CVE-2026-98374ModerateLocalRevised 21 Oct

tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack()

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U
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: 9 Oct 2026 · October 2026
Last revised: 21 Oct 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: LocalAV:L
Attack complexity: LowAC:L
Privileges required: LowPR:L
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: HighC:H
Integrity: NoneI:N
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 14 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 5 more recent changes

21 Oct 2026 · 20:45:25 UTCLast revised 15 Oct 2026 02:50 UTC → 21 Oct 2026 18:41 UTC
18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
15 Oct 2026 · 07:14:54 UTCLast revised 13 Oct 2026 14:54 UTC → 15 Oct 2026 02:50 UTC
14 Oct 2026 · 11:22:42 UTCLast revised 9 Oct 2026 01:04 UTC → 13 Oct 2026 14:54 UTC
14 Oct 2026 · 11:22:42 UTCSource coverage: msrc-cvrf Incomplete → Current

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Explore global source statements, affected packages and advisory history for CVE-2026-98374. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-98374 · Microsoft / collected KEV context

cve-program · CVE-2026-98374

Related operational evidence

Explicit CVE identifiers

tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() · Advisory content revised · 24 Oct 2026