In the Linux kernel, the following vulnerability has been resolved:

seg6: validate SRH length before reading fixed fields

seg6_validate_srh() reads fixed SRH fields such as srh->type and
srh->hdrlen before checking that the supplied length covers the fixed
struct ipv6_sr_hdr fields.

The BPF SEG6 encap path reaches this with a BPF program-supplied pointer
and length: bpf_lwt_push_encap() and the SEG6 local BPF END_B6 and
END_B6_ENCAP actions call bpf_push_seg6_encap(), which forwards the
length to seg6_validate_srh() with no minimum-size guard.  A 2-byte SEG6
encap header can therefore make the validator read srh->type at offset 2
beyond the caller-supplied buffer.

Reject lengths shorter than the fixed SRH at the top of
seg6_validate_srh(), before any field is read.  This fixes the BPF helper
path and keeps the common validator robust.

https://git.kernel.org/stable/c/071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e

https://git.kernel.org/stable/c/0fc7069d39239978130c37ebceaec85c8948d3f1

https://git.kernel.org/stable/c/715eb12e453df752f1b4baaf972c3acff0ab9402

https://git.kernel.org/stable/c/7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73

https://git.kernel.org/stable/c/804bb969f194c93497ba632b98343794c6367fdc

https://git.kernel.org/stable/c/8dba7a94a269b88e500aafc25ad567ef6a423698

https://git.kernel.org/stable/c/a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa

https://git.kernel.org/stable/c/c9961336aa5ff83092f23e33ee86666a9dbd1b2a

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