{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43093", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.984Z", "datePublished": "2026-05-06T07:40:25.266Z", "dateUpdated": "2026-08-05T12:25:53.221Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:53.221Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: tighten UMEM headroom validation to account for tailroom and min frame\n\nThe current headroom validation in xdp_umem_reg() could leave us with\ninsufficient space dedicated to even receive minimum-sized ethernet\nframe. 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 metadata, making kernel/network path crashes or severe disruption plausible." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xdp/xdp_umem.c" ], "versions": [ { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "5f123bc278bf4e3283d8606321bebbfd299f4384", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "1a6051cd7e3e4c54ff3854a43b638b9292af5e67", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "8769708add9eadeea8041a9761771bb715a87104", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "a03975beb9f6af0d8ac051e30b2abeabe618414f", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "0ec4d3f6e6934deb843b561ae048cd17218e5ad1", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "6523bc1b40e69301f24c14338b762af4739d6d39", "status": "affected", "versionType": "git" }, { "version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02", "lessThan": "a315e022a72d95ef5f1d4e58e903cb492b0ad931", "status": "affected", "versionType": "git" }, { "version": "ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee", "status": "affected", "versionType": "git" }, { "version": "25c9cdef57488578da21d99eb614b97ffcf6e59f", "status": "affected", "versionType": "git" }, { "version": "98d3c852e63b49129515dd18c875999efaf8530a", "status": "affected", "versionType": "git" }, { "version": "4.19.118", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.35", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.6.7", "lessThan": "5.7", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/xdp/xdp_umem.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "5.7", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.19.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.118" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384" }, { "url": "https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67" }, { "url": "https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104" }, { "url": "https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f" }, { "url": "https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1" }, { "url": "https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12" }, { "url": "https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39" }, { "url": "https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931" } ], "title": "xsk: tighten UMEM headroom validation to account for tailroom and min frame", "x_generator": { "engine": "bippy-1.2.0" } } } }