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NVD / CVE Program· CNA Linux

CVE-2026-80890: sctp: reject stale cookies with mismatched verification tags

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 35c279113498d19a8734e2aae67b951b9b20f634, 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e, 817cffdbdbdf50e1f2b016599d1897de3ca54964; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.

Low priority for now. Upgrade to Linux Linux 35c279113498d19a8734e2aae67b951b9b20f634, 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e, 817cffdbdbdf50e1f2b016599d1897de3ca54964; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent. The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association. Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Sep 4, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f6e3cc296372accad4ee57405195021231ef4bcbaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c151daba0ceb1fb068a215b07de89fb1eb5f87bcaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 817cffdbdbdf50e1f2b016599d1897de3ca54964affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 61baa5020b0afb41bfd97f8f6ce5e336c4a4546eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c68557a49e960dbcdede22c7a9b488603078b8b4affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a0d1693923f41d6f49083aa2446686aed09d1d79affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 35c279113498d19a8734e2aae67b951b9b20f634affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587affected · git
    • before 2.6.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80888Sep 4, 2026 · drm/vmwgfx: drop dma_buf reference on foreign-fd prime import
    0Monitor
  • ← EarlierCVE-2026-80889Sep 4, 2026 · can: isotp: fix timer drain order, wakeup handling and tx_gen ordering
    0Monitor
  • Later →CVE-2026-80891Sep 4, 2026 · KVM: s390: pci: Validate AIBV and AISB before pinning guest pages
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux35c279113498d19a8734e2aae67b951b9b20f634Vendor (CNA)
Linux Linux61baa5020b0afb41bfd97f8f6ce5e336c4a4546eVendor (CNA)
Linux Linux817cffdbdbdf50e1f2b016599d1897de3ca54964Vendor (CNA)
Linux Linux9d8da8e0a9bce4a340af60dd0446bc7eb8d07587Vendor (CNA)
Linux Linuxa0d1693923f41d6f49083aa2446686aed09d1d79Vendor (CNA)
Linux Linuxc151daba0ceb1fb068a215b07de89fb1eb5f87bcVendor (CNA)
Linux Linuxc68557a49e960dbcdede22c7a9b488603078b8b4Vendor (CNA)
Linux Linuxf6e3cc296372accad4ee57405195021231ef4bcbVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records