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CVE-2026-99097unknown

tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()

Impact

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Linux · Linux

Other versions: unaffected

Version / rangeSource status
cf4441503e20a0c0a36e0a98dcf57de3d3844c91 to before e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50daffected
cf4441503e20a0c0a36e0a98dcf57de3d3844c91 to before 65cb86860a80ffc6af897d53f5bd4b1733bca0ecaffected
cf4441503e20a0c0a36e0a98dcf57de3d3844c91 to before c2a97703359e25ec7ef8b2b0ef32fb3982add90aaffected
cf4441503e20a0c0a36e0a98dcf57de3d3844c91 to before b7f925fd5226deb953c8dcdc9677d3fcc2717c00affected
Linux version evidence

Linux · Linux

Other versions: affected

Version / rangeSource status
6.10affected
0 to before 6.10unaffected
6.12.113 through 6.12.* (inclusive)unaffected
6.18.57 through 6.18.* (inclusive)unaffected
7.2.11 through 7.2.* (inclusive)unaffected
7.3 through * (inclusive)unaffected
Linux version evidence

Original source description

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.

References