Race condition in Linux kernel - CVE-2026-43023
Published: May 2, 2026
Vulnerability identifier: #VU128892
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43023
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition leading to use-after-free in sco_sock_connect() when handling concurrent connect() calls on the same Bluetooth SCO socket. A local user can issue concurrent connect() syscalls on the same socket to cause a denial of service.
The issue can revive a BT_CLOSED and SOCK_ZAPPED socket back to BT_CONNECT during concurrent execution.
How to mitigate CVE-2026-43023
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/7e296ffdab5bdab718dff7c14288fdcb9154fa27
- https://git.kernel.org/stable/c/8a5b0135d4a5d9683203a3d9a12a711ccec5936b
- https://git.kernel.org/stable/c/98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d
- https://git.kernel.org/stable/c/adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0
- https://git.kernel.org/stable/c/d002bd11024bd231bcb606877e33951ffb7bed14
- https://git.kernel.org/stable/c/dabf22269242e2f2bf44c43fcdc2fa763df7f9cc