Answer in brief
CVE-2026-80844 records a Unknown severity vulnerability in xfrm: ah6: validate routing header segments_left. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2dc650956e4e163b879b3fb1027f9557abc5c985 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <48b0e36cf54358276ee7aa897034c973097d2bc9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1b7e066eabcc7d6d8f476c34739b45932f2f4c31 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f00df8500e5a36ba70d336fd34bd2152ea074e5f || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1516e31ac458a738be485620579d8f7fb2700fcb || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6733ae71268a27d598cfb3f3339a3c950b9b656d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0bf11081ad3753938a2b48723ce6298dbac743a1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46640c814f25f096b0b0045ca50e1b7030cd8a30 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7bad4bda74dc4713f398d3b7624ff05478e3a568 | 2dc650956e4e163b879b3fb1027f9557abc5c985, 48b0e36cf54358276ee7aa897034c973097d2bc9, 1b7e066eabcc7d6d8f476c34739b45932f2f4c31, f00df8500e5a36ba70d336fd34bd2152ea074e5f, 1516e31ac458a738be485620579d8f7fb2700fcb, 6733ae71268a27d598cfb3f3339a3c950b9b656d, 0bf11081ad3753938a2b48723ce6298dbac743a1, 46640c814f25f096b0b0045ca50e1b7030cd8a30, 7bad4bda74dc4713f398d3b7624ff05478e3a568 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 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. 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.
Quoted source text, attributed separately from HOL analysis.