CVE-2026-99274ModerateNetwork

smb: client: fix fiemap wild read on empty truncated response

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: 6.5
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:N/AC:L/PR:N/UI:R/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: 9 Nov 2026 · November 2026
Last revised: 9 Nov 2026

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: LowAC:L
Privileges required: NonePR:N
User interaction: RequiredUI:R
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 6.6.161.1-1 on Azure Linux 3.0

Page history

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Explore global source statements, affected packages and advisory history for CVE-2026-99274. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-99274

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": [
                        "fs/smb/client/smb2ops.c"
                    ],
                    "versions": [
                        {
                            "version": "2f3ebaba13cebd8badfb9aed31c0cf3cc82eb4f4",
                            "lessThan": "4a426ca5be7e3dedbe76575b967db04fbf01136f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f3ebaba13cebd8badfb9aed31c0cf3cc82eb4f4",
                            "lessThan": "31f6dbb29fe17fa9595c7e8b19fd92915b03a4ca",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f3ebaba13cebd8badfb9aed31c0cf3cc82eb4f4",
                            "lessThan": "f5baa17a0f316c235d61623ac8e8fb32c2b3c0cc",
                            "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": [
                        "fs/smb/client/smb2ops.c"
                    ],
                    "versions": [
                        {
                            "version": "5.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.61",
                            "lessThanOrEqual": "6.18.*",
                            "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