{"cve":"CVE-2022-49779","nvd":{"published":"2025-05-01T15:16:01.080","modified":"2026-06-17T05:19:07.590","status":"Analyzed","description":"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   <TASK>\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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370","https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb","https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127","https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8","https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2022-49779","score":0.0022,"percentile":0.12621,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}