CVE-2026-99254ModerateLocalRevised 7 Nov

io_uring: don't flood a cancelling task with task_work

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: 5.5
Impact: Not stated
Exploitation detected: Unknown: not stated by MSRC
Exploitability: Not assessed
Publicly disclosed: Unknown: not stated by MSRC
EPSS · 30-day forecast: No EPSS score collected
Customer action: Required: follow the MSRC remediation guidance

More details

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Public detection template: No Nuclei template is listed in the current collected catalog
Component: Mariner
Weakness: —
Issued by: Linux
Published: 4 Nov 2026 · November 2026
Last revised: 7 Nov 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: LocalAV:L
Attack complexity: LowAC:L
Privileges required: LowPR:L
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: NoneC:N
Integrity: NoneI:N
Availability: HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software

1 affected product

azl3 kernel 6.6.159.1-1 on Azure Linux 3.0

What changed

Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC
Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC

Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version

Field-level log (10)

Up to 100 recent field edits are shown; older edits may be outside retention.

7 Nov 2026 · 08:59:22 UTC Last revised5 Nov 2026 14:54 UTC → 7 Nov 2026 01:45 UTC
6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
6 Nov 2026 · 08:04:49 UTC Last revised4 Nov 2026 14:46 UTC → 5 Nov 2026 14:54 UTC

Explore global source statements, affected packages and advisory history for CVE-2026-99254. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-99254

Published

Linux

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io_uring.c"
                    ],
                    "versions": [
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "a22fb44e988b01b82235ea07f0bf0fc73e256596",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "2c75ebae8a7f09c99e31c7042b7d4d595f03b2b1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "61c761fc21e00e45c33c2bb596be442d92fb8792",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "14f56e9c0b8fdc2e178acdbec9781e90ef46f7e9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "abdc57c7ebabaaf0b622178a6a85834e1e54ff80",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "f334e79a11e084713e82402b1a7a0e321526992a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d56d938b4bef3e1421a42023cdcd6e13c1f50831",
                            "lessThan": "22e643e61b9b6299b42ff7d88bab48bccada8a5d",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

Linux

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io_uring.c"
                    ],
                    "versions": [
                        {
                            "version": "5.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.191",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.161",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.115",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.60",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.14",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3.2",
                            "lessThanOrEqual": "7.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.4-rc1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON