Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

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

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/14b7ecad2ec566993…
https://git.kernel.org/stable/c/d179533c610e1b4c6…
https://git.kernel.org/stable/c/6e2f51f3e06773c2e…
https://git.kernel.org/stable/c/ea61b04e1d7242cb3…
https://git.kernel.org/stable/c/b6f179a653a934736…
https://git.kernel.org/stable/c/1636d85dc139b07c0…
https://git.kernel.org/stable/c/ab85765cbe3258b43…
https://git.kernel.org/stable/c/29bef9934b2521f78…

Impacted products

2 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)
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)

Show details on NVD website

JSON

To clipboard

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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. 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    "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"
    }
  }
}

GHSA-RMW8-W7CG-RWFM

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64425"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:26Z",
    "severity": null
  },
  "details": "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": "GHSA-rmw8-w7cg-rwfm",
  "modified": "2026-07-25T12:31:35Z",
  "published": "2026-07-25T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64425"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

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.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

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

GHSA-RMW8-W7CG-RWFM

Tags

Sightings

Nomenclature