Use-after-free in Linux kernel

1) Use-after-free

EUVDB-ID: #VU22199

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-21008

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to use-after-free error in the file drivers/net/wireless/rsi/rsi_91x_mac80211.c. A remote attacker can use the function rsi_mac80211_detach to trigger use-after-free error and execute arbitrary code on the system with elevated privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.16.1 - 4.16.6

External links

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.7
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abd39c6ded9db53aa44c2540092bdd5fb6590fa8
http://lists.debian.org/debian-lts-announce/2019/09/msg00025.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.