CVE-2026-53320 (GCVE-0-2026-53320)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:41 – Updated: 2026-06-26 19:41
VLAI
Title
nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
Summary
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]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < e0a0c4903cbba351f0f5b5d104960d3a5b23202f (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < 9472d37799a0b9ff9b99639f35961ac2f0b3c9be (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < 65e07964b4b2daf9a54e686cf0fa72d74a9648a8 (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < b88f905d4449b70da6bda547be546e365e44352e (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < 4525658002be3ad310b16bf8db48c8adb6a55d32 (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < e5ff0ba4b6983cdbcc826efc201e7179ece5d46f (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < 94094e70fe292c9566502772d4d4d6d6a99204b1 (git)
Affected: 7942b919f7321f95a777d396ff7894a7a83dc9b0 , < be3e5d10643d3be1cbac9d9939f220a99253f980 (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()\n\nnilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks\nby comparing it with the current block number bd_blocknr. If they differ,\nthe block is considered dead and skipped.\n\nHowever, bd_oblocknr should never be 0 since block 0 typically stores the\nprimary superblock and is never a valid GC target block. A corrupted ioctl\nrequest with bd_oblocknr set to 0 causes the comparison to incorrectly\nmatch when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing\nthe dead block check and calling nilfs_bmap_mark() on a non-existent\nblock. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering\nthe WARN_ON(ret == -ENOENT).\n\nFix this by rejecting ioctl requests with bd_oblocknr set to 0 at the\nbeginning of each iteration.\n\n[ryusuke: slightly modified the commit message and comments for accuracy]"
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This causes nilfs_btree_do_lookup() to return -ENOENT, triggering\\nthe WARN_ON(ret == -ENOENT).\\n\\nFix this by rejecting ioctl requests with bd_oblocknr set to 0 at the\\nbeginning of each iteration.\\n\\n[ryusuke: slightly modified the commit message and comments for 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  }
}


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