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CVE-2022-50867 (GCVE-0-2022-50867)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:15 – Updated: 2026-08-05 08:59
VLAI
Title
drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage adreno_show_object() is a trap! It will re-allocate the pointer it is passed on first call, when the data is ascii85 encoded, using kvmalloc/ kvfree(). Which means the data *passed* to it must be kvmalloc'd, ie. we cannot use the state_kcalloc() helper. This partially reverts commit ec8f1813bf8d ("drm/msm/a6xx: Replace kcalloc() with kvzalloc()"), but adds the missing kvfree() to fix the memory leak that was present previously. And adds a warning comment. Patchwork: https://patchwork.freedesktop.org/patch/507014/
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b859f9b009bbfbc236d9b076c64c59ccb41b8737 , < 4b1bbc0571a5d7ee10f754186dc3d619b9ced5c1 (git)
Affected: b859f9b009bbfbc236d9b076c64c59ccb41b8737 , < 83d18e9d9c0150d98dc24e3642ea93f5e245322c (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.0.7 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c",
            "drivers/gpu/drm/msm/adreno/adreno_gpu.c"
          ],
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          "vendor": "Linux",
          "versions": [
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                {
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage\n\nadreno_show_object() is a trap!  It will re-allocate the pointer it is\npassed on first call, when the data is ascii85 encoded, using kvmalloc/\nkvfree().  Which means the data *passed* to it must be kvmalloc\u0027d, ie.\nwe cannot use the state_kcalloc() helper.\n\nThis partially reverts commit ec8f1813bf8d (\"drm/msm/a6xx: Replace\nkcalloc() with kvzalloc()\"), but adds the missing kvfree() to fix the\nmemory leak that was present previously.  And adds a warning comment.\n\nPatchwork: https://patchwork.freedesktop.org/patch/507014/"
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable show/encode path is reached after a local GPU hang or iova fault captures crash state via msm_gpu_crashstate_capture(); an unprivileged process triggers that through DRM render-node submits (MSM_GEM_SUBMIT). There is no network or adjacent-packet path into a6xx_show/adreno_show_object.\nAC:L - An attacker fully controls both sides: submit work that hangs or faults the a6xx GPU, then rely on the deterministic ascii85 reallocation in adreno_show_object() when the dump is read. No race or attacker-uncontrollable memory-layout precondition is required.\nPR:L - Unprivileged users can open /dev/dri/renderD* and hang the GPU. On the primary msm deployments (ChromeOS/Android), crash_reporter/udev_collector automatically reads /sys/class/devcoredump/devcdN/data for the adreno driver, invoking the bad kvfree without the attacker needing root. Choosing the higher-severity PR:L over PR:H for that reasonable scenario.\nUI:N - The attacker submits the hanging GPU work themselves, and automatic device-coredump collection invokes a6xx_show without any separate victim mount/open/interactive action.\nS:U - The invalid free corrupts host kernel allocator state within the same OS security authority; this is a local privilege-escalation class bug, not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - adreno_show_object() kvfree()s an interior pointer into a state_kcalloc() memobj (past list_head), corrupting kvmalloc/SLUB freelist metadata; that heap corruption can be leveraged for arbitrary kernel memory disclosure, matching kernel CVSS guidance for memory-corruption bugs.\nI:H - The same interior-pointer free (and subsequent double-free of the memobj on a6xx_gpu_state_destroy) corrupts heap freelists and adjacent objects, enabling reuse and write/control-flow hijacking primitives rather than a benign bounded fault.\nA:H - The gitlab issue closed by the fix reports that reading the devcoredump triggers memory corruption; invalid free/double-free produce kernel oops/panic, which is Availability High under kernel CVSS guidance."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:53.122Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/4b1bbc0571a5d7ee10f754186dc3d619b9ced5c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/83d18e9d9c0150d98dc24e3642ea93f5e245322c"
        }
      ],
      "title": "drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50867",
    "datePublished": "2025-12-30T12:15:38.520Z",
    "dateReserved": "2025-12-30T12:06:07.136Z",
    "dateUpdated": "2026-08-05T08:59:53.122Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-17",
      "epss": "0.0014",
      "percentile": "0.03761"
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                ],
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage\n\nadreno_show_object() is a trap!  It will re-allocate the pointer it is\npassed on first call, when the data is ascii85 encoded, using kvmalloc/\nkvfree().  Which means the data *passed* to it must be kvmalloc\u0027d, ie.\nwe cannot use the state_kcalloc() helper.\n\nThis partially reverts commit ec8f1813bf8d (\"drm/msm/a6xx: Replace\nkcalloc() with kvzalloc()\"), but adds the missing kvfree() to fix the\nmemory leak that was present previously.  And adds a warning comment.\n\nPatchwork: https://patchwork.freedesktop.org/patch/507014/"
          }
        ],
        "id": "CVE-2022-50867",
        "lastModified": "2026-08-04T10:18:24.920",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2025-12-30T13:16:01.533",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4b1bbc0571a5d7ee10f754186dc3d619b9ced5c1"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/83d18e9d9c0150d98dc24e3642ea93f5e245322c"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-21T12:07:29+00:00",
      "cve": "CVE-2022-50867",
      "id": "CVE-2022-50867",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Memory leak in drm/msm/a6xx graphics driver",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50867.json",
      "version": "3"
    }
  }
}



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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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  • 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.
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  • 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.


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