# CVE-2026-99097: linux: In the Linux kernel, the following vulnerability has been resolved:  tee: shm: reject zero-sized allocations in tee_d...

CVE-2026-99097 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99097, released October 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99097
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 26, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-99097](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99097.md) | Oct 27, 2026 |
| Linux | linux Debian 14 | 7.2.11-1 | [DEBIAN-CVE-2026-99097](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99097.md) | Oct 27, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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