{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74636", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.922Z", "datePublished": "2026-08-22T15:32:16.026Z", "dateUpdated": "2026-08-22T15:32:16.026Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:16.026Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix race between update_event_fields and, event_define_fields\n\nThe following sequence may leads race between event_define_fields()\nand update_event_fields():\n\n CPU0 (loads module A) CPU1 (loads module B)\n =============================== ===============================\n load_module(A) load_module(B)\n notifier_call_chain notifier_call_chain\n trace_module_notify trace_module_notify\n mutex_lock(&event_mutex) trace_event_update_all()\n trace_module_add_events(A) down_write(&trace_event_sem)\n __register_event(call_A)\n __add_event_to_tracers(call_A)\n event_define_fields(call_A)\n for each f: list_for_each_entry(field,\n list_add(&f->link, &class->fields, link)\n &class->fields) field = class->fields->next;\n\nWhere access to the class->fields is not protected by the event_mutex in\ntrace_event_update_all().\n\nThis produces the following panic:\n Unable to handle kernel access ... at virtual address 0000000000000018\n pc : update_event_fields+0xf8/0x368\n Call trace:\n update_event_fields+0xf8/0x368\n trace_event_update_all+0x7c/0x2b4\n trace_module_notify+0x4c/0x1dc\n notifier_call_chain+0x84/0x168\n blocking_notifier_call_chain_robust+0x64/0xd4\n load_module+0x10c8/0x123c\n __arm64_sys_finit_module+0x230/0x31c\n\nFix by taking event_mutex in trace_event_update_all() before\ntrace_event_sem." } ], "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": "7c6bd60999f32138e3b73fd97ea11ef47a94de25", "lessThan": "4e39f7b4d9d36508c53e89e6cbc640728df870b5", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "a30d421468300b1e7b2f233136aeb2db8013f555", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "e5f1d301b4bdaa4206db251fdc691f623162b0a8", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "fdeb190b0905a6aaed1e5d6adfb8613214748d7d", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "ed49684e69f846bf50b5050651ccdb87cfd152c0", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "f128740f39ab28d1f4ad5bdd10f3e117eec0c374", "status": "affected", "versionType": "git" }, { "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48", "lessThan": "c3730b8373bb5059d735509b9e6a00d7eb337d7c", "status": "affected", "versionType": "git" }, { "version": "55defdf935fab9f2989a197aae1042c082d9a343", "status": "affected", "versionType": "git" }, { "version": "0c53a5c80e6e286733381a1d9f255ba4039e2e45", "status": "affected", "versionType": "git" }, { "version": "5.15.33", "lessThan": "5.15.216", "status": "affected", "versionType": "semver" }, { "version": "5.16.19", "lessThan": "5.17", "status": "affected", "versionType": "semver" }, { "version": "5.17.2", "lessThan": "5.18", "status": "affected", "versionType": "semver" } ] }, { "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": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "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": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "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": "5.15.33", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4e39f7b4d9d36508c53e89e6cbc640728df870b5" }, { "url": "https://git.kernel.org/stable/c/a30d421468300b1e7b2f233136aeb2db8013f555" }, { "url": "https://git.kernel.org/stable/c/e5f1d301b4bdaa4206db251fdc691f623162b0a8" }, { "url": "https://git.kernel.org/stable/c/fdeb190b0905a6aaed1e5d6adfb8613214748d7d" }, { "url": "https://git.kernel.org/stable/c/ed49684e69f846bf50b5050651ccdb87cfd152c0" }, { "url": "https://git.kernel.org/stable/c/f128740f39ab28d1f4ad5bdd10f3e117eec0c374" }, { "url": "https://git.kernel.org/stable/c/c3730b8373bb5059d735509b9e6a00d7eb337d7c" } ], "title": "tracing: Fix race between update_event_fields and, event_define_fields", 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