CVE-2026-64096 (GCVE-0-2026-64096)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
batman-adv: mcast: fix use-after-free in orig_node RCU release
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < ff3a4487ead475e27b43280b8ee3d8464fe280e1 (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < 78a63fb2f7d5630d1c1f2859a20d4e4226863b41 (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < ced48f55bac73f0822eae90509e51b42b4f646c8 (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < 70bcb678561f0fb58f33270fc73f12f3be72b878 (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < aef897c9d2dd0d9339167fb82b62beff68d076cb (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < 8a3707653ab658e082ccd992e92594e01b09a3fc (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < edfb1e094104a50f931553dc82ac59246569fd32 (git)
Affected: ab49886e3da73b6b35ece21006e191910427bb30 , < 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc (git)
Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-64096",
    "datePublished": "2026-07-19T15:40:02.969Z",
    "dateReserved": "2026-07-19T07:54:57.033Z",
    "dateUpdated": "2026-07-20T13:43:16.405Z",
    "state": "PUBLISHED"
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This ensures RCU readers that were\\nactive at purge time have drained before the orig_node memory is reclaimed.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/originator.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"ff3a4487ead475e27b43280b8ee3d8464fe280e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"78a63fb2f7d5630d1c1f2859a20d4e4226863b41\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"ced48f55bac73f0822eae90509e51b42b4f646c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"70bcb678561f0fb58f33270fc73f12f3be72b878\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"aef897c9d2dd0d9339167fb82b62beff68d076cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"8a3707653ab658e082ccd992e92594e01b09a3fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"edfb1e094104a50f931553dc82ac59246569fd32\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab49886e3da73b6b35ece21006e191910427bb30\",\"lessThan\":\"20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/originator.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T09:07:35+00:00",
      "cve": "CVE-2026-64096",
      "id": "CVE-2026-64096",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: mcast: fix use-after-free in orig_node RCU release",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64096.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.