Answer in brief
CVE-2026-72400 records a High severity (CVSS 7.8) vulnerability in seg6: validate SRH length before reading fixed fields. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <715eb12e453df752f1b4baaf972c3acff0ab9402 || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73 || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <804bb969f194c93497ba632b98343794c6367fdc || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <0fc7069d39239978130c37ebceaec85c8948d3f1 || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <8dba7a94a269b88e500aafc25ad567ef6a423698 || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <c9961336aa5ff83092f23e33ee86666a9dbd1b2a || >=fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 <a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa | 715eb12e453df752f1b4baaf972c3acff0ab9402, 7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73, 071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e, 804bb969f194c93497ba632b98343794c6367fdc, 0fc7069d39239978130c37ebceaec85c8948d3f1, 8dba7a94a269b88e500aafc25ad567ef6a423698, c9961336aa5ff83092f23e33ee86666a9dbd1b2a, a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa |
| Linux/Linuxgeneric | 4.18 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.