CVE-2026-64243 (GCVE-0-2026-64243)
Vulnerability from cvelistv5
Published
2026-07-24 15:27
Modified
2026-08-05 12:40
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: simple-mux: Fix enum control bounds check simple_mux_control_put() rejects values greater than e->items, but enum control values are zero based. For the two-entry mux used by this driver, valid values are 0 and 1, so value 2 must be rejected as well. Accepting e->items can store an invalid mux state, pass it to the GPIO setter, and pass it on to the DAPM mux update path where it is used as an index into the enum text array. Use the same >= e->items check used by the ASoC enum helpers.
References
Impacted products
Vendor Product Version
Linux Linux Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
Version: 342fbb7578d1741ff646d7b08e14e8753267b9fa
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{
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          "product": "Linux",
          "programFiles": [
            "sound/soc/codecs/simple-mux.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.12.93",
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            },
            {
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              "status": "unaffected",
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              "version": "7.0.12",
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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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\nASoC: codecs: simple-mux: Fix enum control bounds check\n\nsimple_mux_control_put() rejects values greater than e-\u003eitems, but\nenum control values are zero based. For the two-entry mux used by this\ndriver, valid values are 0 and 1, so value 2 must be rejected as well.\n\nAccepting e-\u003eitems can store an invalid mux state, pass it to the GPIO\nsetter, and pass it on to the DAPM mux update path where it is used as\nan index into the enum text array.\n\nUse the same \u003e= e-\u003eitems check used by the ASoC enum helpers."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - An attacker reaches the flaw through SNDRV_CTL_IOCTL_ELEM_WRITE on the local ALSA control device; no network or physical-input path invokes this callback.\nAC:L - Supplying the single invalid enum value 2 directly triggers the vulnerable path on an affected non-hardened build, without a race or conditions outside the attacker\u2019s control.\nPR:L - The ioctl requires ordinary access to /dev/snd/controlC*, commonly granted to the active local user or audio group, and the kernel path performs no capability or namespace checks.\nUI:N - After obtaining control-device access, the attacker can issue the ioctl directly without any action by another user.\nS:U - The vulnerable ALSA driver and the resulting kernel impacts remain within the host kernel\u2019s security authority and do not cross a virtualization or IOMMU boundary.\nC:H - The invalid index performs an out-of-bounds pointer read and then dereferences that pointer through strcmp(); following the required conservative treatment of kernel out-of-bounds reads, confidentiality is scored High.\nI:N - There is no out-of-bounds write or attacker-controlled write primitive; value 2 is stored in-bounds and the GPIO layer normalizes it to the same Boolean state as valid value 1.\nA:H - The out-of-bounds text pointer commonly resolves to NULL or another invalid address and is dereferenced by strcmp(), causing a kernel oops and potentially a full panic on panic-on-oops systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:40:14.935Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6fb653b62f169f6050fac45b56bf21ad097e19f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8cc3e747b002a8b965c529de79c0654675b9a1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fe860af8630cf7c78523cbd68e5a234743585aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ff3ac6f7664fe5639cad01712ac5e021fa7939c"
        },
        {
          "url": "https://git.kernel.org/stable/c/164dcbec9632ca93ae313e6da6e4e05584fa0f02"
        },
        {
          "url": "https://git.kernel.org/stable/c/05ef77f02607a3dc5d7f9762cb990f76843315d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/f63ad68e18d774a5d15cd7e405ead63f6b322679"
        }
      ],
      "title": "ASoC: codecs: simple-mux: Fix enum control bounds check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64243",
    "datePublished": "2026-07-24T15:27:45.311Z",
    "dateReserved": "2026-07-19T15:36:31.772Z",
    "dateUpdated": "2026-08-05T12:40:14.935Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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