{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74471", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.902Z", "datePublished": "2026-08-15T12:27:08.128Z", "dateUpdated": "2026-08-19T16:37:20.725Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:37:20.725Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Check return value of __register_event() in trace_module_add_events()\n\ntrace_module_add_events() ignores the return value of __register_event()\nand unconditionally calls __add_event_to_tracers() for each event.\n\nIf __register_event() fails (for example, if event_init() fails), the\ntrace_event_call is not added to ftrace_events list, but\n__add_event_to_tracers() still creates a trace_event_file pointing to it.\nIf module loading subsequently fails and module memory is freed, tracing\nstate retains a stale trace_event_call pointer in trace_event_file,\nleading to a use-after-free when tracefs or tracing subsystem operations\nare later executed.\n\nFix this by checking the return value of __register_event() and only\ncalling __add_event_to_tracers() if event registration succeeded." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only via local init_module/finit_module module loading (MODULE_STATE_COMING notifier) and subsequent tracefs/tracing operations on poisoned event files; there is no network, adjacent-wireless, or physical-device input path into trace_module_add_events() or the stale trace_event_file dereferences.\nAC:L - An attacker can deterministically craft a module whose trace events fail event_init()/__register_event() while __add_event_to_tracers() still runs, then force module-load failure or rmmod to free module memory; no uncontrollable race, rare kernel config, or victim-specific memory layout is required.\nPR:L - Triggering the UAF requires only local tracefs/tracing access, which tracing_check_open() gates solely with LOCKDOWN_TRACEFS and DAC (no capable() check), commonly granted to tracing-group/Android/ChromeOS diagnostics users; priming stale pointers via init_module uses capable(CAP_SYS_MODULE) but is achievable on permissive dev/container hosts loading attacker modules.\nUI:N - Once tracefs is accessible, the attacker can read/write event enable/format files or invoke tracing helpers that iterate tr->events and dereference the stale trace_event_call without any separate victim user performing mounts, clicks, or configuration changes.\nS:U - The use-after-free corrupts kernel tracing heap/metadata within the same OS security authority and enables local privilege escalation; it does not cross VM, container, IOMMU, or hardware trust boundaries.\nC:H - Stale trace_event_file->event_call pointers reference freed module slab memory; subsequent trace_event_name(), call->class, and reg/unreg callbacks read attacker-influenced reclaimed heap contents, giving an arbitrary kernel memory read primitive typical of UAF bugs.\nI:H - Operations such as __ftrace_event_enable_disable() invoke call->class->reg() through the dangling trace_event_call and manipulate event flags/filters on reclaimed objects, providing controllable kernel writes and a standard UAF path to code execution.\nA:H - Dereferencing freed module-resident trace_event_call structures from tracefs or tracing subsystem operations readily causes kernel oops/panic; even without full exploitation, the UAF reliably threatens system availability and can be retriggered at will." } ] } ], "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.c" ], "versions": [ { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "3bf965a2827c44f03294107703e7ba53fbd0a69a", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "9d6d79744f01eacaf3d5522f4fcd59939581abfd", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "54b7a358f6399c1242d2fb7f4f96085af34baa5e", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "22f954f7a8afe975e85517aff41b35defe05144b", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "000765dcdc3edf128990762790543adc4b868f6c", "status": "affected", "versionType": "git" }, { "version": "ae63b31e4d0e2ec09c569306ea46f664508ef717", "lessThan": "ac8719969e6c3c54e939834df812bc41f25453cf", "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.c" ], "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "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": "3.10", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a" }, { "url": "https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd" }, { "url": "https://git.kernel.org/stable/c/54b7a358f6399c1242d2fb7f4f96085af34baa5e" }, { "url": "https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5" }, { "url": "https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b" }, { "url": "https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca" }, { "url": "https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c" }, { "url": "https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf" } ], "title": "tracing: Check return value of __register_event() in trace_module_add_events()", "x_generator": { "engine": "bippy-1.2.0" } } } }