CVE-2026-93808 (GCVE-0-2026-93808)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-03 10:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: caiaq: validate EP1 reply lengths usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes. Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.
References
Impacted products
Vendor Product Version
Linux Linux Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/caiaq/device.c",
            "sound/usb/caiaq/input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "91acd231f219452fa58285239f83945accad9513",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "7cc6b3745a0cea697c8d0684b3094f220281a08d",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "add9328c91c195c494cd68a21b19e5e47a20d784",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "319393151367e6626affedcdd4f7b7b0286f4246",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "af8a172c4f71ac30d625f2966d2389a7fa872819",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "74f3c639f64fa5da4e1613149798b5089bce2807",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            },
            {
              "lessThan": "aba30af07d4fe499b50209801eba9da8a815522f",
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/caiaq/device.c",
            "sound/usb/caiaq/input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb-\u003eactual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:57:41.411Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d"
        },
        {
          "url": "https://git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784"
        },
        {
          "url": "https://git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246"
        },
        {
          "url": "https://git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819"
        },
        {
          "url": "https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807"
        },
        {
          "url": "https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f"
        }
      ],
      "title": "ALSA: usb-audio: caiaq: validate EP1 reply lengths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93808",
    "datePublished": "2026-09-24T16:02:43.621Z",
    "dateReserved": "2026-09-18T17:59:28.790Z",
    "dateUpdated": "2026-10-03T10:57:41.411Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.