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CVE-2026-31680 net: ipv6: flowlabel: defer exclusive option free until RCU teardown

🗓️ 25 Apr 2026 08:46:56Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 26 Views

Fixes race in ip6_flowlabel where freed option state could be dereferenced under RCU; keeps options alive until teardown.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/ip6_flowlabel.c"
    ],
    "versions": [
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "4b6798024f7b2d535f3db1002c760143cdbd1bd3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "3c54b66c83fb8fcbde8e6a7bf90b65856e39f827",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "5a6b15f861b7c1304949e3350d23490a5fe429fd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "6c7fbdb8ffde6413640de7cfbd7c976c353e89f8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "8027964931785cb73d520ac70a342a3dc16c249b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "414726b69921fe6355ae453f5b35e68dd078342a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "572ce62778519a7d4d1c15f55dd2e45a474133c4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499",
        "lessThan": "9ca562bb8e66978b53028fa32b1a190708e6a091",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/ip6_flowlabel.c"
    ],
    "versions": [
      {
        "version": "3.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.9",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.253",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.203",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.168",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.134",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.81",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.22",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.12",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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11 May 2026 22:13Current
CVSS 3.17.8
EPSS0.00121
26