Vulnerability-Lookup

GHSA-297X-6X5C-99GQ

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

jbd2: bound shrinker scans by examined checkpoint buffers

The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget.

If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls.

Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved.

This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89567"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: bound shrinker scans by examined checkpoint buffers\n\nThe jbd2 shrinker currently accounts only checkpoint buffers that it\nsuccessfully releases against nr_to_scan.  Busy buffers therefore do not\nconsume the scan budget.\n\nIf a checkpoint transaction contains mostly busy buffers, the shrinker\ncan scan its entire checkpoint list while holding journal-\u003ej_list_lock.\nLarge checkpoint lists can result in excessive lock hold times and leave\nother CPUs spinning on j_list_lock, causing soft lockups or RCU stalls.\n\nPass nr_to_scan into journal_shrink_one_cp_list() and decrement it for\nevery buffer examined, including busy buffers.  Pass NULL from checkpoint\ncleanup paths so their existing full-list behavior is preserved.\n\nThis restores the scan-budget semantics that existed before\njournal_shrink_one_cp_list() was changed to always scan a complete\ncheckpoint list.",
  "id": "GHSA-297x-6x5c-99gq",
  "modified": "2026-09-11T21:31:32Z",
  "published": "2026-09-11T21:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89567"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89567 (GCVE-0-2026-89567)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-11 19:44

Title

jbd2: bound shrinker scans by examined checkpoint buffers

Summary

In the Linux kernel, the following vulnerability has been resolved: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/edf5fcd0469b7467b…
https://git.kernel.org/stable/c/71c6b872c746465fa…
https://git.kernel.org/stable/c/c2c0fb364685b8996…
https://git.kernel.org/stable/c/15cb16496446b94e6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < edf5fcd0469b7467bd5b37a79502c8d9c3257dbb (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < 71c6b872c746465fa4b5def239cb296173ca8216 (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < c2c0fb364685b8996c357d3b050394959b29d6e0 (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < 15cb16496446b94e67f7abcb049b8e2c75cd3d02 (git) Affected: 9c31bb2684f8035beca0275349d19d679b679ffb (git) Affected: 5fda50e262e65bd553ff777c4b280afd1495a18b (git) Affected: 557fda9ed70ebf8eda2620ba3d746215285a1303 (git) Affected: 5.15.129 , < 5.16 (semver) Affected: 6.1.50 , < 6.2 (semver) Affected: 6.4.13 , < 6.5 (semver)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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