CVE-2026-80844

UNRATEDCVSS · not yet scoredTrending — Patch released this week
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

xfrm: ah6: validate routing header segments_left

AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field.

That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access.

Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
—
EG Risk
—
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

Published

September 4, 2026

Last Modified

September 4, 2026

References (9)

Vendor Advisories for CVE-2026-80844(17)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:6.12.0-259.28.el10nv2026-10-02redhat
redhatkernel-0:2.6.32-754.63.1.el62026-09-24redhat
redhatkernel-0:3.10.0-1160.164.1.el72026-09-24redhat
redhatkernel-0:6.12.0-211.59.1.el10_22026-09-24redhat
redhatkernel-0:6.12.0-55.107.1.el10_02026-09-24redhat
redhatkernel-0:4.18.0-305.209.1.el8_42026-09-24redhat
redhatkernel-0:4.18.0-477.170.1.el8_82026-09-24redhat
redhatkernel-0:5.14.0-687.51.1.el9_82026-09-24redhat
redhatkernel-rt-0:5.14.0-284.194.1.rt14.479.el9_22026-09-24redhat
redhatkernel-0:5.14.0-427.152.1.el9_42026-09-24redhat
redhatkernel-0:4.18.0-553.167.1.el8_102026-09-24redhat
redhatkernel-0:4.18.0-372.218.1.el8_62026-09-24redhat
redhatkernel-0:5.14.0-284.194.1.el9_22026-09-24redhat
redhatkernel-0:5.14.0-570.144.1.el9_62026-09-24redhat
redhatkernel-rt-0:3.10.0-1160.164.1.rt56.1316.el72026-09-24redhat
redhatkernel-rt-0:4.18.0-553.167.1.rt7.508.el8_102026-09-23redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (172 versions)
  • every version up to 7.1.13-1: fixed in 7.1.13-1
—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-03 14:26 UTCEPSS rescore
  3. 2026-10-03 06:37 UTCVendor advisory
  4. 2026-10-03 06:37 UTCGHSA enrichment
  5. 2026-10-02 17:57 UTCEPSS rescore
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 15:04 UTCEPSS rescore
  8. 2026-09-30 02:42 UTCEG score recompute
  9. 2026-09-30 02:42 UTCVendor advisory
  10. 2026-09-30 02:42 UTCGHSA enrichment
  11. 2026-09-28 13:52 UTCEPSS rescore
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 20:16 UTCVendor advisory
  14. 2026-09-26 20:16 UTCGHSA enrichment
  15. 2026-09-26 15:59 UTCEPSS rescore
  16. 2026-09-26 00:28 UTCEPSS rescore
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-23 15:48 UTCVendor advisory
  20. 2026-09-23 15:48 UTCGHSA enrichment
  21. 2026-09-22 16:01 UTCEPSS rescore
  22. 2026-09-21 21:09 UTCEPSS rescore
  23. 2026-09-20 20:16 UTCEPSS rescore
  24. 2026-09-20 11:55 UTCVendor advisory
  25. 2026-09-20 11:55 UTCGHSA enrichment
Show 21 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 08:00 UTCVendor advisory
  3. 2026-09-17 08:00 UTCGHSA enrichment
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 04:06 UTCVendor advisory
  9. 2026-09-14 04:06 UTCGHSA enrichment
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 00:12 UTCGHSA enrichment
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 20:18 UTCEG score recompute
  15. 2026-09-07 20:18 UTCVendor advisory
  16. 2026-09-07 20:18 UTCGHSA enrichment
  17. 2026-09-06 13:48 UTCEPSS rescore
  18. 2026-09-05 15:31 UTCEPSS rescore
  19. 2026-09-04 16:22 UTCNVD update
  20. 2026-09-04 16:05 UTCEG score recompute
  21. 2026-09-04 16:04 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2026-80844?
CVE-2026-80844 is a publicly disclosed vulnerability published on September 4, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6rearrangerthdr() assumes that segments_left is not larger than the number of addresses described by…
When was CVE-2026-80844 disclosed?
CVE-2026-80844 was first published on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80844 actively exploited?
CVE-2026-80844 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-80844?
A fix for CVE-2026-80844 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-80844 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-80844

Explore →

Is Your Infrastructure Affected by CVE-2026-80844?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs