CVE-2026-89566 (GCVE-0-2026-89566)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-21 12:47
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: b98dba273a0e47dbfade89c9af73c5b012a4eabb
Version: b98dba273a0e47dbfade89c9af73c5b012a4eabb
Version: b98dba273a0e47dbfade89c9af73c5b012a4eabb
Version: b98dba273a0e47dbfade89c9af73c5b012a4eabb
Version: b98dba273a0e47dbfade89c9af73c5b012a4eabb
Version: 9c31bb2684f8035beca0275349d19d679b679ffb
Version: 5fda50e262e65bd553ff777c4b280afd1495a18b
Version: 557fda9ed70ebf8eda2620ba3d746215285a1303
Version: 5.15.129   ≤
Version: 6.1.50   ≤
Version: 6.4.13   ≤
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{
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:47:53.628Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dc7ece0b827fe3b748db685fb85cd2fc3710c3f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c"
        },
        {
          "url": "https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0"
        }
      ],
      "title": "jbd2: check need_resched() when skipping busy checkpoint buffers",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89566",
    "datePublished": "2026-09-11T19:44:36.599Z",
    "dateReserved": "2026-09-11T19:38:34.726Z",
    "dateUpdated": "2026-10-21T12:47:53.628Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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