CVE-2026-90416 (GCVE-0-2026-90416)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs get_param() reads a congestion parameter as a u32 but formats it with the signed "%d" into an 11-byte stack buffer. A value with bit 31 set, such as 0x80000000, renders as "-2147483648\n" whose full length is 12. snprintf() stores only 11 bytes yet returns 12, so simple_read_from_buffer() treats 12 bytes as valid and reads one byte past lbuf[]. Size the buffer for the widest unsigned decimal, format with "%u" to match the u32, and use scnprintf() so the length passed to simple_read_from_buffer() reflects the bytes actually stored.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
Version: 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/cong.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "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": "4.14",
                  "vulnerable": true
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                  "vulnerable": true
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                  "vulnerable": true
                },
                {
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                {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionEndExcluding": "7.3",
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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\nRDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs\n\nget_param() reads a congestion parameter as a u32 but formats it with the\nsigned \"%d\" into an 11-byte stack buffer. A value with bit 31 set, such as\n0x80000000, renders as \"-2147483648\\n\" whose full length is 12. snprintf()\nstores only 11 bytes yet returns 12, so simple_read_from_buffer() treats 12\nbytes as valid and reads one byte past lbuf[].\n\nSize the buffer for the widest unsigned decimal, format with \"%u\" to match\nthe u32, and use scnprintf() so the length passed to\nsimple_read_from_buffer() reflects the bytes actually stored."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:20.401Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1c5b4f76cd73372c5a8a4c91c95d5a31f141e091"
        },
        {
          "url": "https://git.kernel.org/stable/c/06b62758f81e27ca4c81201c22e3436c6d9ac894"
        },
        {
          "url": "https://git.kernel.org/stable/c/d809cf3f0ed9255abfc73c4730bcf187151422af"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b0122fcc923a0271130f5fb71af2cd7e20434d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce8dfd32a33b578c3abf178f67b4c8d36854f041"
        },
        {
          "url": "https://git.kernel.org/stable/c/4599311e78e88c893ad551aca622de2bfdf1c31f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c75ee076fa09778a2f9602a972dade4a0b0785f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/03826bc1fa6c90405bf05831f2b501a8368dcd27"
        }
      ],
      "title": "RDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90416",
    "datePublished": "2026-09-17T16:09:41.372Z",
    "dateReserved": "2026-09-11T19:38:34.813Z",
    "dateUpdated": "2026-10-19T09:03:20.401Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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