8.3

CVE-2026-80844: linux

CVSS: 8.3v3.1HighReceived
AliasesRHSA-2026:74974UBUNTU-CVE-2026-80844DEBIAN-CVE-2026-80844
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80844 is a high (CVSS 8.3) vulnerability in linux. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 36.2% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v3.1 (OSV · Red hat), selected by version preference
EPSS score
0.43%
0%100%
Low · +0.24 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 26 · Related 10
MGASA-2026-0506OPENSUSE-SU-2026:11773-1OPENSUSE-SU-2026:22091-1RHSA-2026:71016RHSA-2026:71213RHSA-2026:71232

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.24 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Redhat28 products
  • kernel< 0:6.12.0-259.28.el10nv
  • kernel-64k< 0:6.12.0-259.28.el10nv
  • kernel-64k-core< 0:6.12.0-259.28.el10nv
  • kernel-64k-debug< 0:6.12.0-259.28.el10nv
  • kernel-64k-debug-core< 0:6.12.0-259.28.el10nv
Debian2 products
  • linux< 6.1.187-1 | < 6.12.111-1 | < 7.1.13-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2dc650956e4e163b879b3fb1027f9557abc5c985 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 48b0e36cf54358276ee7aa897034c973097d2bc9 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1b7e066eabcc7d6d8f476c34739b45932f2f4c31 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f00df8500e5a36ba70d336fd34bd2152ea074e5f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1516e31ac458a738be485620579d8f7fb2700fcb | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6733ae71268a27d598cfb3f3339a3c950b9b656d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0bf11081ad3753938a2b48723ce6298dbac743a1 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 46640c814f25f096b0b0045ca50e1b7030cd8a30 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7bad4bda74dc4713f398d3b7624ff05478e3a568 | 2.6.12

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References

22 links
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