Memory leak in Linux kernel fs

1) Memory leak

EUVDB-ID: #VU89954

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-2021-47292

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

Exploit availability: No

Description

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

The vulnerability exists due to memory leak within the io_init_wq_offload() function in fs/io_uring.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.13 - 5.14 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.13:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.13.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc1:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/502731a03f27cba1513fbbff77e508185ffce5bb
https://git.kernel.org/stable/c/362a9e65289284f36403058eea2462d0330c1f24
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.6
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14

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.