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ipv6: sr: restore network header before routing and forwarding

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: restore network header before routing and forwarding ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH) while skb_network_header() points at the IPv6 header. When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately followed the fixed IPv6 header. If another extension header (such as a Hop-by-Hop options header) precedes the SRH, skb_network_offset() remained negative. This led to two problems: 1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes __skb_flow_dissect() which passes the negative skb_network_offset() to flow dissection, breaking BPF and C flow dissector logic. 2. If forwarded via ip6_forward() or redirected via act_mirred, downstream handlers (like sch_fragment() or neighbour output) pass the negative offset as an unsigned length, triggering OOB memcpy or buffer overflows. Fix this by pushing -skb_network_offset(skb) before routing, ensuring skb_network_offset(skb) is 0 for route lookup / flow dissection as well as downstream forwarding. On the loopback path, pull skb_transport_offset(skb) to restore skb->data to the SRH before looping back.

Announced Source revision 1
Original source ↗

CVE-2026-98096

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98096

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "f463c4786cf27376de7dfc0833a12e924a98f698",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "8f44d4160bcdb3136a9145a4b9c7816382976925",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "af08f62b5a5a446d6134a92d86771d3d12e0e3da",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "ce4c8beedc19aceeab0e7bdc6f34394fb158c47c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "97b21ef57dfabbff660a4672c9fef7edfb720f47",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "3ad7dca5e03bd64c65983a19734337512fd75491",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ababeba4a21f3dba3da3523c670b207fb2feb62",
        "lessThan": "975b5b067f525a1b1338c4a3bee1c46545801518",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/exthdrs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/exthdrs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98096

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38202 · Revision 1
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Publisher date
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