CVE-2026-31657

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In a multi-hop batman-adv deployment, a remote mesh peer can drive the packet paths that update and read the claim.\nAC:L - Although this is a race, the attacker can control both sides by flooding claim ownership changes and packets that trigger the claim readers. No special memory layout or victim timing condition beyond attacker-induced concurrency is required.\nPR:N - The packet receive path has no authentication or privilege check for a peer already able to send batman-adv mesh traffic. The netlink dump path has a CAP_NET_ADMIN-in-netns gate, but the packet-triggered path does not require local privileges.\nUI:N - No user action is required once the affected batman-adv mesh interface and default BLA/DAT features are active. The attacker only needs to send crafted/concurrent network traffic.\nS:U - The impact is within the Linux kernel on the vulnerable host. It does not cross a separate hypervisor, guest/host, or hardware-enforced security authority boundary.\nC:H - This is a use-after-free of a kernel heap `batadv_bla_backbone_gw` object, with readers accessing fields after the object can be freed and reused. Such UAF conditions are defensibly treated as enabling high confidentiality impact.\nI:H - The stale object includes a spinlock and mutable state, so dereferencing and locking freed/reused memory can corrupt kernel heap state. A kernel UAF is also potentially exploitable for write/control-flow primitives.\nA:H - The stale pointer can lead to invalid dereferences or spinlock operations on freed memory, causing kernel oops, panic, or hang. Repeated network traffic can retrigger the condition."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/bridge_loop_avoidance.c"], "versions": [{"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "5202f071b367ffbc8e279fc7a00db14f5e587f52", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "69d1ce9c72eca91203ffdb8d08bacd511100aec6", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "f4858832ddef2f39f21e30b7226bbcd3c4b2bc96", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "2f55b58b5a0bbed192d60c444a45a49cdf1b545f", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": 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"7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52"}, {"url": "https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6"}, {"url": "https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96"}, {"url": "https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f"}, {"url": "https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd"}, {"url": "https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35"}, {"url": "https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b"}, {"url": "https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2"}], "title": "batman-adv: hold claim backbone gateways by reference", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31657", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, 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In a multi-hop batman-adv deployment, a remote mesh peer can drive the packet paths that update and read the claim.\nAC:L - Although this is a race, the attacker can control both sides by flooding claim ownership changes and packets that trigger the claim readers. No special memory layout or victim timing condition beyond attacker-induced concurrency is required.\nPR:N - The packet receive path has no authentication or privilege check for a peer already able to send batman-adv mesh traffic. The netlink dump path has a CAP_NET_ADMIN-in-netns gate, but the packet-triggered path does not require local privileges.\nUI:N - No user action is required once the affected batman-adv mesh interface and default BLA/DAT features are active. The attacker only needs to send crafted/concurrent network traffic.\nS:U - The impact is within the Linux kernel on the vulnerable host. It does not cross a separate hypervisor, guest/host, or hardware-enforced security authority boundary.\nC:H - This is a use-after-free of a kernel heap `batadv_bla_backbone_gw` object, with readers accessing fields after the object can be freed and reused. Such UAF conditions are defensibly treated as enabling high confidentiality impact.\nI:H - The stale object includes a spinlock and mutable state, so dereferencing and locking freed/reused memory can corrupt kernel heap state. A kernel UAF is also potentially exploitable for write/control-flow primitives.\nA:H - The stale pointer can lead to invalid dereferences or spinlock operations on freed memory, causing kernel oops, panic, or hang. Repeated network traffic can retrigger the condition."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/bridge_loop_avoidance.c"], "versions": [{"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "5202f071b367ffbc8e279fc7a00db14f5e587f52", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "69d1ce9c72eca91203ffdb8d08bacd511100aec6", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "f4858832ddef2f39f21e30b7226bbcd3c4b2bc96", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "2f55b58b5a0bbed192d60c444a45a49cdf1b545f", "status": "affected", "versionType": "git"}, {"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": 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"vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: hold claim backbone gateways by reference\n\nbatadv_bla_add_claim() can replace claim->backbone_gw and drop the old\ngateway's last reference while readers still follow the pointer.\n\nThe netlink claim dump path dereferences claim->backbone_gw->orig and\ntakes claim->backbone_gw->crc_lock without pinning the underlying\nbackbone gateway. batadv_bla_check_claim() still has the same naked\npointer access pattern.\n\nReuse batadv_bla_claim_get_backbone_gw() in both readers so they operate\non a stable gateway reference until the read-side work is complete.\nThis keeps the dump and claim-check paths aligned with the lifetime\nrules introduced for the other BLA claim readers."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbatman-adv: mantener las pasarelas troncales de reclamo por referencia\n\nbatadv_bla_add_claim() puede reemplazar claim -> backbone_gw y liberar la \u00faltima referencia de la pasarela antigua mientras los lectores a\u00fan siguen el puntero.\n\nLa ruta de volcado de reclamo de netlink desreferencia claim -> backbone_gw -> orig y toma claim -> backbone_gw -> crc_lock sin fijar la pasarela troncal subyacente. batadv_bla_check_claim() a\u00fan tiene el mismo patr\u00f3n de acceso de puntero desnudo.\n\nReutilizar batadv_bla_claim_get_backbone_gw() en ambos lectores para que operen en una referencia de pasarela estable hasta que el trabajo del lado de lectura est\u00e9 completo. Esto mantiene las rutas de volcado y de verificaci\u00f3n de reclamo alineadas con las reglas de vida \u00fatil introducidas para los otros lectores de reclamo BLA."}], "id": "CVE-2026-31657", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31657", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:11:37.875669Z", "version": "2.0.3"}}]}, "published": "2026-04-24T15:16:45.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: batman-adv: hold claim backbone gateways by reference", "id": "2461519", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461519"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's batman-adv component. The batadv_bla_add_claim() function can improperly drop a reference to a backbone gateway while other parts of the code, such as the netlink claim dump path, still hold and attempt to use a pointer to the freed memory. This creates a use-after-free vulnerability, which could allow a local attacker to cause system instability or a denial of service (DoS)."], "name": "CVE-2026-31657", "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"}], "public_date": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31657\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31657\nhttps://lore.kernel.org/linux-cve-announce/2026042402-CVE-2026-31657-fbab@gregkh/T"]}

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