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ipv6: fix use-after-free in ip6_finish_output2()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix use-after-free in ip6_finish_output2() ip6_finish_output2() caches a pointer to the IPv6 destination address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF transmit path or other encapsulation operations within lwtunnel_xmit() can reallocate the skb head, freeing the memory that daddr points to. When lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale daddr pointer to compute the nexthop and to look up or create the neighbour entry. This results in a use-after-free read, which can leak sensitive kernel data, pollute the neighbour table with arbitrary values, misdirect traffic, or crash the system. Fix this by re-fetching the IPv6 header and the destination address pointer after lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop computation and neighbour lookup operate on valid memory.

Announced Source revision 1
Original source ↗

CVE-2026-80792

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-2026-80792

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": "4132c4ad00ddbf3a175ea0d2c775b662a32f4c85",
        "lessThan": "75e0a544ebe9af663ef53ca21e9e9185c51fb54a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2",
        "lessThan": "c95f01b78266828a57060d754fcbfc92123a98ed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2",
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        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2",
        "lessThan": "087ee0d914aaae929f1660c9ca878e367655ba1a",
        "versionType": "git"
      },
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        "versionType": "git"
      },
      {
        "status": "affected",
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        "versionType": "git"
      },
      {
        "status": "affected",
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      },
      {
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        "lessThan": "73a187384a8c8b983c7fea046d716b6752a1e7a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2",
        "lessThan": "d0d48d999b0eee6bb176ef4e39d9be868fa80f7e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1598154fd28ffa4a55beae1970475fd6776554b6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.233",
        "lessThan": "5.10.267",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.4.289",
        "lessThan": "5.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_output.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.267",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.218",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.185",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.154",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.106",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.47",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.1",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_output.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80792

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34808 · Revision 1
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Publisher date
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