Vulnerability identifier: #VU90088

Vulnerability risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47232

CWE-ID: CWE-416

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 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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
http://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256
http://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22
http://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705
http://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678

---

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.