Linux Kernel Open vSwitch Flow Delete Use-After-Free Information Disclosure Vulnerability
Vulnerability Details
This vulnerability allows local attackers to disclose sensitive information on affected installations of the Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of sw_flow_mask objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel.
Additional Details
Linux has issued an update to correct this vulnerability. More details can be found at:
https://github.com/torvalds/linux/commit/4e30317ff67a2eb12b4d890d39f72fd7e7117d48
Disclosure Timeline
- 2026-08-12 - Vulnerability reported to vendor
- 2026-09-14 - Coordinated public release of advisory
- 2026-09-14 - Advisory Updated
Credit
Anthony Laou Hine Tsuei @anarcheuz with Asymmetric Research
