CVE-2026-64425 (GCVE-0-2026-64425)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
Title
io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 065dd936195a3466b8ebe5f9287400987ee3c063 , < 14b7ecad2ec56699325180a744f4b19f046401bb (git)
Affected: 27e47500fac23d15b7dc93ff650bc4844d2581bd , < d179533c610e1b4c6aa436e3c1fd1b719d2c727c (git)
Affected: d05d99573f81a091547b1778b9a50120f5d6c68a , < 6e2f51f3e06773c2ee98ad09738f0908b48f76f9 (git)
Affected: 85eb83694a91c89d9abe615d717c0053c3efa714 , < ea61b04e1d7242cb37f5ed2cc91cf21a493f6597 (git)
Affected: 2e8ca1078b14142db2ce51cbd18ff9971560046b , < b6f179a653a934736c88d820fe0098c3c2532549 (git)
Affected: bdf0bf73006ea8af9327cdb85cfdff4c23a5f966 , < 1636d85dc139b07c0449308f2bb5e0c7a2e0da99 (git)
Affected: 10dc959398175736e495f71c771f8641e1ca1907 , < ab85765cbe3258b43dc6729af0e6ce3a87a133d8 (git)
Affected: 10dc959398175736e495f71c771f8641e1ca1907 , < 29bef9934b2521f787bb15dd1985d4c0d12ae02a (git)
Affected: 5.10.253 , < 5.10.261 (semver)
Affected: 5.15.203 , < 5.15.212 (semver)
Affected: 6.1.167 , < 6.1.178 (semver)
Affected: 6.6.122 , < 6.6.145 (semver)
Affected: 6.12.68 , < 6.12.96 (semver)
Affected: 6.18.8 , < 6.18.39 (semver)
Create a notification for this product.
Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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              "versionType": "original_commit_for_fix"
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          "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": "2026-07-25T08:51:03.036Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb"
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          "url": "https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a"
        }
      ],
      "title": "io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64425",
    "datePublished": "2026-07-25T08:51:03.036Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-07-25T08:51:03.036Z",
    "state": "PUBLISHED"
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      "date": "2026-07-27",
      "epss": "0.00177",
      "percentile": "0.07465"
    },
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      "current_release_date": "2026-07-26T01:07:19.000Z",
      "cve": "CVE-2026-64425",
      "id": "msrc_CVE-2026-64425",
      "initial_release_date": "2026-07-26T01:07:19.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64425.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64425\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:26.600\",\"lastModified\":\"2026-07-25T10:17:26.600\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"io_uring/io-wq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"065dd936195a3466b8ebe5f9287400987ee3c063\",\"lessThan\":\"14b7ecad2ec56699325180a744f4b19f046401bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27e47500fac23d15b7dc93ff650bc4844d2581bd\",\"lessThan\":\"d179533c610e1b4c6aa436e3c1fd1b719d2c727c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d05d99573f81a091547b1778b9a50120f5d6c68a\",\"lessThan\":\"6e2f51f3e06773c2ee98ad09738f0908b48f76f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"85eb83694a91c89d9abe615d717c0053c3efa714\",\"lessThan\":\"ea61b04e1d7242cb37f5ed2cc91cf21a493f6597\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2e8ca1078b14142db2ce51cbd18ff9971560046b\",\"lessThan\":\"b6f179a653a934736c88d820fe0098c3c2532549\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdf0bf73006ea8af9327cdb85cfdff4c23a5f966\",\"lessThan\":\"1636d85dc139b07c0449308f2bb5e0c7a2e0da99\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10dc959398175736e495f71c771f8641e1ca1907\",\"lessThan\":\"ab85765cbe3258b43dc6729af0e6ce3a87a133d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10dc959398175736e495f71c771f8641e1ca1907\",\"lessThan\":\"29bef9934b2521f787bb15dd1985d4c0d12ae02a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.253\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.203\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.167\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.122\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.68\",\"lessThan\":\"6.12.96\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.8\",\"lessThan\":\"6.18.39\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"io_uring/io-wq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:35Z",
      "cve": "CVE-2026-64425",
      "id": "CVE-2026-64425",
      "initial_release_date": "2026-07-25T15:59:35Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64425",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64425.json",
      "version": "2"
    }
  }
}



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