CVE-2022-49436 (GCVE-0-2022-49436)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2025-05-04 08:37
VLAI?
Title
powerpc/papr_scm: Fix leaking nvdimm_events_map elements
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/papr_scm: Fix leaking nvdimm_events_map elements Right now 'char *' elements allocated for individual 'stat_id' in 'papr_scm_priv.nvdimm_events_map[]' during papr_scm_pmu_check_events(), get leaked in papr_scm_remove() and papr_scm_pmu_register(), papr_scm_pmu_check_events() error paths. Also individual 'stat_id' arent NULL terminated 'char *' instead they are fixed 8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a NULL terminated 'char *' and at other places it assumes it to be a 'papr_scm_perf_stat.stat_id' sized string which is 8-byes in size. Fix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also include space for 'stat_id' entries. This is possible since number of available events/stat_ids are known upfront. This saves some memory and one extra level of indirection from 'nvdimm_events_map' to 'stat_id'. Also rest of the code can continue to call 'kfree(papr_scm_priv.nvdimm_events_map)' without needing to iterate over the array and free up individual elements.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b , < b073096df4dec70d0436321b7093bad27ae91f9e (git)
Affected: 4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b , < 0e0946e22f3665d27325d389ff45ade6e93f3678 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr_scm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b073096df4dec70d0436321b7093bad27ae91f9e",
              "status": "affected",
              "version": "4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b",
              "versionType": "git"
            },
            {
              "lessThan": "0e0946e22f3665d27325d389ff45ade6e93f3678",
              "status": "affected",
              "version": "4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr_scm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.3",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/papr_scm: Fix leaking nvdimm_events_map elements\n\nRight now \u0027char *\u0027 elements allocated for individual \u0027stat_id\u0027 in\n\u0027papr_scm_priv.nvdimm_events_map[]\u0027 during papr_scm_pmu_check_events(), get\nleaked in papr_scm_remove() and papr_scm_pmu_register(),\npapr_scm_pmu_check_events() error paths.\n\nAlso individual \u0027stat_id\u0027 arent NULL terminated \u0027char *\u0027 instead they are fixed\n8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a\nNULL terminated \u0027char *\u0027 and at other places it assumes it to be a\n\u0027papr_scm_perf_stat.stat_id\u0027 sized string which is 8-byes in size.\n\nFix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also\ninclude space for \u0027stat_id\u0027 entries. This is possible since number of available\nevents/stat_ids are known upfront. This saves some memory and one extra level of\nindirection from \u0027nvdimm_events_map\u0027 to \u0027stat_id\u0027. Also rest of the code\ncan continue to call \u0027kfree(papr_scm_priv.nvdimm_events_map)\u0027 without needing to\niterate over the array and free up individual elements."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:37:37.674Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b073096df4dec70d0436321b7093bad27ae91f9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e0946e22f3665d27325d389ff45ade6e93f3678"
        }
      ],
      "title": "powerpc/papr_scm: Fix leaking nvdimm_events_map elements",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49436",
    "datePublished": "2025-02-26T02:12:52.044Z",
    "dateReserved": "2025-02-26T02:08:31.570Z",
    "dateUpdated": "2025-05-04T08:37:37.674Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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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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