CVE-2026-74391

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74391", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.891Z", "datePublished": "2026-08-15T05:59:05.127Z", "dateUpdated": "2026-10-30T12:29:55.331Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:29:55.331Z"}, "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 ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "9f8ef2e1e95a42044e614b0a5277e3f53f545135", "status": "affected", "versionType": "git"}, {"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "0c584c27f6649a93ec12061cc779a4bd8f7c1434", "status": "affected", "versionType": "git"}, {"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "88b901fdc1662b131ff908cbd017333b61e7acc8", "status": "affected", "versionType": "git"}, {"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "baa333b2700a7fa3529d504529c8c10060fd687c", "status": "affected", "versionType": "git"}, {"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "cf334620036ad2250e008c7e7bb6646a3938b7b0", "status": "affected", "versionType": "git"}, {"version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "lessThan": "f07883450eb14d1cf020b55d9f3a7ec5683bcd26", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9f8ef2e1e95a42044e614b0a5277e3f53f545135"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"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": "9f8ef2e1e95a42044e614b0a5277e3f53f545135", "status": "affected", "version": "02205a6752f223779a1b0e9e8ffacbea6e717851", "versionType": "git"}, {"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": "6.1.*", "status": "unaffected", "version": "6.1.191", "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", "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\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", "lastModified": "2026-10-30T13:19:56.620", "metrics": {}, "published": "2026-08-15T06:22:41.067", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f8ef2e1e95a42044e614b0a5277e3f53f545135"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: tracing: Bound synthetic-field strings with seq_buf", "id": "2516876", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516876"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Bound synthetic-field strings with seq_buf\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.\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[ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]", "A flaw was found in the tracing subsystem of the Linux kernel. This vulnerability occurs because synthetic field helpers use unbounded string concatenation (strcat()) when building synthetic variable names and generated history commands. An attacker providing excessively long input for key lists, field names, or saved filters could cause a buffer overflow. This could lead to a denial of service (DoS) or other unpredictable system behavior."], "name": "CVE-2026-74391", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74391\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74391\nhttps://lore.kernel.org/linux-cve-announce/2026081507-CVE-2026-74391-e5be@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[02205a6752f223779a1b0e9e8ffacbea6e717851,0c584c27f6649a93ec12061cc779a4bd8f7c1434)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[02205a6752f223779a1b0e9e8ffacbea6e717851,88b901fdc1662b131ff908cbd017333b61e7acc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[02205a6752f223779a1b0e9e8ffacbea6e717851,baa333b2700a7fa3529d504529c8c10060fd687c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[02205a6752f223779a1b0e9e8ffacbea6e717851,cf334620036ad2250e008c7e7bb6646a3938b7b0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[02205a6752f223779a1b0e9e8ffacbea6e717851,f07883450eb14d1cf020b55d9f3a7ec5683bcd26)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T13:30:04.657045+00:00", "updated": "2026-08-22T02:00:17.903991+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}