CVE-2026-98491ImportantNetworkRevised 24 Oct

net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

MSRC advisory NVD CVE.org

Assessment

Severity: Important
CVSS base score: 7.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
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: 20 Oct 2026 · October 2026
Last revised: 24 Oct 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: HighAC:H
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: LowC:L
Integrity: LowI:L
Availability: HighA:H

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

What changed

First observed 21 Oct 2026

25 Oct 2026 · 07:41:18 UTC Last revised21 Oct 2026 18:35 UTC → 24 Oct 2026 14:44 UTC
23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Show 2 more recent changes

23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
21 Oct 2026 · 20:45:25 UTCLast revised 20 Oct 2026 14:43 UTC → 21 Oct 2026 18:35 UTC

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

Explore global source statements, affected packages and advisory history for CVE-2026-98491. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-98491

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": [
                        "include/net/netfilter/nf_conntrack.h",
                        "net/openvswitch/conntrack.c"
                    ],
                    "versions": [
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "37e3c878b183a115f9a114067f9ef3b408ad27fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "707c2dc77891a874f4e8c52c285a511079164ec8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "de41ee24f77b0fc45397db3e277cae2adbd43dfe",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "55e5256adf3940e71802e2f749cacf81518726b0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "e2829ae5459ddb5fce526b2e84697edf6c0c3cef",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "26b2bd70d22457556e2fa01cbf1192cb1a94d619",
                            "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": [
                        "include/net/netfilter/nf_conntrack.h",
                        "net/openvswitch/conntrack.c"
                    ],
                    "versions": [
                        {
                            "version": "4.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.112",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.55",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }