CVE-2026-80844None▾ TwilightPoC availableIn 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 seg…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 2.8 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
3 GitHub repos (last check)
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.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2dc650956e4e163b879b3fb1027f9557abc5c985Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 48b0e36cf54358276ee7aa897034c973097d2bc9Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1b7e066eabcc7d6d8f476c34739b45932f2f4c31Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f00df8500e5a36ba70d336fd34bd2152ea074e5fLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1516e31ac458a738be485620579d8f7fb2700fcbLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6733ae71268a27d598cfb3f3339a3c950b9b656dLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0bf11081ad3753938a2b48723ce6298dbac743a1Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 46640c814f25f096b0b0045ca50e1b7030cd8a30Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7bad4bda74dc4713f398d3b7624ff05478e3a568Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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