# CVE-2022-50266: kprobes: Fix check for probe enabled in kill_kprobe()

CVE-2022-50266 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50266, released September 15, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50266
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2025
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-50266

## Description

In the Linux kernel, the following vulnerability has been resolved:  kprobes: Fix check for probe enabled in kill_kprobe()  In kill_kprobe(), the check whether disarm_kprobe_ftrace() needs to be called always fails. This is because before that we set the KPROBE_FLAG_GONE flag for kprobe so that "!kprobe_disabled(p)" is always false.  The disarm_kprobe_ftrace() call introduced by commit:    0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")  to fix the NULL pointer reference problem. When the probe is enabled, if we do not disarm it, this problem still exists.  Fix it by putting the probe enabled check before setting the KPROBE_FLAG_GONE flag.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50266](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50266.md) | Sep 15, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50266](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50266.md) | Sep 15, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50266](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50266.md) | Sep 15, 2025 |

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