#VU91316 Buffer overflow in Linux kernel - CVE-2021-47107

Vulnerability identifier: #VU91316

Vulnerability 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-2021-47107

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to memory corruption within the nfsd_proc_rmdir() and nfsd_init_dirlist_pages() functions in fs/nfsd/nfsproc.c, within the nfsd3_proc_link() and nfsd3_init_dirlist_pages() functions in fs/nfsd/nfs3proc.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885
https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72

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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.