{"id":"CVE-2026-74391","summary":"tracing: Bound synthetic-field strings with seq_buf","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 ]","modified":"2026-08-18T03:31:13.789037596Z","published":"2026-08-15T05:59:05.127Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74391.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"02205a6752f223779a1b0e9e8ffacbea6e717851"},{"fixed":"0c584c27f6649a93ec12061cc779a4bd8f7c1434"},{"fixed":"88b901fdc1662b131ff908cbd017333b61e7acc8"},{"fixed":"baa333b2700a7fa3529d504529c8c10060fd687c"},{"fixed":"cf334620036ad2250e008c7e7bb6646a3938b7b0"},{"fixed":"f07883450eb14d1cf020b55d9f3a7ec5683bcd26"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74391.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74391.json"}}],"schema_version":"1.9.0"}