Use-after-free in Linux kernel accel driver

1) Use-after-free

EUVDB-ID: #VU90050

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-2021-47500

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 a use-after-free error within the mma8452_trigger_setup() function in drivers/iio/accel/mma8452.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.16 rc8

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.0-57:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.7:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba
https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96
https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb
https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8
https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e
https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1
https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739
https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.258
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.295
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.293
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165

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.