#VU96514 Use-after-free in Linux kernel - CVE-2024-43891
Vulnerability identifier: #VU96514
Vulnerability risk: Low
CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2024-43891
CWE-ID:
CWE-416
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the trigger_start(), event_trigger_regex_open() and event_trigger_regex_write() functions in kernel/trace/trace_events_trigger.c, within the event_inject_write() function in kernel/trace/trace_events_inject.c, within the hist_show() and hist_debug_show() functions in kernel/trace/trace_events_hist.c, within the event_enable_read(), event_enable_write(), f_next(), f_show(), event_filter_read(), event_filter_write() and event_callback() functions in kernel/trace/trace_events.c. A local user can escalate privileges on the system.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Linux kernel: 6.6, 6.6 rc1, 6.6 rc2, 6.6 rc3, 6.6 rc4, 6.6 rc5, 6.6 rc6, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 6.6.5, 6.6.6, 6.6.7, 6.6.8, 6.6.9, 6.6.10, 6.6.11, 6.6.12, 6.6.13, 6.6.14, 6.6.15, 6.6.16, 6.6.17, 6.6.18, 6.6.19, 6.6.20, 6.6.21, 6.6.22, 6.6.23, 6.6.24, 6.6.25, 6.6.26, 6.6.27, 6.6.28, 6.6.29, 6.6.30, 6.6.31, 6.6.32, 6.6.33, 6.6.34, 6.6.35, 6.6.36, 6.6.37, 6.6.38, 6.6.39, 6.6.40, 6.6.41, 6.6.42, 6.6.43, 6.6.44, 6.6.45, 6.6.46, 6.6.47, 6.6.48, 6.10, 6.10.1, 6.10.2, 6.10.3, 6.10.4
External links
https://git.kernel.org/stable/c/531dc6780d94245af037c25c2371c8caf652f0f9
https://git.kernel.org/stable/c/b1560408692cd0ab0370cfbe9deb03ce97ab3f6d
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.10.5
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.11
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.49
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
