Medium 5.5Published Oct 1, 2025

CVE-2025-39910mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()

Updated under an hour ago (Oct 28, 2026, 5:40 AM ET)

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Exploited in the last 30 days

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/686ea951.050a0220.385921.0016.GAE@google.com 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.

CVSS: 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-667
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	451769ebb7e792c3404db53b3c2a422990de654e builds before 9598c83a50a5f9d57fd0c12fc08d9425c1ce9537; from 451769ebb7e792c3404db53b3c2a422990de654e before aa1b4b7a1b92743297f9da741424df4703a8e11b; 451769ebb7e792c3404db53b3c2a422990de654e builds before 33b95d90427cb4babf32059e323a6d0c027610fe; 451769ebb7e792c3404db53b3c2a422990de654e builds before 79357cd06d41d0f5a11b17d7c86176e395d10ef2	CNA record
linux linux_kernel linux:linux_kernel	from 5.17 before 6.16.8; 6.17; 6.17; 6.17; 6.17; 6.17	NVD

References

References

https://git.kernel.org/stable/c/9598c83a50a5f9d57fd0c12fc08d9425c1ce9537
https://git.kernel.org/stable/c/aa1b4b7a1b92743297f9da741424df4703a8e11b
https://git.kernel.org/stable/c/33b95d90427cb4babf32059e323a6d0c027610fe	patch
https://git.kernel.org/stable/c/79357cd06d41d0f5a11b17d7c86176e395d10ef2	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.