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]

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References
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https://git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32 cve-icon
https://git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8 cve-icon
https://git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1 cve-icon
https://git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be cve-icon
https://git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e cve-icon
https://git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980 cve-icon
https://git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f cve-icon
https://git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f cve-icon
History

Fri, 26 Jun 2026 22:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Fri, 26 Jun 2026 20:15:00 +0000

Type Values Removed Values Added
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]
Title nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-26T19:41:11.932Z

Reserved: 2026-06-09T07:44:35.398Z

Link: CVE-2026-53320

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-26T22:30:04Z