{"schema":"threatline.record/2","record":{"id":"CVE-2026-97994","aliases":[],"summary":"vhost/vdpa: reject VRING_NUM larger than device max","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost/vdpa: reject VRING_NUM larger than device max\n\nvhost_vring_set_num() accepts any non-zero power-of-two queue size that\nfits in 16 bits. vhost-vdpa then passes that value to set_vq_num()\nwithout comparing it with get_vq_num_max().\n\nA process with access to /dev/vhost-vdpa-* can therefore configure a\nqueue larger than the device advertises. With vdpa_sim, the worker can\nwalk descriptors beyond the mapped descriptor ring. KASAN reports a\n16-byte out-of-bounds read, corresponding to one vring_desc, in the\nvringh IOTLB path:\n\n  BUG: KASAN: out-of-bounds in _copy_from_iter\n  Read of size 16\n  copy_from_iotlb\n  copydesc_iotlb\n  vringh_getdesc_iotlb\n  vdpasim_net_work\n\nCache get_vq_num_max() immediately after reset. Some backends derive\nit from writable queue-size state, so querying it after SET_NUM may\nreturn the current size instead of the device capability. Invalidate\nthe cached value before reset so a failed reset leaves SET_NUM\ndisabled.\n\nFor VHOST_SET_VRING_NUM, copy the complete vring state once and use\nthe same index and size for validation, vq->num, and set_vq_num().\nThis ensures that validation and use operate on the same copied values.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4c8cf31885f69e86be0b5b9e6677a26797365e1d","lessThan":"4875c65ca53797a0a402fe2bb54d1b12f28b3cda","status":"affected","versionType":"git"},{"version":"4c8cf31885f69e86be0b5b9e6677a26797365e1d","lessThan":"1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4","status":"affected","versionType":"git"},{"version":"4c8cf31885f69e86be0b5b9e6677a26797365e1d","lessThan":"68232102f20fc961327fb9e0f605a7eaadf030a9","status":"affected","versionType":"git"},{"version":"4c8cf31885f69e86be0b5b9e6677a26797365e1d","lessThan":"59522639a7d71cff4e20d594d0b9ea30dd0c77e0","status":"affected","versionType":"git"},{"version":"4c8cf31885f69e86be0b5b9e6677a26797365e1d","lessThan":"ccb1dc7c527f8c925925cf92afc76ae590dac311","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.7","status":"affected"},{"version":"0","lessThan":"5.7","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4875c65ca53797a0a402fe2bb54d1b12f28b3cda","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"68232102f20fc961327fb9e0f605a7eaadf030a9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","source_modified_at":"2026-10-19T09:12:01.173Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"59522639a7d71cff4e20d594d0b9ea30dd0c77e0","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09338,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:25.719Z","modified_at":"2026-10-19T09:12:01.173Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97994","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:12:01.173Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97994","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4875c65ca53797a0a402fe2bb54d1b12f28b3cda"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/68232102f20fc961327fb9e0f605a7eaadf030a9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/59522639a7d71cff4e20d594d0b9ea30dd0c77e0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ccb1dc7c527f8c925925cf92afc76ae590dac311"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:12:01.173Z","content_hash":"b7fd17de8219f611866a80d6b23109ba5b7fca0a8dc1e645e5feda2c887eb845"}}