CVE-2026-80844Hinoki check available

Out-of-bounds access via malformed AH6 routing header

Published Sep 4, 2026 · Updated Sep 4, 2026

Out-of-bounds access in affected Linux kernel branches allows local users to trigger an oversized memmove via raw IPv6 HDRINCL packets. In net/ipv6/ah6.c, ipv6_rearrange_rthdr() trusts segments_left despite a smaller hdrlen, shifts an address pointer backward, and copies 4,064 bytes. Creating the trigger requires raw-socket privileges; the public record establishes an out-of-bounds kernel access but does not specify a crash, disclosure, or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in affected Linux kernel branches allows local users to trigger an oversized memmove via raw IPv6 HDRINCL packets. In net/ipv6/ah6.c, ipv6_rearrange_rthdr() trusts segments_left despite a smaller hdrlen, shifts an address pointer backward, and copies 4,064 bytes. Creating the trigger requires raw-socket privileges; the public record establishes an out-of-bounds kernel access but does not specify a crash, disclosure, or code execution.

The record

CVE
CVE-2026-80844
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0bf11081ad3753938a2b48723ce6298dbac743a1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1516e31ac458a738be485620579d8f7fb2700fcb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1b7e066eabcc7d6d8f476c34739b45932f2f4c31
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2dc650956e4e163b879b3fb1027f9557abc5c985
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46640c814f25f096b0b0045ca50e1b7030cd8a30
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <48b0e36cf54358276ee7aa897034c973097d2bc9
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6733ae71268a27d598cfb3f3339a3c950b9b656d
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7bad4bda74dc4713f398d3b7624ff05478e3a568
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f00df8500e5a36ba70d336fd34bd2152ea074e5f
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0bf11081ad3753938a2b48723ce6298dbac743a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1516e31ac458a738be485620579d8f7fb2700fcb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1b7e066eabcc7d6d8f476c34739b45932f2f4c31; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2dc650956e4e163b879b3fb1027f9557abc5c985; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46640c814f25f096b0b0045ca50e1b7030cd8a30; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <48b0e36cf54358276ee7aa897034c973097d2bc9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6733ae71268a27d598cfb3f3339a3c950b9b656d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7bad4bda74dc4713f398d3b7624ff05478e3a568; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f00df8500e5a36ba70d336fd34bd2152ea074e5f; version=2.6.12

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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