CVE-2026-64425 (GCVE-0-2026-64425)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item commit 10dc95939817 ("io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop") fixed the obvious case where io_worker_handle_work() took one exit-bit snapshot before draining pending work, but the fix stops one level too early. io_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work run loop, yet it still snapshots that bit once before processing a whole dependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT after the first linked item has started, the remaining linked items can still reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue running after exit has begun. Move the check further inside, so it covers linked items too. Note: this is a syzbot special as it loves setting up tons of slow linked work on weird devices like msr that take forever to read, and immediately close the ring. Exit then takes a long time.
References
Impacted products
Vendor Product Version
Linux Linux Version: 065dd936195a3466b8ebe5f9287400987ee3c063
Version: 27e47500fac23d15b7dc93ff650bc4844d2581bd
Version: d05d99573f81a091547b1778b9a50120f5d6c68a
Version: 85eb83694a91c89d9abe615d717c0053c3efa714
Version: 2e8ca1078b14142db2ce51cbd18ff9971560046b
Version: bdf0bf73006ea8af9327cdb85cfdff4c23a5f966
Version: 10dc959398175736e495f71c771f8641e1ca1907
Version: 10dc959398175736e495f71c771f8641e1ca1907
Version: 5.10.253   ≤
Version: 5.15.203   ≤
Version: 6.1.167   ≤
Version: 6.6.122   ≤
Version: 6.12.68   ≤
Version: 6.18.8   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io-wq.c"
          ],
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              "status": "affected",
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              "status": "affected",
              "version": "6.18.8",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io-wq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
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            },
            {
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
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            },
            {
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              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
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                  "vulnerable": true
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item\n\ncommit 10dc95939817 (\"io_uring/io-wq: check IO_WQ_BIT_EXIT inside work\nrun loop\") fixed the obvious case where io_worker_handle_work() took one\nexit-bit snapshot before draining pending work, but the fix stops one\nlevel too early.\n\nio_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work\nrun loop, yet it still snapshots that bit once before processing a whole\ndependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT\nafter the first linked item has started, the remaining linked items can\nstill reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue\nrunning after exit has begun.\n\nMove the check further inside, so it covers linked items too. Note: this\nis a syzbot special as it loves setting up tons of slow linked work on\nweird devices like msr that take forever to read, and immediately close\nthe ring. Exit then takes a long time."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:25.440Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549"
        },
        {
          "url": "https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a"
        }
      ],
      "title": "io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64425",
    "datePublished": "2026-07-25T08:51:03.036Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-08-17T04:55:25.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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