CVE-2026-53329 (GCVE-0-2026-53329)
Vulnerability from cvelistv5
Published
2026-07-01 13:32
Modified
2026-08-05 12:35
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Use krealloc_array() in dal_vector_reserve() [Why & How] dal_vector_reserve() computes the allocation size as "capacity * vector->struct_size" using uint32_t arithmetic, which can silently wrap to a small value on overflow. This would cause krealloc to return a smaller buffer than expected, leading to heap overflows on subsequent vector appends. Replace krealloc() with krealloc_array() which performs an internal overflow check and returns NULL on wrap, preventing the issue. (cherry picked from commit 37668568641ccc4cc1dbca4923d0a16609dd5707)
References
Impacted products
Vendor Product Version
Linux Linux Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
Version: 2004f45ef83f07f43f5da6ede780b08068c7583d
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/basics/vector.c"
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          "vendor": "Linux",
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              "version": "4.15"
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              "version": "0",
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            {
              "lessThanOrEqual": "6.1.*",
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              "version": "6.1.176",
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
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              "status": "unaffected",
              "version": "7.0.13",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.260",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.210",
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                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Use krealloc_array() in dal_vector_reserve()\n\n[Why \u0026 How]\ndal_vector_reserve() computes the allocation size as\n\"capacity * vector-\u003estruct_size\" using uint32_t arithmetic, which can\nsilently wrap to a small value on overflow. This would cause krealloc to\nreturn a smaller buffer than expected, leading to heap overflows on\nsubsequent vector appends.\n\nReplace krealloc() with krealloc_array() which performs an internal\noverflow check and returns NULL on wrap, preventing the issue.\n\n(cherry picked from commit 37668568641ccc4cc1dbca4923d0a16609dd5707)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The reachable kernel path is AMDGPU DRM display handling via local DRM connector probing or modeset operations; it is not network or namespace reachable. Physical hotplug can also reach related detection paths, but local DRM access is the higher-severity reasonable vector.\nAC:H - The overflow is deterministic once vector capacity crosses the uint32 multiplication limit, but the reachable DDC callers I found pass fixed tiny payload lengths and an attacker would need an unusual path causing enormous vector growth. That prerequisite is outside normal attacker control.\nPR:L - Triggering the relevant DRM display paths requires local access to the KMS device or DRM master-style display control, not real root in the init namespace. No user-namespace route or network-facing unauthenticated path reaches this code.\nUI:N - A local attacker who has the needed DRM access can trigger connector probing or modeset paths directly. No separate victim action is required.\nS:U - The corruption occurs inside the host kernel display driver and affects the same kernel security authority. There is no VM escape, IOMMU boundary bypass, or cross-scope component involved.\nC:H - The vulnerable allocation can leave the vector with a logical capacity larger than its actual heap buffer, and subsequent appends can corrupt adjacent kernel heap memory. Kernel heap corruption is reasonably leverageable for information disclosure.\nI:H - Subsequent vector appends perform out-of-bounds writes of controlled `struct i2c_payload` contents into adjacent kernel heap memory. That is kernel memory corruption and can plausibly support control-flow or data-integrity compromise.\nA:H - Even without full exploitation, the undersized allocation followed by appends can corrupt heap metadata or neighboring objects. That can cause kernel oops, panic, or display-driver crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:35:01.324Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9540b0a4d13e4ede64ae1197d66a176d2149daa9"
        },
        {
          "url": "https://git.kernel.org/stable/c/31180638a33acad12c863132704a76536fb66211"
        },
        {
          "url": "https://git.kernel.org/stable/c/b15825deac1acff72638bbc8f05b89ceef8dfb13"
        },
        {
          "url": "https://git.kernel.org/stable/c/201151e120f0062bcda21cad5d007b82725ad23b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a914aa802669e073f014dae2e5708633b5cecd34"
        },
        {
          "url": "https://git.kernel.org/stable/c/e09689286385a66311ac6922af95339d7a3cef8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/de988c7a31f0774f07894cfe4802996f318e2870"
        },
        {
          "url": "https://git.kernel.org/stable/c/da48bc4461b8a5ebfb9264c9b191a701d8e99009"
        }
      ],
      "title": "drm/amd/display: Use krealloc_array() in dal_vector_reserve()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53329",
    "datePublished": "2026-07-01T13:32:14.598Z",
    "dateReserved": "2026-06-09T07:44:35.398Z",
    "dateUpdated": "2026-08-05T12:35:01.324Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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