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ipv6: exthdrs: refresh nh after handling HAO option

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.

Announced Source revision 1
Original source ↗

CVE-2026-63922

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-2026-63922

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": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "b3ac54e5c905f86d22b502eacb5686a282c5659f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "f8aabed3ff3e986920cf02a2a2785e08e586b234",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "12d957979e4a800167842f1b42be6a606d227ebe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "ff375ed1cba81392346c5bfbf0bb7a13b2946f99",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "751db1b802a067b7fff25880f4e9f9152a171538",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "9b6dcc0a39fd71752937f0b6b3973e1416085dcf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
        "lessThan": "f7b52afe3592eae66e160586b45a3f2242972c63",
        "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": "2.6.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/exthdrs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63922

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40895 · Revision 1
Added to Heist Feed
Publisher date
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