Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 715eb12e453df752f1b4baaf972c3acff0ab9402; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 804bb969f194c93497ba632b98343794c6367fdc; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 0fc7069d39239978130c37ebceaec85c8948d3f1; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before 8dba7a94a269b88e500aafc25ad567ef6a423698; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before c9961336aa5ff83092f23e33ee86666a9dbd1b2a; affected fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 before a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa |
| Linux / Linux | affected 4.18; unaffected 0 before 4.18; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/715eb12e453df752f1b4baaf972c3acff0ab9402
- https://git.kernel.org/stable/c/7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73
- https://git.kernel.org/stable/c/071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e
- https://git.kernel.org/stable/c/804bb969f194c93497ba632b98343794c6367fdc
- https://git.kernel.org/stable/c/0fc7069d39239978130c37ebceaec85c8948d3f1
- https://git.kernel.org/stable/c/8dba7a94a269b88e500aafc25ad567ef6a423698
- https://git.kernel.org/stable/c/c9961336aa5ff83092f23e33ee86666a9dbd1b2a
- https://git.kernel.org/stable/c/a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa
ADP enrichment
No English description supplied.
No references supplied.