Separately, researcher Asim Manizada disclosed four local privilege escalation flaws — CVE-2026-80844 ("DirtyAH6"), CVE-2026-81000 ("TUNderflow"), CVE-2026-68121 ("PPPoEject") and CVE-2026-74469 ("DiagSpill") — adding to a fortnight in which kernel privilege escalation has been the most crowded corner of the disclosure queue.

NVD 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.