CVE-2025-39910
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc() kasan_populate_vmalloc() and its helpers ignore the caller's gfp_mask and always allocate memory using the hardcoded GFP_KERNEL flag. This makes them inconsistent with vmalloc(), which was recently extended to support GFP_NOFS and GFP_NOIO allocations. Page table allocations performed during shadow population also ignore the external gfp_mask. To preserve the intended semantics of GFP_NOFS and GFP_NOIO, wrap the apply_to_page_range() calls into the appropriate memalloc scope. xfs calls vmalloc with GFP_NOFS, so this bug could lead to deadlock. There was a report here https://lkml.kernel.org/r/[email protected] This patch: - Extends kasan_populate_vmalloc() and helpers to take gfp_mask; - Passes gfp_mask down to alloc_pages_bulk() and __get_free_page(); - Enforces GFP_NOFS/NOIO semantics with memalloc_*_save()/restore() around apply_to_page_range(); - Updates vmalloc.c and percpu allocator call sites accordingly.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-10-01 08:15:33.993000
Last modified
2026-10-30 13:18:11.187000
View original CVE JSON
{
"id": "CVE-2025-39910",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-01T08:15:33.993",
"lastModified": "2026-10-30T13:18:11.187",
"vulnStatus": "Modified",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()\n\nkasan_populate_vmalloc() and its helpers ignore the caller's gfp_mask and\nalways allocate memory using the hardcoded GFP_KERNEL flag. This makes\nthem inconsistent with vmalloc(), which was recently extended to support\nGFP_NOFS and GFP_NOIO allocations.\n\nPage table allocations performed during shadow population also ignore the\nexternal gfp_mask. To preserve the intended semantics of GFP_NOFS and\nGFP_NOIO, wrap the apply_to_page_range() calls into the appropriate\nmemalloc scope.\n\nxfs calls vmalloc with GFP_NOFS, so this bug could lead to deadlock.\n\nThere was a report here\nhttps://lkml.kernel.org/r/[email protected]\n\nThis patch:\n - Extends kasan_populate_vmalloc() and helpers to take gfp_mask;\n - Passes gfp_mask down to alloc_pages_bulk() and __get_free_page();\n - Enforces GFP_NOFS/NOIO semantics with memalloc_*_save()/restore()\n around apply_to_page_range();\n - Updates vmalloc.c and percpu allocator call sites accordingly."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/vmalloc, mm/kasan: respetar la máscara gfp en kasan_populate_vmalloc()\n\nkasan_populate_vmalloc() y sus funciones auxiliares ignoran la gfp_mask del llamador y siempre asignan memoria utilizando la bandera GFP_KERNEL codificada. Esto los hace inconsistentes con vmalloc(), que fue extendida recientemente para soportar asignaciones GFP_NOFS y GFP_NOIO.\n\nLas asignaciones de tablas de páginas realizadas durante la población de sombra también ignoran la gfp_mask externa. Para preservar la semántica prevista de GFP_NOFS y GFP_NOIO, envuelva las llamadas a apply_to_page_range() dentro del ámbito memalloc apropiado.\n\nxfs llama a vmalloc con GFP_NOFS, por lo que este error podría llevar a un interbloqueo.\n\nHubo un informe aquí https://lkml.kernel.org/r/[email protected]\n\nEste parche:\n - Extiende kasan_populate_vmalloc() y sus funciones auxiliares para que acepten gfp_mask;\n - Pasa gfp_mask a alloc_pages_bulk() y __get_free_page();\n - Aplica la semántica de GFP_NOFS/NOIO con memalloc_*_save()/restore() alrededor de apply_to_page_range();\n - Actualiza los sitios de llamada del asignador vmalloc.c y percpu en consecuencia."
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