{"id":"CVE-2026-97994","revision":"11cbbc7244fb4f30860855caae56e413","records":[{"revision":"11cbbc7244fb4f30860855caae56e413","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97994","aliases":[],"title":"vhost/vdpa: reject VRING_NUM larger than device max","description":"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.","state":0,"publishedAt":"2026-09-25T10:23:25.719+00:00","modifiedAt":"2026-10-19T09:12:01.173+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vhost/vdpa.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4c8cf31885f69e86be0b5b9e6677a26797365e1d\",\n                            \"lessThan\": \"4875c65ca53797a0a402fe2bb54d1b12f28b3cda\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4c8cf31885f69e86be0b5b9e6677a26797365e1d\",\n                            \"lessThan\": \"1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4c8cf31885f69e86be0b5b9e6677a26797365e1d\",\n                            \"lessThan\": \"68232102f20fc961327fb9e0f605a7eaadf030a9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4c8cf31885f69e86be0b5b9e6677a26797365e1d\",\n                            \"lessThan\": \"59522639a7d71cff4e20d594d0b9ea30dd0c77e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4c8cf31885f69e86be0b5b9e6677a26797365e1d\",\n                            \"lessThan\": \"ccb1dc7c527f8c925925cf92afc76ae590dac311\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vhost/vdpa.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/4875c65ca53797a0a402fe2bb54d1b12f28b3cda","https://git.kernel.org/stable/c/1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4","https://git.kernel.org/stable/c/68232102f20fc961327fb9e0f605a7eaadf030a9","https://git.kernel.org/stable/c/59522639a7d71cff4e20d594d0b9ea30dd0c77e0","https://git.kernel.org/stable/c/ccb1dc7c527f8c925925cf92afc76ae590dac311"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97994","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97994","identifiers":["CVE-2026-97994"]},"retained":false,"historicalAffected":[]}],"coverage":[]}