CVE-2025-39836 - efi: stmm: Fix incorrect buffer allocation method

CVE-2025-39836 - efi: stmm: Fix incorrect buffer allocation method

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/16/2025 - 17:39
CVE ID : CVE-2025-39836
Published : Sept. 16, 2025, 1:08 p.m. | 1 hour, 7 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: efi: stmm: Fix incorrect buffer allocation method The communication buffer allocated by setup_mm_hdr() is later on passed to tee_shm_register_kernel_buf(). The latter expects those buffers to be contiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause various corruptions or BUGs, specifically since commit 9aec2fb0fd5e ("slab: allocate frozen pages"), though it was broken before as well. Fix this by using alloc_pages_exact() instead of kmalloc().
Severity: 0.0 | NA
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