Improper Locking Affecting linux-gcp-6.12 package, versions <6.12.80-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.15% (4th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXGCP612-15992752
  • published12 Apr 2026
  • disclosed1 Oct 2025

Introduced: 1 Oct 2025

CVE-2025-39910  (opens in a new tab)
CWE-667  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-gcp-6.12 to version 6.12.80-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-gcp-6.12 package and not the linux-gcp-6.12 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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 Base Scores

version 3.1