Use-after-free in Linux kernel bus mhi driver

1) Use-after-free

EUVDB-ID: #VU90093

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-2021-47278

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 mhi_pci_remove() function in drivers/bus/mhi/pci_generic.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.12 - 5.13 rc5

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc8:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.3:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/c597d5c59c7a6417dba06590f59b922e01188e8d
https://git.kernel.org/stable/c/0b67808ade8893a1b3608ddd74fac7854786c919
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13

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.