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CVE-2026-99097— tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： tee: shm: 在 tee_dyn_shm_alloc_helper() 中拒绝零大小的内存分配请求 tee_dyn_shm_alloc_helper() 函数根据调用者提供的大小参数计算 nr_pages，并在未进行校验的情况下将其传递给 alloc_pages_exact()。当 size 为 0 时，nr_pages 也为 0，此时 alloc_pages_exact(0) 会调用 get_order(0)。根据文档，get_order(0) 的行为是未定义的

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-99097

Vulnerability Information
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Vulnerability Title
tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux cf4441503e20a0c0a36e0a98dcf57de3d3844c91 ~ e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-99097

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-99097

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Patches & Fixes for CVE-2026-99097 (4)

Same Patch Batch · Linux · 2026-10-26 · 12 CVEs total

CVE-2026-99099 x86/CPU/AMD: Fix AMD TLBI Erratum #1718
CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size
CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind
CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions
CVE-2026-99094 Bluetooth: btintel_pcie: fix TX descriptor bounds check
CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting
CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses
CVE-2026-99090 drm/amdgpu: serialize vblank counter reads against GPU reset
CVE-2026-99091 Bluetooth: MGMT: Fix status of pending commands flushed on power off
CVE-2026-99089 ASoC: samsung: i2s: enable op_clk in probe to balance runtime PM
CVE-2026-99088 net: openvswitch: validate transport header presence in set_ipv6_addr

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux