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GHSA-P6JX-2FV3-6J26

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: check need_resched() when skipping busy checkpoint buffers

journal_shrink_one_cp_list() skips busy checkpoint buffers when called with JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also skips the need_resched() check at the end of the loop body.

Consequently, when a checkpoint list contains mostly busy buffers, the shrinker can walk the entire list while holding journal->j_list_lock, even when a reschedule has been requested. Large checkpoint lists under memory pressure can therefore cause long lock hold times and leave other CPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls.

Route the busy-buffer path through the need_resched() check so that the shrinker can release j_list_lock and reschedule promptly, restoring parity with the clean-buffer path, which already checks need_resched(). This does not change which checkpoint buffers are eligible for removal.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89566"
  ],
  "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: check need_resched() when skipping busy checkpoint buffers\n\njournal_shrink_one_cp_list() skips busy checkpoint buffers when called\nwith JBD2_SHRINK_BUSY_SKIP.  The continue statement on this path also\nskips the need_resched() check at the end of the loop body.\n\nConsequently, when a checkpoint list contains mostly busy buffers, the\nshrinker can walk the entire list while holding journal-\u003ej_list_lock,\neven when a reschedule has been requested.  Large checkpoint lists under\nmemory pressure can therefore cause long lock hold times and leave other\nCPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls.\n\nRoute the busy-buffer path through the need_resched() check so that the\nshrinker can release j_list_lock and reschedule promptly, restoring\nparity with the clean-buffer path, which already checks need_resched().\nThis does not change which checkpoint buffers are eligible for removal.",
  "id": "GHSA-p6jx-2fv3-6j26",
  "modified": "2026-09-11T21:31:32Z",
  "published": "2026-09-11T21:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89566"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89566 (GCVE-0-2026-89566)

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

Title

jbd2: check need_resched() when skipping busy checkpoint buffers

Summary

In the Linux kernel, the following vulnerability has been resolved: jbd2: check need_resched() when skipping busy checkpoint buffers journal_shrink_one_cp_list() skips busy checkpoint buffers when called with JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also skips the need_resched() check at the end of the loop body. Consequently, when a checkpoint list contains mostly busy buffers, the shrinker can walk the entire list while holding journal->j_list_lock, even when a reschedule has been requested. Large checkpoint lists under memory pressure can therefore cause long lock hold times and leave other CPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls. Route the busy-buffer path through the need_resched() check so that the shrinker can release j_list_lock and reschedule promptly, restoring parity with the clean-buffer path, which already checks need_resched(). This does not change which checkpoint buffers are eligible for removal.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/f83c23286e54180cd…
https://git.kernel.org/stable/c/f9182a85991a0ad5c…
https://git.kernel.org/stable/c/595cac7f1b32d009b…
https://git.kernel.org/stable/c/f213e12ff5c9590b1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < f83c23286e54180cdc83a36463a60003534cc290 (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < f9182a85991a0ad5cd2940df6db75f40ad90028c (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4 (git) Affected: b98dba273a0e47dbfade89c9af73c5b012a4eabb , < f213e12ff5c9590b1034ae8da0e6d09665c772d0 (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.

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