CVE-2026-64096

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RCU-protected readers trying to operate on entries like\norig->mcast_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."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:A - Exploitation requires injecting BATMAN-adv protocol frames onto the victim's mesh segment (typically WiFi or wired L2 mesh), reachable only from adjacent mesh peers rather than arbitrary remote Internet hosts.\nAC:L - An attacker on the mesh controls both sides of the race by registering an originator with multicast flags via OGMs, ceasing heartbeats to trigger purge, and flooding IPv6 multicast to drive RCU readers in batadv_mcast_forw_want_all_ipv6().\nPR:N - No local privileges on the victim are required; a rogue mesh peer can send OGMs and multicast traffic that drive originator creation, timeout purge, and concurrent RCU list traversal without authentication.\nUI:N - Exploitation is fully automated through mesh protocol packet exchange and does not require any action from a local user or administrator on the victim node.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security boundary and does not cross into other VMs, containers, or hardware isolation domains.\nC:H - The use-after-free on batadv_orig_node allows concurrent RCU readers to dereference freed memory containing orig->mcast_want_all_ipv6_node and related fields, enabling arbitrary kernel memory disclosure.\nI:H - Use-after-free of the orig_node structure provides attacker-influencable freed heap slots that can be leveraged for arbitrary kernel writes and potential code execution via heap grooming.\nA:H - Concurrent access to freed orig_node memory during RCU list traversal can cause kernel oops or panic, and UAF conditions inherently threaten system availability even before full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", 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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->mcast_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": "2026-08-11T16:10:37.097", "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", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: mcast: fix use-after-free in orig_node RCU release", "id": "2502583", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502583"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the `batman-adv` (Better Approach To Mobile Ad-hoc Networking) multicast (mcast) module of the Linux kernel. The `batadv_mcast_purge_orig()` function removes entries from RCU (Read-Copy-Update)-protected lists without ensuring that all active readers have finished accessing those entries. This can lead to a use-after-free vulnerability, where concurrent operations may attempt to access memory that has already been released, potentially causing system instability or a denial of service."], "name": "CVE-2026-64096", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64096\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64096\nhttps://lore.kernel.org/linux-cve-announce/2026071919-CVE-2026-64096-f0fd@gregkh/T"]}

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