# CVE-2022-49779: linux: In the Linux kernel, the following vulnerability has been resolved:  kprobes: Skip clearing aggrprobe's post_handler...

CVE-2022-49779 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49779, released May 1, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49779
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

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:    <TASK>    __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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49779](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49779.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49779](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49779.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49779](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49779.md) | May 1, 2025 |

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