CVE-2026-99256LowLocalRevised 7 Nov

dm cache: fix issue with background work locking

MSRC advisory NVD CVE.org

Assessment

Severity: Low
CVSS base score: 2.3
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:H/UI:N/S:U/C:N/I:N/A:L
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: HighPR:H
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: NoneC:N
Integrity: NoneI:N
Availability: LowA:L

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 14:55 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 14:55 UTC

Explore global source statements, affected packages and advisory history for CVE-2026-99256. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-99256

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": [
                        "drivers/md/dm-cache-target.c"
                    ],
                    "versions": [
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "0c7a8cad7c96012a9157a189649e569d0390f384",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "f5db935d257023c3ef410bd39163b949b0e5a55d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "6290507ecc0dd6dd40759729cbbbd49b1d2a63c4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "8433fd005c25fd127021f67c9144a879fb585572",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "2f2cfa16dd0f4179bb988139dd37d00a42324f6c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "73df2ff409f3db95029982fe3656329568e3715d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "104f09e02038b0fc6bbb718b3976af029e15c1d0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f",
                            "lessThan": "bc9781c0247de107876f32929f1637db93a42b34",
                            "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": [
                        "drivers/md/dm-cache-target.c"
                    ],
                    "versions": [
                        {
                            "version": "4.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.273",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.224",
                            "lessThanOrEqual": "5.15.*",
                            "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": "6.18.59",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.13",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

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