Memory leak in Linux kernel romfs

1) Memory leak

EUVDB-ID: #VU90488

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-29371

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to memory leak within the romfs_dev_read() function in fs/romfs/storage.c. A local user can gain access to sensitive information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.8 - 5.8.3

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.8.2:*:*:*:*:*:*:*

External links

https://bugs.chromium.org/p/project-zero/issues/detail?id=2077
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.4
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2935e0a3cec1ffa558eea90db6279cff83aa3592
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bcf85fcedfdd17911982a3e3564fcfec7b01eebd

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.