CVE-2026-72400

Status: UPDATED  |  Advisory ID: CVE-2026-72400

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References