{"id":"CVE-2026-43093","state":"PUBLISHED","title":"xsk: tighten UMEM headroom validation to account for tailroom and min frame","description":"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.","publishedAt":"2026-05-06T07:40:25.266Z","updatedAt":"2026-10-19T19:06:13.475Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"5f123bc278bf4e3283d8606321bebbfd299f4384","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"1a6051cd7e3e4c54ff3854a43b638b9292af5e67","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"8769708add9eadeea8041a9761771bb715a87104","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"a03975beb9f6af0d8ac051e30b2abeabe618414f","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"0ec4d3f6e6934deb843b561ae048cd17218e5ad1","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"6523bc1b40e69301f24c14338b762af4739d6d39","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"a315e022a72d95ef5f1d4e58e903cb492b0ad931","versionType":"git"},{"version":"ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee","status":"affected","versionType":"git"},{"version":"25c9cdef57488578da21d99eb614b97ffcf6e59f","status":"affected","versionType":"git"},{"version":"98d3c852e63b49129515dd18c875999efaf8530a","status":"affected","versionType":"git"},{"version":"4.19.118","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.35","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.6.7","status":"affected","lessThan":"5.7","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xdp/xdp_umem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xdp/xdp_umem.c"]}],"references":["https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384","https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67","https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104","https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f","https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1","https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12","https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39","https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43093.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43093","state":"PUBLISHED","datePublished":"2026-05-06T07:40:25.266Z","dateUpdated":"2026-10-19T19:06:13.475Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.984Z"},"containers":{"cna":{"title":"xsk: tighten UMEM headroom validation to account for tailroom and min frame","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"5f123bc278bf4e3283d8606321bebbfd299f4384","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"1a6051cd7e3e4c54ff3854a43b638b9292af5e67","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"8769708add9eadeea8041a9761771bb715a87104","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"a03975beb9f6af0d8ac051e30b2abeabe618414f","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"0ec4d3f6e6934deb843b561ae048cd17218e5ad1","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"6523bc1b40e69301f24c14338b762af4739d6d39","versionType":"git"},{"version":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02","status":"affected","lessThan":"a315e022a72d95ef5f1d4e58e903cb492b0ad931","versionType":"git"},{"version":"ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee","status":"affected","versionType":"git"},{"version":"25c9cdef57488578da21d99eb614b97ffcf6e59f","status":"affected","versionType":"git"},{"version":"98d3c852e63b49129515dd18c875999efaf8530a","status":"affected","versionType":"git"},{"version":"4.19.118","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.35","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.6.7","status":"affected","lessThan":"5.7","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xdp/xdp_umem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xdp/xdp_umem.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:25:53.221Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:19:05.318Z"},"x_adpType":"supplier"},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43093","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:14:34.453140Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","type":"CWE","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:06:13.475Z"}}]}}}