CVE-2026-72400 (GCVE-0-2026-72400)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-10-16 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
Version: fe94cc290f535709d3c5ebd1e472dfd0aec7ee79
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A 2-byte SEG6\\nencap header can therefore make the validator read srh-\u003etype at offset 2\\nbeyond the caller-supplied buffer.\\n\\nReject lengths shorter than the fixed SRH at the top of\\nseg6_validate_srh(), before any field is read.  This fixes the BPF helper\\npath and keeps the common validator robust.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:43:42.988Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72400\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:21.670Z\", \"dateReserved\": \"2026-08-09T03:40:39.925Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:56:25.572Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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