--- cve: "CVE-2026-80844" severity: "LOW" cvss: 3.1 epss: "0.2%" vendor: "Linux" kev: false exploited: false published: "2026-09-04 16:18:13" tags: [cve, security, low] source: tsecurity.de CVE-Dossier exported: "2026-09-21T06:29:20+02:00" --- # CVE-2026-80844 > 3.1 LOW ## Beschreibung 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. ## Patch verfügbar (OSV) - Kernel ≥ 5.10.269 - Kernel ≥ 5.15.220 - Kernel ≥ 6.1.187 - Kernel ≥ 6.6.156 - Kernel ≥ 6.12.108 - Kernel ≥ 6.18.49 - Kernel ≥ 7.1.13 - Kernel ≥ 7.2.3 ## Referenzen - - - - - - - - - --- _Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-80844) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_