CVE-2026-93280 (GCVE-0-2026-93280)
Vulnerability from cvelistv5
Published
2026-09-24 15:52
Modified
2026-10-19 09:08
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: greybus: audio: bound the topology section sizes against the fetched size gb_audio_gb_get_topology() fetches a topology blob of a module-supplied size, and gbaudio_tplg_parse_data() then walks it by adding the module-supplied size_dais, size_controls and size_widgets fields to form the control, widget and route section offsets. Those le32 sizes are never checked against the fetched blob, so a module reporting a small topology size but large section sizes makes the offsets point past the allocation, and parsing reads out of bounds. Reject a topology whose section sizes do not fit within the fetched size before it is parsed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
Version: 184992e305f1de3a3d5fa446da3a2bc76be7c54a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/greybus/audio_gb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/greybus/audio_gb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngreybus: audio: bound the topology section sizes against the fetched size\n\ngb_audio_gb_get_topology() fetches a topology blob of a module-supplied\nsize, and gbaudio_tplg_parse_data() then walks it by adding the\nmodule-supplied size_dais, size_controls and size_widgets fields to\nform the control, widget and route section offsets. Those le32 sizes\nare never checked against the fetched blob, so a module reporting a\nsmall topology size but large section sizes makes the offsets point\npast the allocation, and parsing reads out of bounds.\n\nReject a topology whose section sizes do not fit within the fetched\nsize before it is parsed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The malformed bytes are size_dais/size_controls/size_widgets in the GB_AUDIO_TYPE_GET_TOPOLOGY response that gb_audio_probe() fetches via gb_audio_gb_get_topology()\u2192gb_operation_sync(); on BeaglePlay that Greybus payload is delivered by hdlc_rx_greybus_frame() from the CC1352 802.15.4 SVC, so a radio-range module supplies the blob, not a routable IP peer.\nAC:L - A module that returns a small GET_TOPOLOGY_SIZE and then oversized le32 size_* fields makes gbaudio_tplg_process_header() compute control_offset/widget_offset past the kzalloc() blob on every gb_audio_probe(); the attacker fully controls those fields and no race or uninfluenced host state is required.\nPR:N - gb_svc_process_module_inserted()\u2192gb_module_add()\u2192gb_interface_enable()\u2192greybus_probe()\u2192gb_audio_probe() runs with no capable() or host-uid check, and CAP authentication is a separate optional ioctl, not a gate on this path; the attacking module needs no Linux account.\nUI:N - gb_audio_probe() itself calls gb_audio_gb_get_topology() and gbaudio_tplg_parse_data() as soon as a GREYBUS_CLASS_AUDIO bundle is registered; no victim ioctl, ALSA open, or mount is required.\nS:U - The over-read and snprintf() stores corrupt the host kernel topology allocation and adjacent slab inside the same kernel authority; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA bypass.\nC:H - gbaudio_tplg_process_kcontrols() and gbaudio_tplg_create_widget() read gb_audio_control/widget fields from the OOB offset, and gb_generate_enum_strings() walks names with an unbounded while (*data != \u0027\\0\u0027) past the blob, disclosing adjacent kernel heap (and those strings can later appear as ALSA enum names).\nI:H - With curr/w pointing past the topology object, snprintf(curr-\u003ename, sizeof(curr-\u003ename), \"GB %d %s\", ...) in gbaudio_tplg_process_kcontrols() and snprintf(w-\u003ename, ...) in gbaudio_tplg_create_widget() perform 32-byte out-of-bounds writes at an attacker-chosen size_dais+size_controls offset, a heap write primitive.\nA:H - Walking those OOB control/widget pointers and the unbounded enum-name scan can fault on an unmapped page during gb_audio_probe() and oops the kernel; the module can re-insert to repeat it."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:08:34.610Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba86de9f7b0d7903d2df5ea2373e34d8ca3fc43e"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd5593aee0a0fb353e1164aff7b65e563fe1f232"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f764363b3173d805be11e59a8f23ecee2d420d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/52daf9de692ebac813d110eb1e677dc0e1f4a5ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0f6eaba60705bacd9bb4ce48eab50ef3f546777"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9191f2e2f35f1209eb2dc24b31129dd47b48c16"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfcc5a41a9664eb68023aae4cd0d485b256bd7c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/33d8c7b794d2a30637c9d3fcb478f1d3222bef1e"
        }
      ],
      "title": "greybus: audio: bound the topology section sizes against the fetched size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93280",
    "datePublished": "2026-09-24T15:52:22.253Z",
    "dateReserved": "2026-09-17T16:02:15.098Z",
    "dateUpdated": "2026-10-19T09:08:34.610Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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