nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()

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Summary

CVECVE-2026-53320
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 20:17:25 UTC
Updated2026-07-06 20:12:14 UTC
DescriptionIn 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]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001730000 probability, percentile 0.069080000 (date 2026-07-04)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 e0a0c4903cbba351f0f5b5d104960d3a5b23202f git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 9472d37799a0b9ff9b99639f35961ac2f0b3c9be git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 65e07964b4b2daf9a54e686cf0fa72d74a9648a8 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 b88f905d4449b70da6bda547be546e365e44352e git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 4525658002be3ad310b16bf8db48c8adb6a55d32 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 e5ff0ba4b6983cdbcc826efc201e7179ece5d46f git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 94094e70fe292c9566502772d4d4d6d6a99204b1 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 be3e5d10643d3be1cbac9d9939f220a99253f980 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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