Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Linux kernel - CVE-2026-23294
Published: March 25, 2026
Vulnerability identifier: #VU124572
CSH Severity: Low
CVSS v4.0: 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-2026-23294
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 execute arbitrary code, escalate privileges, or cause a denial of service.
The vulnerability exists due to improper synchronization in the BPF device map (devmap) component when handling XDP frame transmission on PREEMPT_RT kernels. A local user can trigger concurrent access to the per-CPU xdp_dev_bulk_queue structure by exploiting preemption during bulk transmission operations, leading to use-after-free, memory corruption, and list manipulation races.
The issue arises specifically on PREEMPT_RT-enabled systems where local_bh_disable() does not prevent task preemption, allowing multiple tasks on the same CPU to simultaneously access shared queue structures.
How to mitigate CVE-2026-23294
Install security update from vendor's repository.