CVE-2026-98102

{
  "id": "CVE-2026-98102",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:39.943",
  "lastModified": "2026-10-19T10:18:07.420",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "lessThan": "c3343cd7ec8706c221e52b782f386b9af14a928a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.10.261",
              "lessThan": "5.11",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.13",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.111",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}