{"id":"DEBIAN-CVE-2022-49779","details":"In the Linux kernel, the following vulnerability has been resolved:  kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case  In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free:    Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)   WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0   Modules linked in: testKprobe_007(-)   CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18   [...]   Call Trace:    \u003cTASK\u003e    __disable_kprobe+0xcd/0xe0    __unregister_kprobe_top+0x12/0x150    ? mutex_lock+0xe/0x30    unregister_kprobes.part.23+0x31/0xa0    unregister_kprobe+0x32/0x40    __x64_sys_delete_module+0x15e/0x260    ? do_user_addr_fault+0x2cd/0x6b0    do_syscall_64+0x3a/0x90    entry_SYSCALL_64_after_hwframe+0x63/0xcd    [...]  For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.","modified":"2026-09-01T16:05:33.406927712Z","published":"2025-05-01T15:16:01.080Z","upstream":["CVE-2022-49779"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49779"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49779.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49779.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49779.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}