FKIE_CVE-2026-74498

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-19 17:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value. Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory. Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size. [ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/endpoint.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "10c24e6fddf4bdff0b6b05a47a4347b38e6960e8",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "b1770f9ac35c0ffc34914d52347c65dcd5ac049b",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "3852974608f53e530e27c21d0c6c7d79c17b3f5a",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "f9b6c9576568169139ac151f7881474f384659fd",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "04595233e5606d452f9f47e6989fc7ae7440fd40",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "bd65b7191683bebd9923904f0558b9211b9129da",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            },
            {
              "lessThan": "d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5",
              "status": "affected",
              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/endpoint.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.5"
            },
            {
              "lessThan": "3.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set\n\nWhen a USB audio endpoint requests full packet transfers via the fill_max\ndescriptor flag, data_ep_set_params() promotes ep-\u003ecurpacksize to\nep-\u003emaxpacksize. However, maxsize is left at the original sample-rate\nderived value.\n\nSince u-\u003ebuffer_size is allocated as maxsize * packets, the resulting\nDMA buffer is far too small for the requested transfer length. When the\nUSB host controller streams up to curpacksize bytes per packet, it writes\npast the end of the buffer via DMA, corrupting kernel heap memory.\n\nUpdate maxsize to curpacksize when fill_max is set so that the allocated\nDMA buffer size matches the actual transfer request size.\n\n[ changed to reassign maxsize only when ep-\u003efill_max is set -- tiwai ]"
    }
  ],
  "id": "CVE-2026-74498",
  "lastModified": "2026-08-19T17:21:07.203",
  "metrics": {},
  "published": "2026-08-15T13:17:54.760",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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