{"api_version":"1","generated_at":"2026-08-15T08:45:14+00:00","cve":"CVE-2026-74391","urls":{"html":"https://cve.report/CVE-2026-74391","api":"https://cve.report/api/cve/CVE-2026-74391.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74391","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74391"},"summary":{"title":"tracing: Bound synthetic-field strings with seq_buf","description":"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 ]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:41","updated_at":"2026-08-15 06:22:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0","name":"https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26","name":"https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c","name":"https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8","name":"https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434","name":"https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74391","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74391","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 02205a6752f223779a1b0e9e8ffacbea6e717851 0c584c27f6649a93ec12061cc779a4bd8f7c1434 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 02205a6752f223779a1b0e9e8ffacbea6e717851 88b901fdc1662b131ff908cbd017333b61e7acc8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 02205a6752f223779a1b0e9e8ffacbea6e717851 baa333b2700a7fa3529d504529c8c10060fd687c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 02205a6752f223779a1b0e9e8ffacbea6e717851 cf334620036ad2250e008c7e7bb6646a3938b7b0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 02205a6752f223779a1b0e9e8ffacbea6e717851 f07883450eb14d1cf020b55d9f3a7ec5683bcd26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/trace/trace_events_hist.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0c584c27f6649a93ec12061cc779a4bd8f7c1434","status":"affected","version":"02205a6752f223779a1b0e9e8ffacbea6e717851","versionType":"git"},{"lessThan":"88b901fdc1662b131ff908cbd017333b61e7acc8","status":"affected","version":"02205a6752f223779a1b0e9e8ffacbea6e717851","versionType":"git"},{"lessThan":"baa333b2700a7fa3529d504529c8c10060fd687c","status":"affected","version":"02205a6752f223779a1b0e9e8ffacbea6e717851","versionType":"git"},{"lessThan":"cf334620036ad2250e008c7e7bb6646a3938b7b0","status":"affected","version":"02205a6752f223779a1b0e9e8ffacbea6e717851","versionType":"git"},{"lessThan":"f07883450eb14d1cf020b55d9f3a7ec5683bcd26","status":"affected","version":"02205a6752f223779a1b0e9e8ffacbea6e717851","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/trace/trace_events_hist.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.17"},{"lessThan":"4.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"4.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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 ]"}],"providerMetadata":{"dateUpdated":"2026-08-15T05:59:05.127Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434"},{"url":"https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8"},{"url":"https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c"},{"url":"https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0"},{"url":"https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26"}],"title":"tracing: Bound synthetic-field strings with seq_buf","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74391","datePublished":"2026-08-15T05:59:05.127Z","dateReserved":"2026-08-15T05:44:03.891Z","dateUpdated":"2026-08-15T05:59:05.127Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:41","lastModifiedDate":"2026-08-15 06:22:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74391","Ordinal":"1","Title":"tracing: Bound synthetic-field strings with seq_buf","CVE":"CVE-2026-74391","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74391","Ordinal":"1","NoteData":"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 ]","Type":"Description","Title":"tracing: Bound synthetic-field strings with seq_buf"}]}}}