Linux Kernel TEE Zero-Size SHM Allocation Flaw
CVE-2026-99097 Published on October 26, 2026
tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()
In the Linux kernel, the following vulnerability has been resolved:
tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()
tee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size
and passes it to alloc_pages_exact() without checking it. For size == 0
nr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is
documented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page
allocator then trips its order > MAX_PAGE_ORDER warning and fails the
allocation; on a panic_on_warn kernel that ends the boot.
This can be triggered by TEE_IOC_SHM_ALLOC with struct
tee_ioctl_shm_alloc_data where size is 0.
Reject a zero page count, as register_shm_helper() already does for the
register path.
Products Associated with CVE-2026-99097
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Affected Versions
Linux:- Version cf4441503e20a0c0a36e0a98dcf57de3d3844c91 and below e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d is affected.
- Version cf4441503e20a0c0a36e0a98dcf57de3d3844c91 and below 65cb86860a80ffc6af897d53f5bd4b1733bca0ec is affected.
- Version cf4441503e20a0c0a36e0a98dcf57de3d3844c91 and below c2a97703359e25ec7ef8b2b0ef32fb3982add90a is affected.
- Version cf4441503e20a0c0a36e0a98dcf57de3d3844c91 and below b7f925fd5226deb953c8dcdc9677d3fcc2717c00 is affected.
- Version 6.10 is affected.
- Before 6.10 is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.