{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "02205a6752f223779a1b0e9e8ffacbea6e717851"
            },
            {
              "fixed": "0c584c27f6649a93ec12061cc779a4bd8f7c1434"
            },
            {
              "fixed": "88b901fdc1662b131ff908cbd017333b61e7acc8"
            },
            {
              "fixed": "baa333b2700a7fa3529d504529c8c10060fd687c"
            },
            {
              "fixed": "cf334620036ad2250e008c7e7bb6646a3938b7b0"
            },
            {
              "fixed": "f07883450eb14d1cf020b55d9f3a7ec5683bcd26"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.17.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74391.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Bound synthetic-field strings with seq_buf\n\nThe synthetic field helpers build a prefixed synthetic variable name and\na generated hist command in fixed MAX_FILTER_STR_VAL buffers. The\ncurrent code appends those strings with raw strcat(), so long key lists,\nfield names, or saved filters can run past the end of the staging\nbuffers.\n\nBuild both strings with seq_buf and propagate -E2BIG if either the\nsynthetic variable name or the generated command exceeds\nMAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while\nusing the helper intended for bounded command construction.\n\n[ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]",
  "id": "CVE-2026-74391",
  "modified": "2026-08-18T03:31:13.789037596Z",
  "published": "2026-08-15T05:59:05.127Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74391.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74391"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "tracing: Bound synthetic-field strings with seq_buf"
}