CVE-2025-39910 (GCVE-0-2025-39910)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:44 – Updated: 2026-05-11 21:38
VLAI
Title
mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:42 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 451769ebb7e792c3404db53b3c2a422990de654e , < 33b95d90427cb4babf32059e323a6d0c027610fe (git)
Affected: 451769ebb7e792c3404db53b3c2a422990de654e , < 79357cd06d41d0f5a11b17d7c86176e395d10ef2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                      "vulnerable": true
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                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17",
                      "versionStartIncluding": "5.17",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "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\u0027s 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/686ea951.050a0220.385921.0016.GAE@google.com\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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-10-01T07:44:33.759Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/33b95d90427cb4babf32059e323a6d0c027610fe"
            },
            {
              "url": "https://git.kernel.org/stable/c/79357cd06d41d0f5a11b17d7c86176e395d10ef2"
            }
          ],
          "title": "mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39910",
        "datePublished": "2025-10-01T07:44:33.759Z",
        "dateReserved": "2025-04-16T07:20:57.147Z",
        "dateUpdated": "2026-01-14T17:42:47.091Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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