CVE-2026-98432ImportantNetworkRevised 21 Oct

ipv4: free inet_opt and ireq_opt after an RCU grace period

MSRC advisory NVD CVE.org

Assessment

Severity: Important
CVSS base score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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: 16 Oct 2026 · October 2026
Last revised: 21 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: HighC:H
Integrity: HighI:H
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 17 Oct 2026

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
23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete

Show 4 more recent changes

21 Oct 2026 · 20:45:25 UTCLast revised 21 Oct 2026 01:44 UTC → 21 Oct 2026 18:32 UTC
21 Oct 2026 · 07:25:48 UTCLast revised 18 Oct 2026 14:43 UTC → 21 Oct 2026 01:44 UTC
19 Oct 2026 · 07:30:08 UTCLast revised 16 Oct 2026 14:43 UTC → 18 Oct 2026 14:43 UTC
18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves

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Explore global source statements, affected packages and advisory history for CVE-2026-98432. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-98432

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": [
                        "net/ipv4/af_inet.c",
                        "net/ipv4/tcp_ipv4.c"
                    ],
                    "versions": [
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "b3b027ef0cd322bfa839b9aaf5b27551eea54cf6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "95a8c8fa9f27dce64c40c41c062de7728bf34ab5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "89b5b1eb7d633c33832b7ff2c02e19a144705036",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "742f73df544e03744f2981c467d6542fe8172a2a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "11a03ce3c4a62d84c10ccdfe47f8075006498568",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "a47406c769f72c070386985488f1c4d057df86b2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "26d4c36d318cffbbd160884a0e4cec0da4da4936",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "079096f103faca2dd87342cca6f23d4b34da8871",
                            "lessThan": "e3f33b0a1d89d738e2b913dab519226eaf76e15b",
                            "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": [
                        "net/ipv4/af_inet.c",
                        "net/ipv4/tcp_ipv4.c"
                    ],
                    "versions": [
                        {
                            "version": "4.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.272",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.223",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.190",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.159",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.113",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.56",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.10",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }