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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-10-15 01:23
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed 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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
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            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "configurations": [
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        "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."
          }
        ],
        "id": "CVE-2026-64425",
        "lastModified": "2026-10-15T02:20:13.903",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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            "description": [
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                "lang": "en",
                "value": "NVD-CWE-noinfo"
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-29T12:22:51+00:00",
      "cve": "CVE-2026-64425",
      "id": "CVE-2026-64425",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64425.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-27T01:30:36Z",
      "cve": "CVE-2026-64425",
      "id": "CVE-2026-64425",
      "initial_release_date": "2026-07-25T15:59:35Z",
      "product_status:known_affected": "453",
      "product_status:known_not_affected": "298",
      "product_status:recommended": "111",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64425",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-64425.json",
      "version": "11"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

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