Out-of-bounds write in Linux kernel

1) Out-of-bounds write

EUVDB-ID: #VU56817

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-2021-28660

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in the "rtw_wx_set_scan" in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c. A local user can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.11 - 5.11.6

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.11:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.11.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.11.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.11.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.11.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.11.6:*:*:*:*:*:*:*

External links

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=74b6b20df8cfe90ada777d621b54c32e69e27cd7
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TJPVQZPY3DHPV5I3IVNMSMO6D3PKZISX/
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
https://security.netapp.com/advisory/ntap-20210507-0008/
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.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.