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jbd2: check need_resched() when skipping busy checkpoint buffers

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89566

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89566

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
        "lessThan": "dc7ece0b827fe3b748db685fb85cd2fc3710c3f9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
        "lessThan": "f83c23286e54180cdc83a36463a60003534cc290",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
        "lessThan": "f9182a85991a0ad5cd2940df6db75f40ad90028c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
        "lessThan": "595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
        "lessThan": "f213e12ff5c9590b1034ae8da0e6d09665c772d0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9c31bb2684f8035beca0275349d19d679b679ffb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5fda50e262e65bd553ff777c4b280afd1495a18b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "557fda9ed70ebf8eda2620ba3d746215285a1303",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.129",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.50",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.4.13",
        "lessThan": "6.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/jbd2/checkpoint.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/jbd2/checkpoint.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89566

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#46681 · Revision 1
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Publisher date
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