FKIE_CVE-2026-98102

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
              "status": "affected",
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "versionType": "git"
            },
            {
              "lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
              "status": "affected",
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "versionType": "git"
            },
            {
              "lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
              "status": "affected",
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "versionType": "git"
            },
            {
              "lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
              "status": "affected",
              "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
              "versionType": "git"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.261",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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-\u003emca_sources. If the filter was previously active,\nthe code moved psf directly into pmc-\u003emca_tomb by updating psf-\u003esf_next.\n\nBecause pmc-\u003emca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf-\u003esf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc-\u003emca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc-\u003emca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu()."
    }
  ],
  "id": "CVE-2026-98102",
  "lastModified": "2026-09-25T11:17:39.943",
  "metrics": {},
  "published": "2026-09-25T11:17:39.943",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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