CVE-2026-99253

io_uring/cancel: rearm local work wake up before sleep

Products / packages Linux

Published 03/11/2026, 11:20:12 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

3 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

d46ab2c98ababa19b41a5709b6921d7b1add7f74 → before aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2

git versions

d46ab2c98ababa19b41a5709b6921d7b1add7f74 → before 58ddf0ec707093206a5fe814581ec5aefac8b08a

git versions

d46ab2c98ababa19b41a5709b6921d7b1add7f74 → before 76a82c666abf155ad52d5f41043eac77dd3e41d8

git versions

Other versions: unaffected

Linux · Linux

Linux

5 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

7.2

unaffected

0 → before 7.2

semver versions

7.2.14 → through 7.2.*

semver versions

7.3.2 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

io_uring/cancel: rearm local work wake up before sleep

io_uring_try_cancel_requests() sets ->cq_wait_nr to 1 so that the next io_req_local_work_add() wakes the cancelling task. The add that takes the count to zero is the only one that wakes, later ones see a count <= 0 and return. io_uring_cancel_generic() however only becomes TASK_INTERRUPTIBLE much later, so the one wake up can be spent on a running task. That is fine as long as the entry of that add is still queued, as the io_local_work_pending() check then skips the sleep. It is not if the add was delayed after queueing its entry:

CPU0 (submitter in exec or exit) CPU1 (io_req_local_work_add) mpscq_push(req A) io_uring_try_cancel_requests() io_run_local_work() // runs req A io_uring_try_cancel_requests() atomic_set(&ctx->cq_wait_nr, 1) atomic_read(&ctx->cq_wait_nr) == 1 count taken, wake_up_state() // task is running, no-op prepare_to_wait(TASK_INTERRUPTIBLE) io_local_work_pending() == false schedule() mpscq_push(req B) cq_wait_nr <= 0, return

Only the sleeping task can run req B, so it is stuck in execve() until a signal happens to wake it. An exiting task doesn't even get that.

Arm the count again once the task state is set and before the work list is checked, for the rings whose local work this task is the one to run.

References

3 sources

git.kernel.org/stable/c/aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2

Source referenceLinux

git.kernel.org/stable/c/58ddf0ec707093206a5fe814581ec5aefac8b08a

Source referenceLinux

git.kernel.org/stable/c/76a82c666abf155ad52d5f41043eac77dd3e41d8

Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification · not supplied

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99253

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.2

After:

Through (inclusive):

Before: 7.2.14

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.2

After:

Through (inclusive):

Before: 7.3.2

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.2

After:

Through (inclusive):

Before: 7.4-rc1

Original applicability statements

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            "versionStartIncluding": "7.2",
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          }
        ]
      }
    ]
  }
]

Contributing organizations · 1

Linux

Assigning organization

2026-11-06

Timeline

All times UTC

3 Nov 2026, 11:20
Advisory published
Publication date supplied by the source.
6 Nov 2026, 17:15
Source updated
Latest modification date supplied by the source.
6 Nov 2026, 17:59
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-992532026-11-06

Observed 2026-11-06T17:59:00.829Z · upstream updated 2026-11-06T17:15:12.869Z

Product or version evidence changed

before

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
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        "version": "d46ab2c98ababa19b41a5709b6921d7b1add7f74",
        "status": "affected",
        "lessThan": "aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
        "versionType": "git"
      },
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  },
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    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "7.2",
        "status": "affected"
      },
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        "versionType": "semver"
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        "versionType": "semver"
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after

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        "status": "affected",
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        "versionType": "git"
      },
      {
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        "status": "affected",
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        "versionType": "git"
      }
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  },
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    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "7.2",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.2",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      },
      {
        "version": "7.4-rc1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
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  }
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References changed

before

[
  "https://git.kernel.org/stable/c/aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
  "https://git.kernel.org/stable/c/76a82c666abf155ad52d5f41043eac77dd3e41d8"
]

after

[
  "https://git.kernel.org/stable/c/aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
  "https://git.kernel.org/stable/c/58ddf0ec707093206a5fe814581ec5aefac8b08a",
  "https://git.kernel.org/stable/c/76a82c666abf155ad52d5f41043eac77dd3e41d8"
]

Environment requirements changed

before

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    "source": "Linux",
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            "negate": false,
            "cpeMatch": [
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                "versionEndExcluding": "7.2.14"
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              {
                "vulnerable": true,
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                "versionStartIncluding": "7.2",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
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      }
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  }
]

after

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                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "7.2",
                "versionEndExcluding": "7.3.2"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "7.2",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

CVE · CVE-2026-992532026-11-03

Observed 2026-11-03T19:51:06.922Z · upstream updated 2026-11-03T19:13:12.605Z

Product or version evidence changed

before

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "d46ab2c98ababa19b41a5709b6921d7b1add7f74",
        "status": "affected",
        "lessThan": "aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99253"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "7.2",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99253"
  }
]

after

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  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "d46ab2c98ababa19b41a5709b6921d7b1add7f74",
        "status": "affected",
        "lessThan": "aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
        "versionType": "git"
      },
      {
        "version": "d46ab2c98ababa19b41a5709b6921d7b1add7f74",
        "status": "affected",
        "lessThan": "76a82c666abf155ad52d5f41043eac77dd3e41d8",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99253"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "7.2",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
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        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
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        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
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    ],
    "defaultStatus": "affected",
    "cpes": [],
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  }
]

References changed

before

[
  "https://git.kernel.org/stable/c/aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2"
]

after

[
  "https://git.kernel.org/stable/c/aaa06bb9fc03384f7cf2dbc3e43f2939cc7791b2",
  "https://git.kernel.org/stable/c/76a82c666abf155ad52d5f41043eac77dd3e41d8"
]

Environment requirements changed

before

[
  {
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    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
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                "versionEndExcluding": "7.2.14"
              }
            ]
          }
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      }
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]

after

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                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "7.2",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

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CVE CVE-2026-99253

Enrichment coverage

NVDNo result

Checked 03/11/2026, 11:45:31 UTC

GHSANo result

Checked 03/11/2026, 11:45:33 UTC

EUVDNo result

Checked 03/11/2026, 11:45:33 UTC

EPSSNo result

Checked 03/11/2026, 11:45:33 UTC

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io_uring/cancel: rearm local work wake up before sleep

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed