CVE-2026-43256 (GCVE-0-2026-43256)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-08-05 12:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: qcom: camss: vfe: Fix out-of-bounds access in vfe_isr_reg_update() vfe_isr() iterates using MSM_VFE_IMAGE_MASTERS_NUM(7) as the loop bound and passes the index to vfe_isr_reg_update(). However, vfe->line[] array is defined with VFE_LINE_NUM_MAX(4): struct vfe_line line[VFE_LINE_NUM_MAX]; When index is 4, 5, 6, the access to vfe->line[line_id] exceeds the array bounds and resulting in out-of-bounds memory access. Fix this by using separate loops for output lines and write masters.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
Version: 4edc8eae715cecf5f8bf12a0c77c281f336c37db
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          "programFiles": [
            "drivers/media/platform/qcom/camss/camss-vfe-480.c"
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      "cpeApplicability": [
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          "nodes": [
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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\nmedia: qcom: camss: vfe: Fix out-of-bounds access in vfe_isr_reg_update()\n\nvfe_isr() iterates using MSM_VFE_IMAGE_MASTERS_NUM(7) as the loop\nbound and passes the index to vfe_isr_reg_update(). However,\nvfe-\u003eline[] array is defined with VFE_LINE_NUM_MAX(4):\n\n    struct vfe_line line[VFE_LINE_NUM_MAX];\n\nWhen index is 4, 5, 6, the access to vfe-\u003eline[line_id] exceeds\nthe array bounds and resulting in out-of-bounds memory access.\n\nFix this by using separate loops for output lines and write masters."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 path is reached through local V4L2/media device use, where a process starts CAMSS camera streaming and the hardware interrupt enters vfe_isr(). It is not directly network-facing and does not require physical hotplug beyond the affected built-in camera hardware.\nAC:L - On SM8250 VFE-lite, ordinary bus completion bits overlap the erroneous RDI_RUP checks for indices 4-6, so normal streaming interrupts can pass out-of-bounds line IDs. No race or condition outside the attacker\u0027s control is required once streaming is active.\nPR:L - The driver has no capable() or administrator-only check on this path; access is governed by V4L2 device-node or camera-service permissions. This is basic local privilege, not real root in the init namespace.\nUI:N - A malicious local process with access to the camera device can configure buffers and start streaming itself. No separate victim action is required.\nS:U - The impact remains within the kernel/CAMSS security authority. There is no guest-to-host, IOMMU, or other cross-scope boundary bypass.\nC:H - The bug performs out-of-bounds reads from kernel memory beyond vfe-\u003eline[]. Because this is repeatable kernel memory corruption, high confidentiality impact is defensible.\nI:H - If the out-of-bounds wait_reg_update field is nonzero, the ISR writes to out-of-bounds memory and calls complete() on an out-of-bounds completion object. This can corrupt adjacent kernel objects, so integrity impact is high.\nA:H - The out-of-bounds access and possible complete() on invalid memory occur in interrupt context and can cause an oops or panic. The trigger can be repeated by restarting or continuing camera streaming."
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:55.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e6cbf765686fb6c1d8f2530b3daf6c66efc92f5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c074e80921fd18984b75836730d76c768c84f65"
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        {
          "url": "https://git.kernel.org/stable/c/1b103307df6d461a0731be25aca69ad0335b0933"
        },
        {
          "url": "https://git.kernel.org/stable/c/fade67c88870f497a13ed450ba01f7236c92dd9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7a38ecda2498e7ce998793ac2a46ca47317635d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d965919af524e68cb2ab1a685872050ad2ee933d"
        }
      ],
      "title": "media: qcom: camss: vfe: Fix out-of-bounds access in vfe_isr_reg_update()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43256",
    "datePublished": "2026-05-06T11:28:45.209Z",
    "dateReserved": "2026-05-01T14:12:55.996Z",
    "dateUpdated": "2026-08-05T12:26:55.873Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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