{"id":"CVE-2026-99097","summary":"tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()\n\ntee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size\nand passes it to alloc_pages_exact() without checking it. For size == 0\nnr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is\ndocumented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page\nallocator then trips its order \u003e MAX_PAGE_ORDER warning and fails the\nallocation; on a panic_on_warn kernel that ends the boot.\n\nThis can be triggered by TEE_IOC_SHM_ALLOC with struct\ntee_ioctl_shm_alloc_data where size is 0.\n\nReject a zero page count, as register_shm_helper() already does for the\nregister path.","modified":"2026-10-28T02:48:55.243859662Z","published":"2026-10-26T14:52:03.824Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99097.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/65cb86860a80ffc6af897d53f5bd4b1733bca0ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7f925fd5226deb953c8dcdc9677d3fcc2717c00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2a97703359e25ec7ef8b2b0ef32fb3982add90a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99097.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99097"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cf4441503e20a0c0a36e0a98dcf57de3d3844c91"},{"fixed":"e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d"},{"fixed":"65cb86860a80ffc6af897d53f5bd4b1733bca0ec"},{"fixed":"c2a97703359e25ec7ef8b2b0ef32fb3982add90a"},{"fixed":"b7f925fd5226deb953c8dcdc9677d3fcc2717c00"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99097.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99097.json"}}],"schema_version":"1.9.2"}