Use-after-free in Linux kernel

1) Use-after-free

EUVDB-ID: #VU28379

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10876

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.

A flaw was found in Linux kernel in the ext4 filesystem code. A use-after-free is possible in ext4_ext_remove_space() function when mounting and operating a crafted ext4 image.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 4.17.5

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.4.139:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.17.5:*:*:*:*:*:*:*

External links

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.55
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.17.6
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.140

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.