Answer in brief
CVE-2025-39836 records a Unknown severity vulnerability in efi: stmm: Fix incorrect buffer allocation method. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 6.8 | Not reported |
| Linux/Linuxgeneric | >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <77ff27ff0e4529a003c8a1c2492c111968c378d3 || >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <630c0e6064daf84f17aad1a7d9ca76b562e3fe47 || >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <c5e81e672699e0c5557b2b755cc8f7a69aa92bff | 77ff27ff0e4529a003c8a1c2492c111968c378d3, 630c0e6064daf84f17aad1a7d9ca76b562e3fe47, c5e81e672699e0c5557b2b755cc8f7a69aa92bff |
Published upstream
Sep 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-39836 records a Unknown severity vulnerability in efi: stmm: Fix incorrect buffer allocation method. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 6.8 | Not reported |
| Linux/Linuxgeneric | >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <77ff27ff0e4529a003c8a1c2492c111968c378d3 || >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <630c0e6064daf84f17aad1a7d9ca76b562e3fe47 || >=c44b6be62e8dd4ee0a308c36a70620613e6fc55f <c5e81e672699e0c5557b2b755cc8f7a69aa92bff | 77ff27ff0e4529a003c8a1c2492c111968c378d3, 630c0e6064daf84f17aad1a7d9ca76b562e3fe47, c5e81e672699e0c5557b2b755cc8f7a69aa92bff |
Published upstream
Sep 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.