{"id":"CVE-2022-49892","revision":null,"records":[{"revision":"b31da443a914462086207ec5a51c89ee","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-49892","aliases":[],"title":"ftrace: Fix use-after-free for dynamic ftrace_ops","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix use-after-free for dynamic ftrace_ops\n\nKASAN reported a use-after-free with ftrace ops [1]. It was found from\nvmcore that perf had registered two ops with the same content\nsuccessively, both dynamic. After unregistering the second ops, a\nuse-after-free occurred.\n\nIn ftrace_shutdown(), when the second ops is unregistered, the\nFTRACE_UPDATE_CALLS command is not set because there is another enabled\nops with the same content. Also, both ops are dynamic and the ftrace\ncallback function is ftrace_ops_list_func, so the\nFTRACE_UPDATE_TRACE_FUNC command will not be set. Eventually the value\nof 'command' will be 0 and ftrace_shutdown() will skip the rcu\nsynchronization.\n\nHowever, ftrace may be activated. When the ops is released, another CPU\nmay be accessing the ops. Add the missing synchronization to fix this\nproblem.\n\n[1]\nBUG: KASAN: use-after-free in __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]\nBUG: KASAN: use-after-free in ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049\nRead of size 8 at addr ffff56551965bbc8 by task syz-executor.2/14468\n\nCPU: 1 PID: 14468 Comm: syz-executor.2 Not tainted 5.10.0 #7\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132\n show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1b4/0x248 lib/dump_stack.c:118\n print_address_description.constprop.0+0x28/0x48c mm/kasan/report.c:387\n __kasan_report mm/kasan/report.c:547 [inline]\n kasan_report+0x118/0x210 mm/kasan/report.c:564\n check_memory_region_inline mm/kasan/generic.c:187 [inline]\n __asan_load8+0x98/0xc0 mm/kasan/generic.c:253\n __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]\n ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049\n ftrace_graph_call+0x0/0x4\n __might_sleep+0x8/0x100 include/linux/perf_event.h:1170\n __might_fault mm/memory.c:5183 [inline]\n __might_fault+0x58/0x70 mm/memory.c:5171\n do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]\n strncpy_from_user+0x1f4/0x4b0 lib/strncpy_from_user.c:139\n getname_flags+0xb0/0x31c fs/namei.c:149\n getname+0x2c/0x40 fs/namei.c:209\n [...]\n\nAllocated by task 14445:\n kasan_save_stack+0x24/0x50 mm/kasan/common.c:48\n kasan_set_track mm/kasan/common.c:56 [inline]\n __kasan_kmalloc mm/kasan/common.c:479 [inline]\n __kasan_kmalloc.constprop.0+0x110/0x13c mm/kasan/common.c:449\n kasan_kmalloc+0xc/0x14 mm/kasan/common.c:493\n kmem_cache_alloc_trace+0x440/0x924 mm/slub.c:2950\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:675 [inline]\n perf_event_alloc.part.0+0xb4/0x1350 kernel/events/core.c:11230\n perf_event_alloc kernel/events/core.c:11733 [inline]\n __do_sys_perf_event_open kernel/events/core.c:11831 [inline]\n __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723\n __arm64_sys_perf_event_open+0x6c/0x80 kernel/events/core.c:11723\n [...]\n\nFreed by task 14445:\n kasan_save_stack+0x24/0x50 mm/kasan/common.c:48\n kasan_set_track+0x24/0x34 mm/kasan/common.c:56\n kasan_set_free_info+0x20/0x40 mm/kasan/generic.c:358\n __kasan_slab_free.part.0+0x11c/0x1b0 mm/kasan/common.c:437\n __kasan_slab_free mm/kasan/common.c:445 [inline]\n kasan_slab_free+0x2c/0x40 mm/kasan/common.c:446\n slab_free_hook mm/slub.c:1569 [inline]\n slab_free_freelist_hook mm/slub.c:1608 [inline]\n slab_free mm/slub.c:3179 [inline]\n kfree+0x12c/0xc10 mm/slub.c:4176\n perf_event_alloc.part.0+0xa0c/0x1350 kernel/events/core.c:11434\n perf_event_alloc kernel/events/core.c:11733 [inline]\n __do_sys_perf_event_open kernel/events/core.c:11831 [inline]\n __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723\n [...]","state":0,"publishedAt":"2025-05-01T14:10:35.815+00:00","modifiedAt":"2026-10-15T21:31:17.289+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/trace/ftrace.c\"\n ],\n \"versions\": [\n {\n \"version\": \"edb096e00724f02db5f6ec7900f3bbd465c6c76f\",\n \"lessThan\": \"ea5f2fd4640ecbb9df969bf8bb27733ae2183169\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"edb096e00724f02db5f6ec7900f3bbd465c6c76f\",\n \"lessThan\": \"88561a66777e7a2fe06638c6dcb22a9fae0b6733\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"edb096e00724f02db5f6ec7900f3bbd465c6c76f\",\n \"lessThan\": \"cc1b9961a0ceb70f6ca4e2f4b8bb71c87c7a495c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"edb096e00724f02db5f6ec7900f3bbd465c6c76f\",\n \"lessThan\": \"0e792b89e6800cd9cb4757a76a96f7ef3e8b6294\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a60e407b961e818541ff7924afa8e51fbdb21a61\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed1bf4397d2219d4b9ec2d5517416ba102186650\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"100553e197e2c41eccf9fa04b2be9cd11ae21215\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"30d3c1c9c9dd31b3c3a5aa0f4f40f1e321c6c791\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4.1.45\",\n \"lessThan\": \"4.2\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.4.89\",\n \"lessThan\": \"4.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.9.52\",\n \"lessThan\": \"4.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.13.4\",\n \"lessThan\": \"4.14\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/trace/ftrace.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.154\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.78\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.0.8\",\n \"lessThanOrEqual\": \"6.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ea5f2fd4640ecbb9df969bf8bb27733ae2183169","https://git.kernel.org/stable/c/88561a66777e7a2fe06638c6dcb22a9fae0b6733","https://git.kernel.org/stable/c/cc1b9961a0ceb70f6ca4e2f4b8bb71c87c7a495c","https://git.kernel.org/stable/c/0e792b89e6800cd9cb4757a76a96f7ef3e8b6294"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49892","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-49892","identifiers":["CVE-2022-49892"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-cf42ce381925452e80080f8b2e604076","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T14:11:39.487584+00:00","lastSuccessAt":"2026-11-09T14:11:39.5496284+00:00","error":null,"lastVerifiedAt":"2026-11-09T14:11:39.5496284+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T14:04:00.1516715+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T14:04:00.1516715+00:00","lastSuccessAt":"2026-11-09T14:04:00.2978136+00:00","error":null,"lastVerifiedAt":"2026-11-09T14:04:00.297814+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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