Use after free in Linux kernel fs

1) Use after free

EUVDB-ID: #VU92420

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-2020-14381

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to use after free error within the get_futex_key_refs(), drop_futex_key_refs() and futex_setup_timer() functions in kernel/futex.c, within the inode_init_always() function in fs/inode.c. A local user can execute arbitrary code.

Mitigation

Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

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

External links

https://bugzilla.redhat.com/show_bug.cgi?id=1874311
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8019ad13ef7f64be44d4f892af9c840179009254

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.