#VU91197 Buffer overflow in Linux kernel - CVE-2021-47496
Published: June 5, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91197
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-2021-47496
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to memory corruption within the tls_err_abort(), tls_tx_records(), tls_push_record(), tls_sw_recvmsg() and tls_sw_splice_read() functions in net/tls/tls_sw.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb
- https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19
- https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a
- https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.77
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.157