CVE-2025-40199 (GCVE-0-2025-40199)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2025-12-01 06:20
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge reported that the introduction of PP_MAGIC_MASK let to crashes on boot on his 32-bit parisc machine. The cause of this is the mask is set too wide, so the page_pool_page_is_pp() incurs false positives which crashes the machine. Just disabling the check in page_pool_is_pp() will lead to the page_pool code itself malfunctioning; so instead of doing this, this patch changes the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel pointers for page_pool-tagged pages. The fix relies on the kernel pointers that alias with the pp_magic field always being above PAGE_OFFSET. With this assumption, we can use the lowest bit of the value of PAGE_OFFSET as the upper bound of the PP_DMA_INDEX_MASK, which should avoid the false positives. Because we cannot rely on PAGE_OFFSET always being a compile-time constant, nor on it always being >0, we fall back to disabling the dma_index storage when there are not enough bits available. This leaves us in the situation we were in before the patch in the Fixes tag, but only on a subset of architecture configurations. This seems to be the best we can do until the transition to page types in complete for page_pool pages. v2: - Make sure there's at least 8 bits available and that the PAGE_OFFSET bit calculation doesn't wrap
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4f51fb0d257ff4d406ec27966902de075e3b118e , < 15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a (git)
Affected: ee62ce7a1d909ccba0399680a03c2dee83bcae95 , < f62934cea32c8f7b11b747975d69bf5afe4264cf (git)
Affected: ee62ce7a1d909ccba0399680a03c2dee83bcae95 , < 95920c2ed02bde551ab654e9749c2ca7bc3100e0 (git)
Affected: c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4 (git)
Create a notification for this product.
    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/mm.h",
            "net/core/page_pool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a",
              "status": "affected",
              "version": "4f51fb0d257ff4d406ec27966902de075e3b118e",
              "versionType": "git"
            },
            {
              "lessThan": "f62934cea32c8f7b11b747975d69bf5afe4264cf",
              "status": "affected",
              "version": "ee62ce7a1d909ccba0399680a03c2dee83bcae95",
              "versionType": "git"
            },
            {
              "lessThan": "95920c2ed02bde551ab654e9749c2ca7bc3100e0",
              "status": "affected",
              "version": "ee62ce7a1d909ccba0399680a03c2dee83bcae95",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/mm.h",
            "net/core/page_pool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.54",
                  "versionStartIncluding": "6.12.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.4",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.15.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npage_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches\n\nHelge reported that the introduction of PP_MAGIC_MASK let to crashes on\nboot on his 32-bit parisc machine. The cause of this is the mask is set\ntoo wide, so the page_pool_page_is_pp() incurs false positives which\ncrashes the machine.\n\nJust disabling the check in page_pool_is_pp() will lead to the page_pool\ncode itself malfunctioning; so instead of doing this, this patch changes\nthe define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel\npointers for page_pool-tagged pages.\n\nThe fix relies on the kernel pointers that alias with the pp_magic field\nalways being above PAGE_OFFSET. With this assumption, we can use the\nlowest bit of the value of PAGE_OFFSET as the upper bound of the\nPP_DMA_INDEX_MASK, which should avoid the false positives.\n\nBecause we cannot rely on PAGE_OFFSET always being a compile-time\nconstant, nor on it always being \u003e0, we fall back to disabling the\ndma_index storage when there are not enough bits available. This leaves\nus in the situation we were in before the patch in the Fixes tag, but\nonly on a subset of architecture configurations. This seems to be the\nbest we can do until the transition to page types in complete for\npage_pool pages.\n\nv2:\n- Make sure there\u0027s at least 8 bits available and that the PAGE_OFFSET\n  bit calculation doesn\u0027t wrap"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:20:00.939Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f62934cea32c8f7b11b747975d69bf5afe4264cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/95920c2ed02bde551ab654e9749c2ca7bc3100e0"
        }
      ],
      "title": "page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40199",
    "datePublished": "2025-11-12T21:56:33.510Z",
    "dateReserved": "2025-04-16T07:20:57.178Z",
    "dateUpdated": "2025-12-01T06:20:00.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40199\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T22:15:47.043\",\"lastModified\":\"2025-11-14T16:42:30.503\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npage_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches\\n\\nHelge reported that the introduction of PP_MAGIC_MASK let to crashes on\\nboot on his 32-bit parisc machine. The cause of this is the mask is set\\ntoo wide, so the page_pool_page_is_pp() incurs false positives which\\ncrashes the machine.\\n\\nJust disabling the check in page_pool_is_pp() will lead to the page_pool\\ncode itself malfunctioning; so instead of doing this, this patch changes\\nthe define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel\\npointers for page_pool-tagged pages.\\n\\nThe fix relies on the kernel pointers that alias with the pp_magic field\\nalways being above PAGE_OFFSET. With this assumption, we can use the\\nlowest bit of the value of PAGE_OFFSET as the upper bound of the\\nPP_DMA_INDEX_MASK, which should avoid the false positives.\\n\\nBecause we cannot rely on PAGE_OFFSET always being a compile-time\\nconstant, nor on it always being \u003e0, we fall back to disabling the\\ndma_index storage when there are not enough bits available. This leaves\\nus in the situation we were in before the patch in the Fixes tag, but\\nonly on a subset of architecture configurations. This seems to be the\\nbest we can do until the transition to page types in complete for\\npage_pool pages.\\n\\nv2:\\n- Make sure there\u0027s at least 8 bits available and that the PAGE_OFFSET\\n  bit calculation doesn\u0027t wrap\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95920c2ed02bde551ab654e9749c2ca7bc3100e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f62934cea32c8f7b11b747975d69bf5afe4264cf\",\"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 observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.