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jbd2: bound shrinker scans by examined checkpoint buffers

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.12.109, 6.18.50, 6.6.160, 7.2.4
CVEs
CVE-2026-89567
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 04:07 UTC · Revision 1

Source evidence

jbd2: bound shrinker scans by examined checkpoint buffers

core-osv · Original source

Published 11 Sept 2026, 19:44 UTC

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.

osv:CVE-2026-89567

Kernel

Fixed versions: 6.6.160, 6.12.109, 6.18.50, 7.2.4

Complete source record
{
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  "url": "https://osv.dev/vulnerability/CVE-2026-89567",
  "method": "structured",
  "payload": {
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    "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.",
    "evidence": "osv:CVE-2026-89567",
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      "modified": "2026-10-28T02:30:33.097412871Z",
      "provider": "osv",
      "references": [
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  "source_id": "core-osv",
  "document_id": 500235,
  "published_at": "2026-09-11T19:44:37.332+00:00"
}