{"id":"CVE-2026-99097","revision":"24cbc004b0ce4744bcd5eea5f1f41f44","records":[{"revision":"24cbc004b0ce4744bcd5eea5f1f41f44","observedAt":"2026-10-26T15:35:30.984+00:00","statement":{"source":"cve-program","id":"CVE-2026-99097","aliases":[],"title":"tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()","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.","state":0,"publishedAt":"2026-10-26T14:52:03.824+00:00","modifiedAt":"2026-10-26T14:52:03.824+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/tee/tee_shm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"cf4441503e20a0c0a36e0a98dcf57de3d3844c91\",\n                            \"lessThan\": \"e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf4441503e20a0c0a36e0a98dcf57de3d3844c91\",\n                            \"lessThan\": \"65cb86860a80ffc6af897d53f5bd4b1733bca0ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf4441503e20a0c0a36e0a98dcf57de3d3844c91\",\n                            \"lessThan\": \"c2a97703359e25ec7ef8b2b0ef32fb3982add90a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf4441503e20a0c0a36e0a98dcf57de3d3844c91\",\n                            \"lessThan\": \"b7f925fd5226deb953c8dcdc9677d3fcc2717c00\",\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/tee/tee_shm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.11\",\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/e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d","https://git.kernel.org/stable/c/65cb86860a80ffc6af897d53f5bd4b1733bca0ec","https://git.kernel.org/stable/c/c2a97703359e25ec7ef8b2b0ef32fb3982add90a","https://git.kernel.org/stable/c/b7f925fd5226deb953c8dcdc9677d3fcc2717c00"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99097","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99097","identifiers":["CVE-2026-99097"]},"retained":false,"historicalAffected":[]}],"coverage":[]}