CVE-2025-39910 (GCVE-0-2025-39910)
Vulnerability from cvelistv5
Published
2025-10-01 07:44
Modified
2025-10-01 07:44
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 451769ebb7e792c3404db53b3c2a422990de654e
Version: 451769ebb7e792c3404db53b3c2a422990de654e
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/kasan.h",
            "mm/kasan/shadow.c",
            "mm/vmalloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "33b95d90427cb4babf32059e323a6d0c027610fe",
              "status": "affected",
              "version": "451769ebb7e792c3404db53b3c2a422990de654e",
              "versionType": "git"
            },
            {
              "lessThan": "79357cd06d41d0f5a11b17d7c86176e395d10ef2",
              "status": "affected",
              "version": "451769ebb7e792c3404db53b3c2a422990de654e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/kasan.h",
            "mm/kasan/shadow.c",
            "mm/vmalloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.8",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "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": "2025-10-01T07:44:33.759Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39910\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T08:15:33.993\",\"lastModified\":\"2025-10-02T19:12:17.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/33b95d90427cb4babf32059e323a6d0c027610fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79357cd06d41d0f5a11b17d7c86176e395d10ef2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.