{"id":"CVE-2026-99097","state":"PUBLISHED","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.","publishedAt":"2026-10-26T14:52:03.824Z","updatedAt":"2026-10-26T14:52:03.824Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/tee_shm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/tee_shm.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99097.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99097","state":"PUBLISHED","datePublished":"2026-10-26T14:52:03.824Z","dateUpdated":"2026-10-26T14:52:03.824Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.390Z"},"containers":{"cna":{"title":"tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/tee_shm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/tee_shm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d"},{"url":"https://git.kernel.org/stable/c/65cb86860a80ffc6af897d53f5bd4b1733bca0ec"},{"url":"https://git.kernel.org/stable/c/c2a97703359e25ec7ef8b2b0ef32fb3982add90a"},{"url":"https://git.kernel.org/stable/c/b7f925fd5226deb953c8dcdc9677d3fcc2717c00"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-26T14:52:03.824Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}