < e5ff0ba4b6983cdbcc826efc201e7179ece5d46faffected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 94094e70fe292c9566502772d4d4d6d6a99204b1affected
  • 7942b919f7321f95a777d396ff7894a7a83dc9b0 to < be3e5d10643d3be1cbac9d9939f220a99253f980affected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.141 to ≤ 6.6.*unaffected
  • 6.12.91 to ≤ 6.12.*unaffected
  • 6.18.33 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References