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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 CPE status
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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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 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    "redhat_vex": {
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53320.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:03:58Z",
      "cve": "CVE-2026-53320",
      "id": "CVE-2026-53320",
      "initial_release_date": "2026-06-28T01:08:26Z",
      "product_status:known_affected": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53320",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53320.json",
      "version": "5"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.