Privilege escalation in Linux kernel USB driver

1) Use-after-free

EUVDB-ID: #VU26648

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-2019-19527

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to use-after-free error in the drivers/hid/usbhid/hiddev.c driver. A local user can use a malicious USB device 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: 5.2.1 - 5.2.9

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.2.9:*:*:*:*:*:*:*

External links

https://www.openwall.com/lists/oss-security/2019/12/03/4
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.10
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d4472d7bec39917b54e4e80245784ea5d60ce49
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9c09b214f30e3c11f9b0b03f89442df03643794d
https://lists.debian.org/debian-lts-announce/2020/01/msg00013.html
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html

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.