FKIE_CVE-2026-64096

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
Severity
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. Concurrent RCU readers may still accesses references to those entries at the point of removal. RCU-protected readers trying to operate on entries like orig->mcast_want_all_ipv6_node will then access already freed memory. Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(), just before the call_rcu() invocation. This ensures RCU readers that were active at purge time have drained before the orig_node memory is reclaimed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/originator.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ff3a4487ead475e27b43280b8ee3d8464fe280e1",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "78a63fb2f7d5630d1c1f2859a20d4e4226863b41",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "ced48f55bac73f0822eae90509e51b42b4f646c8",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "70bcb678561f0fb58f33270fc73f12f3be72b878",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "aef897c9d2dd0d9339167fb82b62beff68d076cb",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "8a3707653ab658e082ccd992e92594e01b09a3fc",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "edfb1e094104a50f931553dc82ac59246569fd32",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            },
            {
              "lessThan": "20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc",
              "status": "affected",
              "version": "ab49886e3da73b6b35ece21006e191910427bb30",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/originator.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.15"
            },
            {
              "lessThan": "3.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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\nbatman-adv: mcast: fix use-after-free in orig_node RCU release\n\nbatadv_mcast_purge_orig() removes entries from RCU-protected hlists but\ndoes not wait for an RCU grace period before returning. Concurrent RCU\nreaders may still accesses references to those entries at the point of\nremoval. RCU-protected readers trying to operate on entries like\norig-\u003emcast_want_all_ipv6_node will then access already freed memory.\n\nFix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(),\njust before the call_rcu() invocation. This ensures RCU readers that were\nactive at purge time have drained before the orig_node memory is reclaimed."
    }
  ],
  "id": "CVE-2026-64096",
  "lastModified": "2026-07-20T15:17:08.673",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:50.600",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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