CVE-2026-46268 (GCVE-0-2026-46268)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:50 – Updated: 2026-06-03 15:50
VLAI
Title
PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition Commit b7e282378773 has already changed the initial page refcount of p2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses "VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))" to assert the initial page refcount should not be zero and the following will be reported when CONFIG_DEBUG_VM is enabled: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000 flags: 0x20000000002000(reserved|node=0|zone=4) raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page)) ------------[ cut here ]------------ WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60 Fix by using "page_ref_count(page)" as the assertion condition.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b7e2823787735ca009e63f35f164b46df0ef096c , < eb9aa9f8010465d927864f5a35bdc5604b0ff51a (git)
Affected: b7e2823787735ca009e63f35f164b46df0ef096c , < 9b69243983fb2f4d4d1f4ef0989bc1296547dc2c (git)
Affected: b7e2823787735ca009e63f35f164b46df0ef096c , < cb500023a75246f60b79af9f7321d6e75330c5b5 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/p2pdma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.15"
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              "version": "0",
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            },
            {
              "lessThanOrEqual": "6.19.*",
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              "version": "6.19.4",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.15",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition\n\nCommit b7e282378773 has already changed the initial page refcount of\np2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses\n\"VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\" to assert the initial page\nrefcount should not be zero and the following will be reported when\nCONFIG_DEBUG_VM is enabled:\n\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000\n  flags: 0x20000000002000(reserved|node=0|zone=4)\n  raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000\n  raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n  page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\n  ------------[ cut here ]------------\n  WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60\n\nFix by using \"page_ref_count(page)\" as the assertion condition."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T15:50:10.101Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5"
        }
      ],
      "title": "PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46268",
    "datePublished": "2026-06-03T15:50:10.101Z",
    "dateReserved": "2026-05-13T15:03:33.109Z",
    "dateUpdated": "2026-06-03T15:50:10.101Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46268\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:28.473\",\"lastModified\":\"2026-06-03T18:16:28.473\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition\\n\\nCommit b7e282378773 has already changed the initial page refcount of\\np2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses\\n\\\"VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\\\" to assert the initial page\\nrefcount should not be zero and the following will be reported when\\nCONFIG_DEBUG_VM is enabled:\\n\\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000\\n  flags: 0x20000000002000(reserved|node=0|zone=4)\\n  raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000\\n  raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\\n  page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\\n  ------------[ cut here ]------------\\n  WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60\\n\\nFix by using \\\"page_ref_count(page)\\\" as the assertion condition.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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