CVE-2025-68341

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-68341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T14:48:05.298Z", "datePublished": "2025-12-23T13:58:26.749Z", "dateUpdated": "2026-08-05T12:10:57.506Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:10:57.506Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: reduce XDP no_direct return section to fix race\n\nAs explain in commit fa349e396e48 (\"veth: Fix race with AF_XDP exposing\nold or uninitialized descriptors\") for veth there is a chance after\nnapi_complete_done() that another CPU can manage start another NAPI\ninstance running veth_pool(). For NAPI this is correctly handled as the\nnapi_schedule_prep() check will prevent multiple instances from getting\nscheduled, but for the remaining code in veth_pool() this can run\nconcurrent with the newly started NAPI instance.\n\nThe problem/race is that xdp_clear_return_frame_no_direct() isn't\ndesigned to be nested.\n\nPrior to commit 401cb7dae813 (\"net: Reference bpf_redirect_info via\ntask_struct on PREEMPT_RT.\") the temporary BPF net context\nbpf_redirect_info was stored per CPU, where this wasn't an issue. Since\nthis commit the BPF context is stored in 'current' task_struct. When\nrunning veth in threaded-NAPI mode, then the kthread becomes the storage\narea. Now a race exists between two concurrent veth_pool() function calls\none exiting NAPI and one running new NAPI, both using the same BPF net\ncontext.\n\nRace is when another CPU gets within the xdp_set_return_frame_no_direct()\nsection before exiting veth_pool() calls the clear-function\nxdp_clear_return_frame_no_direct()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - Unauthenticated packets received by a physical NIC can be XDP-redirected through a veth into the vulnerable threaded-NAPI path; no local access is needed to supply or time those packets.\nAC:L - Once veth XDP and threaded NAPI are configured, an attacker can repeatedly create the completion/rescheduling race using sustained or paced packet traffic.\nPR:N - The XDP topology requires administrative setup, but subsequent packet processing has no authentication or capability check, and the remote attacker needs no privileges.\nUI:N - Packets automatically traverse NIC XDP, veth queuing, threaded NAPI polling, and page return without victim interaction.\nS:U - The resulting memory corruption affects the host kernel within its existing security authority and does not inherently cross a VM, IOMMU, or equivalent boundary.\nC:H - The premature flag clear permits concurrent lockless page-pool recycling, potentially duplicating or stale-reusing pages and causing UAF-class corruption capable of exposing arbitrary kernel memory.\nI:H - The page-pool corruption can hand out a page multiple times and enable attacker-influenced writes into reused memory, making arbitrary writes or control-flow compromise defensible.\nA:H - Production failures resembling use-after-free were reported, and corrupted or multiply reused page-pool pages can cause kernel faults, panic, or persistent packet-processing failure."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/veth.c"], "versions": [{"version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "lessThan": "c1ceabcb347d1b0f7e70a7384ec7eff3847b7628", "status": "affected", "versionType": "git"}, {"version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "lessThan": "d0bd018ad72a8a598ae709588934135017f8af52", "status": "affected", "versionType": "git"}, {"version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "lessThan": "a14602fcae17a3f1cb8a8521bedf31728f9e7e39", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/veth.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.61", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.11", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.17.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c1ceabcb347d1b0f7e70a7384ec7eff3847b7628"}, {"url": "https://git.kernel.org/stable/c/d0bd018ad72a8a598ae709588934135017f8af52"}, {"url": "https://git.kernel.org/stable/c/a14602fcae17a3f1cb8a8521bedf31728f9e7e39"}], "title": "veth: reduce XDP no_direct return section to fix race", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/veth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c1ceabcb347d1b0f7e70a7384ec7eff3847b7628", "status": "affected", "version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "versionType": "git"}, {"lessThan": "d0bd018ad72a8a598ae709588934135017f8af52", "status": "affected", "version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "versionType": "git"}, {"lessThan": "a14602fcae17a3f1cb8a8521bedf31728f9e7e39", "status": "affected", "version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/veth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.61", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "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\nveth: reduce XDP no_direct return section to fix race\n\nAs explain in commit fa349e396e48 (\"veth: Fix race with AF_XDP exposing\nold or uninitialized descriptors\") for veth there is a chance after\nnapi_complete_done() that another CPU can manage start another NAPI\ninstance running veth_pool(). For NAPI this is correctly handled as the\nnapi_schedule_prep() check will prevent multiple instances from getting\nscheduled, but for the remaining code in veth_pool() this can run\nconcurrent with the newly started NAPI instance.\n\nThe problem/race is that xdp_clear_return_frame_no_direct() isn't\ndesigned to be nested.\n\nPrior to commit 401cb7dae813 (\"net: Reference bpf_redirect_info via\ntask_struct on PREEMPT_RT.\") the temporary BPF net context\nbpf_redirect_info was stored per CPU, where this wasn't an issue. Since\nthis commit the BPF context is stored in 'current' task_struct. When\nrunning veth in threaded-NAPI mode, then the kthread becomes the storage\narea. Now a race exists between two concurrent veth_pool() function calls\none exiting NAPI and one running new NAPI, both using the same BPF net\ncontext.\n\nRace is when another CPU gets within the xdp_set_return_frame_no_direct()\nsection before exiting veth_pool() calls the clear-function\nxdp_clear_return_frame_no_direct()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\\n\\nveth: reducir la secci\u00f3n de retorno no_direct de XDP para corregir la condici\u00f3n de carrera\\n\\nComo se explica en el commit fa349e396e48 ('veth: Fix race with AF_XDP exposing old or uninitialized descriptors') para veth, existe la posibilidad de que, despu\u00e9s de napi_complete_done(), otra CPU inicie otra instancia NAPI ejecutando veth_pool(). Para NAPI esto se maneja correctamente, ya que la verificaci\u00f3n napi_schedule_prep() impedir\u00e1 que se programen m\u00faltiples instancias, pero el c\u00f3digo restante en veth_pool() puede ejecutarse concurrentemente con la nueva instancia NAPI iniciada.\\n\\nEl problema/condici\u00f3n de carrera es que xdp_clear_return_frame_no_direct() no est\u00e1 dise\u00f1ada para ser anidada.\\n\\nVersiones anteriores al commit 401cb7dae813 ('net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.') el contexto temporal de red BPF bpf_redirect_info se almacenaba por CPU, donde esto no era un problema. Desde este commit, el contexto BPF se almacena en la estructura task_struct de 'current'. Al ejecutar veth en modo threaded?NAPI, el kthread se convierte en el \u00e1rea de almacenamiento. Ahora existe una condici\u00f3n de carrera entre dos llamadas concurrentes a la funci\u00f3n veth_pool(): una que est\u00e1 saliendo de NAPI y otra que est\u00e1 iniciando una nueva NAPI, ambas usando el mismo contexto de red BPF.\\n\\nLa condici\u00f3n de carrera ocurre cuando otra CPU entra en la secci\u00f3n xdp_set_return_frame_no_direct() antes de que la llamada que est\u00e1 saliendo de veth_pool() ejecute la funci\u00f3n de borrado xdp_clear_return_frame_no_direct()."}], "id": "CVE-2025-68341", "lastModified": "2026-10-19T21:10:00.160", "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"}]}, "published": "2025-12-23T14:16:40.683", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a14602fcae17a3f1cb8a8521bedf31728f9e7e39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1ceabcb347d1b0f7e70a7384ec7eff3847b7628"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0bd018ad72a8a598ae709588934135017f8af52"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: veth: reduce XDP no_direct return section to fix race", "id": "2424611", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2424611"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-68341", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "2025-12-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68341\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68341\nhttps://lore.kernel.org/linux-cve-announce/2025122332-CVE-2025-68341-c207@gregkh/T"], "threat_severity": "Low"}

{}