CVE-2026-98102 (GCVE-0-2026-98102)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:35 – Updated: 2026-09-25 10:35
VLAI
Title
ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4b200e398953c237c86d32bf26d4cb2a96556a6f , < 4352737297b262e8367675c19a7dc6a9f53c97af (git)
Affected: 4b200e398953c237c86d32bf26d4cb2a96556a6f , < 8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4 (git)
Affected: 4b200e398953c237c86d32bf26d4cb2a96556a6f , < 5149c60c406595b56fda0c6e9aae7fd287f636aa (git)
Affected: 4b200e398953c237c86d32bf26d4cb2a96556a6f , < 93b49239840b91313adbd77b8b52993eff2d08c1 (git)
Affected: 86c49119f0353f857cc08030ec9e4ebaab3d5a64 (git)
Affected: 5.10.261 , < 5.11 (semver)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
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              "versionType": "git"
            },
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              "versionType": "git"
            },
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              "versionType": "semver"
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              "version": "6.18.53",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
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                },
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                },
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              "negate": false,
              "operator": "OR"
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      ],
      "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:35:53.332Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"
        },
        {
          "url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"
        }
      ],
      "title": "ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98102",
    "datePublished": "2026-09-25T10:35:53.332Z",
    "dateReserved": "2026-09-25T10:25:14.315Z",
    "dateUpdated": "2026-09-25T10:35:53.332Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
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                "product": "Linux",
                "programFiles": [
                  "net/ipv6/mcast.c"
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                    "versionType": "git"
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                "vendor": "Linux",
                "versions": [
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                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
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                    "versionType": "semver"
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                    "versionType": "semver"
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            ],
            "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",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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