CVE-2025-37789

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The negative-length path is fully in-bounds and deterministic, and the actions are validated before the datapath lookup so not even a datapath must exist.\nPR:L - The OVS flow genl ops use GENL_UNS_ADMIN_PERM with .netnsok = true, so the CAP_NET_ADMIN check is scoped to the netns's owning user namespace and any unprivileged user can satisfy it with `unshare -Urn`. The openvswitch module is autoloaded from an unprivileged CTRL_CMD_GETFAMILY lookup via MODULE_ALIAS_GENL_FAMILY.\nUI:N - The attacker performs the entire sequence themselves via socket()/sendmsg(); no action by any other user or administrator is needed.\nS:U - The corruption is confined to kernel memory under the same security authority as the attacking process; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The bug produces out-of-bounds reads beyond the netlink skb \u2014 the KMSAN-confirmed header read, the unbounded forward scan in validate_masked() with a negative length, and a memcpy whose source is read for up to SIZE_MAX bytes. Data copied out of bounds lands in the flow's actions buffer, which is echoed back to userspace by OVS_FLOW_CMD_GET/DUMP, giving an arbitrary kernel-memory disclosure primitive.\nI:H - With key_len underflowing to (size_t)-1, `memcpy(nla_data(at), nla_data(ovs_key), key_len)` and the following `memset(..., 0xff, key_len)` perform an effectively unbounded out-of-bounds write over the kernel heap using attacker-influenced data. An out-of-bounds write of this scope is a full integrity compromise.\nA:H - The wild memcpy/memset will fault as soon as it walks off mapped memory, and the negative-length validate_masked() loop scans up to 4G of memory; either way the result is a kernel panic, and on sanitizer builds it is an immediate KASAN/KMSAN report. 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action\n\nIt's not safe to access nla_len(ovs_key) if the data is smaller than\nthe netlink header. Check that the attribute is OK first."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: openvswitch: correcci\u00f3n de la validaci\u00f3n de la longitud de la clave anidada en la acci\u00f3n set(). No es seguro acceder a nla_len(ovs_key) si los datos son menores que el encabezado netlink. Compruebe primero que el atributo est\u00e9 correcto."}], "id": "CVE-2025-37789", "lastModified": "2026-07-30T06:22:20.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-37789", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:41:41.618677Z", "version": "2.0.3"}}]}, "published": "2025-05-01T14:15:43.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03d7262dd53e8c404da35cc81aaa887fd901f76b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1489c195c8eecd262aa6712761ba5288203e28ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/54c6957d1123a2032099b9eab51c314800f677ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/65d91192aa66f05710cfddf6a14b5a25ee554dba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7fcaec0b2ab8fa5fbf0b45e5512364a168f445bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/824a7c2df5127b2402b68a21a265d413e78dcad7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a27526e6b48eee9e2d82efff502c4f272f1a91d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be80768d4f3b6fd13f421451cc3fee8778aba8bc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: openvswitch: fix nested key length validation in the set() action", "id": "2363315", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363315"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: openvswitch: fix nested key length validation in the set() action\nIt's not safe to access nla_len(ovs_key) if the data is smaller than\nthe netlink header. Check that the attribute is OK first."], "name": "CVE-2025-37789", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37789\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37789\nhttps://lore.kernel.org/linux-cve-announce/2025050119-CVE-2025-37789-3f0b@gregkh/T"], "threat_severity": "Moderate"}

{}