Use-after-free in Linux kernel - CVE-2021-47232
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90088
CSH Severity: 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-2021-47232
CWE-ID: CWE-416
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 a use-after-free error within the j1939_session_skb_drop_old(), j1939_session_skb_queue(), j1939_session_skb_find_by_offset(), j1939_session_tx_dat(), j1939_xtp_txnext_receiver(), j1939_simple_txnext(), j1939_session_completed() and j1939_xtp_rx_dat_one() functions in net/can/j1939/transport.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/22cba878abf646cd3a02ee7c8c2cef7afe66a256
- https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22
- https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705
- https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.46
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.128