{"id":"CVE-2022-49779","summary":"kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case\n\nIn __unregister_kprobe_top(), if the currently unregistered probe has\npost_handler but other child probes of the aggrprobe do not have\npost_handler, the post_handler of the aggrprobe is cleared. If this is\na ftrace-based probe, there is a problem. In later calls to\ndisarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is\nNULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in\n__disarm_kprobe_ftrace() and may even cause use-after-free:\n\n  Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)\n  WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0\n  Modules linked in: testKprobe_007(-)\n  CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18\n  [...]\n  Call Trace:\n   \u003cTASK\u003e\n   __disable_kprobe+0xcd/0xe0\n   __unregister_kprobe_top+0x12/0x150\n   ? mutex_lock+0xe/0x30\n   unregister_kprobes.part.23+0x31/0xa0\n   unregister_kprobe+0x32/0x40\n   __x64_sys_delete_module+0x15e/0x260\n   ? do_user_addr_fault+0x2cd/0x6b0\n   do_syscall_64+0x3a/0x90\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n   [...]\n\nFor the kprobe-on-ftrace case, we keep the post_handler setting to\nidentify this aggrprobe armed with kprobe_ipmodify_ops. This way we\ncan disarm it correctly.","modified":"2026-04-03T13:14:30.830002703Z","published":"2025-05-01T14:09:14.445Z","related":["SUSE-SU-2025:01918-1","SUSE-SU-2025:01966-1","SUSE-SU-2025:02173-1","SUSE-SU-2025:02262-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49779.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49779.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49779"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0bc11ed5ab60c135aa764a62c02cd5ea68289de4"},{"fixed":"7b0007b28dd970176f2e297c06ae63eea2447127"},{"fixed":"7d606ae1abcc3eab5408e42444d789dc7def51b8"},{"fixed":"c49cc2c059b503e962c2f13a806c105f9b757df4"},{"fixed":"55788ebbe8b365b4375bd56b4ba7db79d393a370"},{"fixed":"5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49779.json"}}],"schema_version":"1.7.5"}