{"apiVersion":"1.0","identifier":"CVE-2026-72400","description":"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.","publishedAt":"2026-08-15T06:22:13","lastModifiedAt":"2026-08-17T06:19:06","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72400","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00169,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72400","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72400","en":"https://www.redsauce.net/en/cves/CVE-2026-72400","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72400","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72400","de":"https://www.redsauce.net/de/cves/CVE-2026-72400","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72400","el":"https://www.redsauce.net/el/cves/CVE-2026-72400"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72400"}}