CVE-2026-98101

{
  "id": "CVE-2026-98101",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:39.830",
  "lastModified": "2026-10-19T10:18:07.260",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: use copy-on-write RCU updates in ip6_mc_source()\n\npmc->sflist is read locklessly under rcu_read_lock() by\ninet6_mc_check() during packet reception in the UDP and RAW\nmulticast receive paths.\n\nip6_mc_source() mutated psl->sl_addr and psl->sl_count in-place\nwhen adding or removing a source filter. Additionally, when expanding\nthe filter buffer, newpsl was published via rcu_assign_pointer()\nbefore writing the new source into the array.\n\nBecause 16-byte struct in6_addr writes are not atomic and array\nshifting is not synchronized with RCU readers, concurrent readers in\ninet6_mc_check() could read torn IPv6 addresses or observe\nduplicated/missed source entries.\n\nFix this by switching ip6_mc_source() to copy-on-write RCU updates:\nallocate and fully populate newpsl before publishing it via\nrcu_assign_pointer(), and reclaim the old filter via kfree_rcu(),\nmatching ip6_mc_msfilter().\n\nAlso remove the now unused IP6_SFBLOCK macro."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "include/net/if_inet6.h",
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "882ba1f73c06831f2a21044ebd8864c485ac04f2",
              "lessThan": "ac51321d3b2391860a935820ebcf4d8b9bb16a8a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "882ba1f73c06831f2a21044ebd8864c485ac04f2",
              "lessThan": "dba00514bf668c26cb4900e9f0da84bf96bf065a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "882ba1f73c06831f2a21044ebd8864c485ac04f2",
              "lessThan": "2c2091e2ee93049fc513ad1e6c99d8b6c809f467",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "882ba1f73c06831f2a21044ebd8864c485ac04f2",
              "lessThan": "20db91a052332ef5552bd2f651ffb9db911cf67b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "882ba1f73c06831f2a21044ebd8864c485ac04f2",
              "lessThan": "c073d1b070f171d206b19c98d71739a97f15b3f1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "47c75e3923c8d562fea8daf0ccf31546a7bef0ea",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.10.261",
              "lessThan": "5.11",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "include/net/if_inet6.h",
            "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": "6.12.112",
              "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/20db91a052332ef5552bd2f651ffb9db911cf67b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2c2091e2ee93049fc513ad1e6c99d8b6c809f467",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ac51321d3b2391860a935820ebcf4d8b9bb16a8a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c073d1b070f171d206b19c98d71739a97f15b3f1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dba00514bf668c26cb4900e9f0da84bf96bf065a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}