Use-after-free in Linux kernel atm driver

1) Use-after-free

EUVDB-ID: #VU90135

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-2021-47357

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 ia_module_exit() function in drivers/atm/iphase.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.14 rc7

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/9e161687855175334ca93c6c3ccb221731194479
https://git.kernel.org/stable/c/a832ee2f2145f57443b2d565f8cb5490e8339f42
https://git.kernel.org/stable/c/bcdd2be48edd8c6867fb44112cb8d18086beae29
https://git.kernel.org/stable/c/89ce0b0747f319eb70f85bc820dcc43cebbd5417
https://git.kernel.org/stable/c/c9172498d4d62c9b64e5fb37c1ee0343e65fe51b
https://git.kernel.org/stable/c/e759ff76ebbbfcdcf83b6634c54dc47828573d8b
https://git.kernel.org/stable/c/b58d246a058ae88484758cd4ab27b3180fd5ecf8
https://git.kernel.org/stable/c/d1fb12412874c94ad037e11d0ecdd1140a439297
https://git.kernel.org/stable/c/1c72e6ab66b9598cac741ed397438a52065a8f1f
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.240
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.198
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.276
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.276
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.51
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.18
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.133

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.