FKIE_CVE-2026-93122

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-10-30 13:20
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: usb: gadget: uac: validate rate list length before storing UAC1 and UAC2 configfs rate-list attributes parse a comma-separated list of sampling rates and store each parsed value in fixed-size arrays. The arrays have UAC_MAX_RATES entries, but the store paths do not check that the input contains at most that many tokens before writing through opts->name##s[i++]. Writing more than ten rates therefore writes past the end of the p_srates[] or c_srates[] array in struct f_uac1_opts or struct f_uac2_opts. With CONFIG_UBSAN_BOUNDS enabled, writing an 11-entry rate list to the UAC1 p_srate attribute reports: UBSAN: array-index-out-of-bounds drivers/usb/gadget/function/f_uac1.c:1669:1 index 10 is out of range for type 'int [10]' __ubsan_handle_out_of_bounds.cold f_uac1_opts_p_srate_store configfs_write_iter vfs_write ksys_write do_syscall_64 The same reproducer against the UAC2 p_srate attribute reports: UBSAN: array-index-out-of-bounds drivers/usb/gadget/function/f_uac2.c:2087:1 index 10 is out of range for type 'int [10]' __ubsan_handle_out_of_bounds.cold f_uac2_opts_p_srate_store configfs_write_iter vfs_write ksys_write do_syscall_64 Reject additional tokens once UAC_MAX_RATES entries have been parsed. Also keep the original kstrdup() pointer for kfree(), because strsep() advances the parsing cursor. Freeing the advanced cursor leaks the original buffer on successful parses and can free an interior pointer on some error paths.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0203146ad450932c2d3132e367a99c49efe3122d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c2710a36b41bf8defba83c395b99eb1660e9e9a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/30b3b3494000aa01fc8f08bf07ed503c9fde4895
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3819c6f255a37c4d085ce9f264f9f11bf3c2c6bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72888d54bae3677ecd4ba9793b7fd27ba0b27862
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/844d83d5964b87919b958ff48405188c6ddae9cc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_uac1.c",
            "drivers/usb/gadget/function/f_uac2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "30b3b3494000aa01fc8f08bf07ed503c9fde4895",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            },
            {
              "lessThan": "72888d54bae3677ecd4ba9793b7fd27ba0b27862",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            },
            {
              "lessThan": "0c2710a36b41bf8defba83c395b99eb1660e9e9a",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            },
            {
              "lessThan": "0203146ad450932c2d3132e367a99c49efe3122d",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            },
            {
              "lessThan": "3819c6f255a37c4d085ce9f264f9f11bf3c2c6bb",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            },
            {
              "lessThan": "844d83d5964b87919b958ff48405188c6ddae9cc",
              "status": "affected",
              "version": "a7339e4f5788bd088bb0be1f96a6cce459676ed0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_uac1.c",
            "drivers/usb/gadget/function/f_uac2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\nusb: gadget: uac: validate rate list length before storing\n\nUAC1 and UAC2 configfs rate-list attributes parse a comma-separated\nlist of sampling rates and store each parsed value in fixed-size arrays.\nThe arrays have UAC_MAX_RATES entries, but the store paths do not check\nthat the input contains at most that many tokens before writing through\nopts-\u003ename##s[i++].\n\nWriting more than ten rates therefore writes past the end of the\np_srates[] or c_srates[] array in struct f_uac1_opts or struct\nf_uac2_opts.\n\nWith CONFIG_UBSAN_BOUNDS enabled, writing an 11-entry rate list to the\nUAC1 p_srate attribute reports:\n\n  UBSAN: array-index-out-of-bounds\n  drivers/usb/gadget/function/f_uac1.c:1669:1\n  index 10 is out of range for type \u0027int [10]\u0027\n  __ubsan_handle_out_of_bounds.cold\n  f_uac1_opts_p_srate_store\n  configfs_write_iter\n  vfs_write\n  ksys_write\n  do_syscall_64\n\nThe same reproducer against the UAC2 p_srate attribute reports:\n\n  UBSAN: array-index-out-of-bounds\n  drivers/usb/gadget/function/f_uac2.c:2087:1\n  index 10 is out of range for type \u0027int [10]\u0027\n  __ubsan_handle_out_of_bounds.cold\n  f_uac2_opts_p_srate_store\n  configfs_write_iter\n  vfs_write\n  ksys_write\n  do_syscall_64\n\nReject additional tokens once UAC_MAX_RATES entries have been parsed.\nAlso keep the original kstrdup() pointer for kfree(), because strsep()\nadvances the parsing cursor. Freeing the advanced cursor leaks the\noriginal buffer on successful parses and can free an interior pointer on\nsome error paths."
    }
  ],
  "id": "CVE-2026-93122",
  "lastModified": "2026-10-30T13:20:57.807",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:18:06.917",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0203146ad450932c2d3132e367a99c49efe3122d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c2710a36b41bf8defba83c395b99eb1660e9e9a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/30b3b3494000aa01fc8f08bf07ed503c9fde4895"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3819c6f255a37c4d085ce9f264f9f11bf3c2c6bb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/72888d54bae3677ecd4ba9793b7fd27ba0b27862"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/844d83d5964b87919b958ff48405188c6ddae9cc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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