CVE-2026-99040ModerateLocalRevised 26 Oct

KEYS: Fix add_key() race with keyring restriction

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Impact: Not stated
EPSS, next 30 days: Not scored yet
Public exploit code: No Nuclei template lists it
Exploitability: Not assessed
Publicly disclosed: No
Customer action: Required: apply the update
Component: Mariner
Weakness: —
Issued by: Linux
Published: 25 Oct 2026 · October 2026
Last revised: 26 Oct 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: LocalAV:L
Attack complexity: HighAC:H
Privileges required: LowPR:L
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: NoneC:N
Integrity: HighI:H
Availability: NoneA:N

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product

azl3 kernel 6.6.157.1-1 on Azure Linux 3.0

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 (0)

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

No retained field changes for this selection.

Explore global source statements, affected packages and advisory history for CVE-2026-99040. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-99040

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": [
                        "security/keys/key.c"
                    ],
                    "versions": [
                        {
                            "version": "5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c",
                            "lessThan": "305f1828b871dd46bf41addeb6f11d2c162dcb25",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c",
                            "lessThan": "f99399b48e3edd6851fac34cd329bab9f1f33baf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c",
                            "lessThan": "11516a0c402a6c1fa52254aa70d8d65fb921e59e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c",
                            "lessThan": "da0b595d8e6e2dd798f6e34e09dc51a13b888514",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c",
                            "lessThan": "dd3ea3fcba7c75493760cdbccd35f029597e8d5e",
                            "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": [
                        "security/keys/key.c"
                    ],
                    "versions": [
                        {
                            "version": "4.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.113",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.11",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }