What is CVE-2023-31083?

CVE-2023-31083 is a medium-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.7/10. Published 2023-04-24.

How severe is CVE-2023-31083?

Medium severity. CVSS v3 base score is 4.7 out of 10.

NULL pointer dereference in Linux Kernel

CVE-2023-31083

An issue was discovered in drivers/bluetooth/hci_ldisc.c in the Linux kernel 6.2. In hci_uart_tty_ioctl, there is a race condition between HCIUARTSETPROTO and HCIUARTGETPROTO. HCI_UART_PROTO_SET is set before hu->proto is set. A NULL pointer dereference may occur.

Vulnerability class: Race Condition

Published 2023-04-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Linux Kernel — versions 6.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-31083?: CVE-2023-31083 is a medium-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.7/10. Published 2023-04-24.
How severe is CVE-2023-31083?: Medium severity. CVSS v3 base score is 4.7 out of 10.