CVE-2026-72250 (GCVE-0-2026-72250)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
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: netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag nf_ct_frag6_reasm() slides the packet head forward to drop the IPv6 fragment header and then unconditionally advances skb->mac_header: skb->mac_header += sizeof(struct frag_hdr); On the NF_INET_LOCAL_OUT defrag path the skb has no link-layer header yet, so skb->mac_header is still the "not set" sentinel (u16)~0U. Adding sizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7), after which skb_mac_header_was_set() wrongly reports a MAC header is present and skb_mac_header() points into the headroom. The reassembler has done this unconditional add since it was introduced; it was harmless while mac_header was a bare pointer, but wrong once mac_header became a u16 offset whose unset state is the ~0U sentinel tested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c does the same relocation and does guard the adjustment; mirror the guard here.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
Version: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1
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still the \\\"not set\\\" sentinel (u16)~0U. Adding\\nsizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7),\\nafter which skb_mac_header_was_set() wrongly reports a MAC header is\\npresent and skb_mac_header() points into the headroom.\\n\\nThe reassembler has done this unconditional add since it was introduced;\\nit was harmless while mac_header was a bare pointer, but wrong once\\nmac_header became a u16 offset whose unset state is the ~0U sentinel\\ntested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c\\ndoes the same relocation and does guard the adjustment; mirror the\\nguard here.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:42:02.183Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72250\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:13.023Z\", \"dateReserved\": \"2026-08-09T03:40:39.915Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:54:39.134Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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