#VU90052 Use-after-free in Linux kernel - CVE-2021-47506 

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Main Vulnerability Database Vulnerabilities #VU90052

#VU90052 Use-after-free in Linux kernel - CVE-2021-47506

Published: May 30, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU90052
Vulnerability risk: Low
CVSSv4.0: 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-2021-47506
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Linux kernel
Software vendor:
Linux Foundation

Description

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

The vulnerability exists due to a use-after-free error within the hash_delegation_locked(), unhash_delegation_locked() and nfsd4_cb_recall_prepare() functions in fs/nfsd/nfs4state.c. A local user can escalate privileges on the system.


Remediation

Install update from vendor's website.

External links