CVE-2026-43093

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Furthermore if multi-buffer would come to play then\nskb_shared_info stored at the end of XSK frame would be corrupted.\n\nHW typically works with 128-aligned sizes so let us provide this value\nas bare minimum.\n\nMulti-buffer setting is known later in the configuration process so\nbesides accounting for 128 bytes, let us also take care of tailroom space\nupfront."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable UMEM headroom value is supplied through local AF_XDP socket setup via socket(), setsockopt(SOL_XDP, XDP_UMEM_REG), and bind(); network packets may later exercise the bad layout, but they do not create it.\nAC:L - The attacker controls the UMEM chunk size/headroom and AF_XDP setup parameters, and no race or rare timing condition is required.\nPR:L - AF_XDP socket creation requires CAP_NET_RAW in the network namespace and related XDP/BPF setup uses namespace-capable networking privileges, which are reachable by a low-privileged local user through user namespaces in reasonable configurations.\nUI:N - No victim action is needed once the attacker can run the local setup and drive traffic through the socket.\nS:U - The impact remains within the kernel/networking security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The invalid UMEM geometry can corrupt skb_shared_info/fragment metadata consumed by kernel XDP/AF_XDP paths; under the required overestimation rule, this kernel metadata corruption is treated as capable of enabling high-impact information disclosure.\nI:H - The bug permits attacker-controlled layout overlap with kernel-used XDP fragment metadata, creating a plausible memory-corruption primitive rather than a mere validation failure.\nA:H - Malformed AF_XDP receive geometry can leave insufficient space even for minimum frames and corrupt multi-buffer 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The vulnerable UMEM headroom value is supplied through local AF_XDP socket setup via socket(), setsockopt(SOL_XDP, XDP_UMEM_REG), and bind(); network packets may later exercise the bad layout, but they do not create it.\nAC:L - The attacker controls the UMEM chunk size/headroom and AF_XDP setup parameters, and no race or rare timing condition is required.\nPR:L - AF_XDP socket creation requires CAP_NET_RAW in the network namespace and related XDP/BPF setup uses namespace-capable networking privileges, which are reachable by a low-privileged local user through user namespaces in reasonable configurations.\nUI:N - No victim action is needed once the attacker can run the local setup and drive traffic through the socket.\nS:U - The impact remains within the kernel/networking security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The invalid UMEM geometry can corrupt skb_shared_info/fragment metadata consumed by kernel XDP/AF_XDP paths; under the required overestimation rule, this kernel metadata corruption is treated as capable of enabling high-impact information disclosure.\nI:H - 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Furthermore if multi-buffer would come to play then\nskb_shared_info stored at the end of XSK frame would be corrupted.\n\nHW typically works with 128-aligned sizes so let us provide this value\nas bare minimum.\n\nMulti-buffer setting is known later in the configuration process so\nbesides accounting for 128 bytes, let us also take care of tailroom space\nupfront."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxsk: ajustar la validaci\u00f3n del espacio de cabecera de UMEM para tener en cuenta el espacio de cola y el marco m\u00ednimo\n\nLa validaci\u00f3n actual del espacio de cabecera en xdp_umem_reg() podr\u00eda dejarnos con espacio insuficiente dedicado incluso para recibir un marco Ethernet de tama\u00f1o m\u00ednimo. Adem\u00e1s, si el multi-buffer entrara en juego, entonces skb_shared_info almacenado al final del marco XSK se corromper\u00eda.\n\nEl hardware t\u00edpicamente trabaja con tama\u00f1os alineados a 128, as\u00ed que proporcionemos este valor como m\u00ednimo indispensable.\n\nLa configuraci\u00f3n del multi-buffer se conoce m\u00e1s tarde en el proceso de configuraci\u00f3n, as\u00ed que adem\u00e1s de tener en cuenta 128 bytes, ocup\u00e9monos tambi\u00e9n del espacio de cola de antemano."}], "id": "CVE-2026-43093", "lastModified": "2026-11-11T21:10:00.200", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43093", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:14:34.453140Z", "version": "2.0.3"}}]}, "published": "2026-05-06T10:16:22.667", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xsk: tighten UMEM headroom validation to account for tailroom and min frame", "id": "2467004", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467004"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["A flaw was found in the Linux kernel's xsk (AF_XDP) subsystem due to insufficient validation of the User Memory (UMEM) headroom. This vulnerability could lead to memory corruption, specifically the `skb_shared_info` data structure, if multi-buffer is enabled. Such corruption could result in system instability or a denial of service. Additionally, the flaw could cause insufficient space for minimum-sized Ethernet frames."], "name": "CVE-2026-43093", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43093\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43093\nhttps://lore.kernel.org/linux-cve-announce/2026050618-CVE-2026-43093-2e91@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99e3a236dd43d06c65af0a2ef9cb44306aef6e02,a03975beb9f6af0d8ac051e30b2abeabe618414f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99e3a236dd43d06c65af0a2ef9cb44306aef6e02,0ec4d3f6e6934deb843b561ae048cd17218e5ad1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99e3a236dd43d06c65af0a2ef9cb44306aef6e02,9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99e3a236dd43d06c65af0a2ef9cb44306aef6e02,6523bc1b40e69301f24c14338b762af4739d6d39)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99e3a236dd43d06c65af0a2ef9cb44306aef6e02,a315e022a72d95ef5f1d4e58e903cb492b0ad931)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "25c9cdef57488578da21d99eb614b97ffcf6e59f"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "98d3c852e63b49129515dd18c875999efaf8530a"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.136,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.83,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T12:00:03.492599+00:00", "updated": "2026-10-23T08:30:09.477056+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}