CVE-2022-50756 (GCVE-0-2022-50756)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2025-12-24 13:05
VLAI?
Title
nvme-pci: fix mempool alloc size
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix mempool alloc size Convert the max size to bytes to match the units of the divisor that calculates the worst-case number of PRP entries. The result is used to determine how many PRP Lists are required. The code was previously rounding this to 1 list, but we can require 2 in the worst case. In that scenario, the driver would corrupt memory beyond the size provided by the mempool. While unlikely to occur (you'd need a 4MB in exactly 127 phys segments on a queue that doesn't support SGLs), this memory corruption has been observed by kfence.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < dfb6d54893d544151e7f480bc44cfe7823f5ad23 (git)
Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < 9141144b37f30e3e7fa024bcfa0a13011e546ba9 (git)
Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < e1777b4286e526c58b4ee699344b0ad85aaf83a0 (git)
Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < b1814724e0d7162bdf4799f2d565381bc2251c63 (git)
Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < c89a529e823d51dd23c7ec0c047c7a454a428541 (git)
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    Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.87 , ≤ 5.15.* (semver)
Unaffected: 6.0.17 , ≤ 6.0.* (semver)
Unaffected: 6.1.3 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
          ],
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          "vendor": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.17",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
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                },
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                },
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                },
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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\nnvme-pci: fix mempool alloc size\n\nConvert the max size to bytes to match the units of the divisor that\ncalculates the worst-case number of PRP entries.\n\nThe result is used to determine how many PRP Lists are required. The\ncode was previously rounding this to 1 list, but we can require 2 in the\nworst case. In that scenario, the driver would corrupt memory beyond the\nsize provided by the mempool.\n\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\non a queue that doesn\u0027t support SGLs), this memory corruption has been\nobserved by kfence."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:05:49.635Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23"
        },
        {
          "url": "https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541"
        }
      ],
      "title": "nvme-pci: fix mempool alloc size",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50756",
    "datePublished": "2025-12-24T13:05:49.635Z",
    "dateReserved": "2025-12-24T13:02:21.545Z",
    "dateUpdated": "2025-12-24T13:05:49.635Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50756\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:02.353\",\"lastModified\":\"2025-12-24T13:16:02.353\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvme-pci: fix mempool alloc size\\n\\nConvert the max size to bytes to match the units of the divisor that\\ncalculates the worst-case number of PRP entries.\\n\\nThe result is used to determine how many PRP Lists are required. The\\ncode was previously rounding this to 1 list, but we can require 2 in the\\nworst case. In that scenario, the driver would corrupt memory beyond the\\nsize provided by the mempool.\\n\\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\\non a queue that doesn\u0027t support SGLs), this memory corruption has been\\nobserved by kfence.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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