CVE-2026-64415 (GCVE-0-2026-64415)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup We hit a real softlockup in an internal stress test environment. The workload was LTP memory/swap stress on a large arm64 machine, with 320 CPUs, about 1TB memory and an 8.6GB swap device. The system was under heavy load and the swap device had a large number of full clusters. The softlockup was triggered during a stress test after about 3 days. So, add periodic cond_resched() calls during large full_clusters reclaim operations to prevent softlockup issues. Detailed call trace as follow: PID: 3817773 TASK: ffff0883bb28b780 CPU: 48 COMMAND: "kworker/48:7" #0 [ffff800080183d10] __crash_kexec at ffffa4c1361e5de4 #1 [ffff800080183d90] panic at ffffa4c1360d5e9c #2 [ffff800080183e20] watchdog_timer_fn at ffffa4c136231fa8 ... #16 [ffff8000c4ad3cb0] swap_cache_del_folio at ffffa4c1363e1614 #17 [ffff8000c4ad3ce0] __try_to_reclaim_swap at ffffa4c1363e4bfc #18 [ffff8000c4ad3d40] swap_reclaim_full_clusters at ffffa4c1363e5474 #19 [ffff8000c4ad3da0] swap_reclaim_work at ffffa4c1363e550c #20 [ffff8000c4ad3dc0] process_one_work at ffffa4c136102edc #21 [ffff8000c4ad3e10] worker_thread at ffffa4c136103398 #22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c
References
Impacted products
Vendor Product Version
Linux Linux Version: 5168a68eb78fa1c67a8b2d31d0642c7fd866cc12
Version: 5168a68eb78fa1c67a8b2d31d0642c7fd866cc12
Version: 5168a68eb78fa1c67a8b2d31d0642c7fd866cc12
Version: 5168a68eb78fa1c67a8b2d31d0642c7fd866cc12
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/swapfile.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "60cbe67d1342f34b66df1c2ee328e3cd333767d7",
              "status": "affected",
              "version": "5168a68eb78fa1c67a8b2d31d0642c7fd866cc12",
              "versionType": "git"
            },
            {
              "lessThan": "69c0e6246575b780ae0d3f411c749bcf13c221f3",
              "status": "affected",
              "version": "5168a68eb78fa1c67a8b2d31d0642c7fd866cc12",
              "versionType": "git"
            },
            {
              "lessThan": "2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0",
              "status": "affected",
              "version": "5168a68eb78fa1c67a8b2d31d0642c7fd866cc12",
              "versionType": "git"
            },
            {
              "lessThan": "66366d291f666ddeda5f8c84f253e308de3e6b55",
              "status": "affected",
              "version": "5168a68eb78fa1c67a8b2d31d0642c7fd866cc12",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/swapfile.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup\n\nWe hit a real softlockup in an internal stress test environment.  The\nworkload was LTP memory/swap stress on a large arm64 machine, with 320\nCPUs, about 1TB memory and an 8.6GB swap device.  The system was under\nheavy load and the swap device had a large number of full clusters.  The\nsoftlockup was triggered during a stress test after about 3 days.\n\nSo, add periodic cond_resched() calls during large full_clusters\nreclaim operations to prevent softlockup issues.\n\nDetailed call trace as follow:\n\nPID: 3817773  TASK: ffff0883bb28b780  CPU: 48   COMMAND: \"kworker/48:7\"\n   #0 [ffff800080183d10] __crash_kexec at ffffa4c1361e5de4\n   #1 [ffff800080183d90] panic at ffffa4c1360d5e9c\n   #2 [ffff800080183e20] watchdog_timer_fn at ffffa4c136231fa8\n   ...\n  #16 [ffff8000c4ad3cb0] swap_cache_del_folio at ffffa4c1363e1614\n  #17 [ffff8000c4ad3ce0] __try_to_reclaim_swap at ffffa4c1363e4bfc\n  #18 [ffff8000c4ad3d40] swap_reclaim_full_clusters at ffffa4c1363e5474\n  #19 [ffff8000c4ad3da0] swap_reclaim_work at ffffa4c1363e550c\n  #20 [ffff8000c4ad3dc0] process_one_work at ffffa4c136102edc\n  #21 [ffff8000c4ad3e10] worker_thread at ffffa4c136103398\n  #22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:14.532Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/60cbe67d1342f34b66df1c2ee328e3cd333767d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/69c0e6246575b780ae0d3f411c749bcf13c221f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/66366d291f666ddeda5f8c84f253e308de3e6b55"
        }
      ],
      "title": "mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64415",
    "datePublished": "2026-07-25T08:50:55.226Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-08-17T04:55:14.532Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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