{"id":"CVE-2026-74710","state":"PUBLISHED","title":"xsk: require at least 16 bytes of TX metadata","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: require at least 16 bytes of TX metadata\n\nAF_XDP accepts a TX metadata length as small as eight bytes, but every\nsupported request needs the flags plus at least one eight-byte request\nfield. Such short metadata also lets the kernel read beyond the registered\narea.\n\nRequire 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve\ncompatibility with applications that do not use launch-time metadata.","publishedAt":"2026-08-22T15:33:07.172Z","updatedAt":"2026-10-16T19:16:11.065Z","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":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"21b8536aee819792f1b4b38b9aacf2a073025d49","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"642c6e73fce17fdca93a5793c4d22359fda866d7","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"cfb9d2976b277e554e28c165e3eff4b4a8ea10bd","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"1bb30b181d9f0484e141f8411e15ed906d5c6780","versionType":"git"}],"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":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/21b8536aee819792f1b4b38b9aacf2a073025d49","https://git.kernel.org/stable/c/642c6e73fce17fdca93a5793c4d22359fda866d7","https://git.kernel.org/stable/c/cfb9d2976b277e554e28c165e3eff4b4a8ea10bd","https://git.kernel.org/stable/c/1bb30b181d9f0484e141f8411e15ed906d5c6780"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74710.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74710","state":"PUBLISHED","datePublished":"2026-08-22T15:33:07.172Z","dateUpdated":"2026-10-16T19:16:11.065Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.928Z"},"containers":{"cna":{"title":"xsk: require at least 16 bytes of TX metadata","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: require at least 16 bytes of TX metadata\n\nAF_XDP accepts a TX metadata length as small as eight bytes, but every\nsupported request needs the flags plus at least one eight-byte request\nfield. Such short metadata also lets the kernel read beyond the registered\narea.\n\nRequire 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve\ncompatibility with applications that do not use launch-time metadata."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"21b8536aee819792f1b4b38b9aacf2a073025d49","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"642c6e73fce17fdca93a5793c4d22359fda866d7","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"cfb9d2976b277e554e28c165e3eff4b4a8ea10bd","versionType":"git"},{"version":"341ac980eab90ac1f6c22ee9f9da83ed9604d899","status":"affected","lessThan":"1bb30b181d9f0484e141f8411e15ed906d5c6780","versionType":"git"}],"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":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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/21b8536aee819792f1b4b38b9aacf2a073025d49"},{"url":"https://git.kernel.org/stable/c/642c6e73fce17fdca93a5793c4d22359fda866d7"},{"url":"https://git.kernel.org/stable/c/cfb9d2976b277e554e28c165e3eff4b4a8ea10bd"},{"url":"https://git.kernel.org/stable/c/1bb30b181d9f0484e141f8411e15ed906d5c6780"}],"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 bug is reached only through local AF_XDP setup—socket(AF_XDP), setsockopt(XDP_UMEM_REG) with tx_metadata_len=8, ring configuration, bind, and TX descriptor submission—not via remote packet handling or network-facing services.\nAC:L - The attacker fully controls tx_metadata_len, descriptor addresses, metadata flags, and TX timing, and can place frames at chunk boundaries to reliably trigger kernel reads/writes past the declared 8-byte metadata headroom.\nPR:L - AF_XDP socket creation requires CAP_NET_RAW (xsk_create()); per kernel CNA guidance this is Low because unprivileged processes can obtain it inside user/network namespaces (e.g., unshare -Urn).\nUI:N - No victim action is required; the attacker configures their own AF_XDP socket, UMEM, rings, and TX descriptors to trigger the faulty metadata handling during transmit.\nS:U - Impact is confined to kernel processing of attacker-supplied AF_XDP metadata and pinned UMEM frames; it does not cross VM, hypervisor, or IOMMU isolation boundaries.\nC:H - With only 8 bytes registered, the kernel still dereferences xsk_tx_metadata request fields (checksum, launch time) beyond the metadata area; this out-of-bounds read can cross chunk/UMEM boundaries and expose adjacent memory.\nI:H - TX timestamp completion writes through meta->completion.tx_timestamp when only 8 bytes of metadata were reserved, causing an out-of-bounds write past the registered metadata headroom that can corrupt adjacent memory or be leveraged further.\nA:H - Reading or writing metadata fields beyond the registered length at chunk/UMEM edges can access unmapped pages and trigger kernel faults; out-of-bounds kernel accesses in this path can cause oops/panic-level denial of service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-25T05:41:52.464Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74710","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:15:16.370467Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:16:11.065Z"}}]}}}