{"id":"CVE-2026-99097","aliases":[],"title":"tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()","titleSource":"Linux","descriptionSource":"Linux","products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"cf4441503e20a0c0a36e0a98dcf57de3d3844c91","status":"affected","lessThan":"e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d","versionType":"git"},{"version":"cf4441503e20a0c0a36e0a98dcf57de3d3844c91","status":"affected","lessThan":"65cb86860a80ffc6af897d53f5bd4b1733bca0ec","versionType":"git"},{"version":"cf4441503e20a0c0a36e0a98dcf57de3d3844c91","status":"affected","lessThan":"c2a97703359e25ec7ef8b2b0ef32fb3982add90a","versionType":"git"},{"version":"cf4441503e20a0c0a36e0a98dcf57de3d3844c91","status":"affected","lessThan":"b7f925fd5226deb953c8dcdc9677d3fcc2717c00","versionType":"git"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99097"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99097"}],"remediation":[],"description":"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 > 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.","severity":"unknown","score":null,"published":"2026-10-26T14:52:03.824Z","modified":"2026-10-26T14:52:03.824Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://git.kernel.org/stable/c/e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d","https://git.kernel.org/stable/c/65cb86860a80ffc6af897d53f5bd4b1733bca0ec","https://git.kernel.org/stable/c/c2a97703359e25ec7ef8b2b0ef32fb3982add90a","https://git.kernel.org/stable/c/b7f925fd5226deb953c8dcdc9677d3fcc2717c00"],"sources":[{"name":"CVE","id":"CVE-2026-99097","modified":"2026-10-26T14:52:03.824Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99097"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T04:50:31.701Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}