CVE-2026-43481: Kernel Memory Corruption in Linux Kernel

The vulnerability allows for a double-free condition, where the same memory buffer is freed twice. This can lead to a crash of the net_shapers subsystem, potentially causing a denial-of-service (DoS) for the affected system. An attacker could trigger this by sending specially crafted network shaping requests. While the immediate impact is a DoS, a successful exploitation could potentially be chained with other vulnerabilities to achieve more severe consequences, such as arbitrary code execution, although this is not directly demonstrated in the vulnerability description. The blast radius is limited to the system running the vulnerable kernel.

1. 予約済み2026-05-01
2. 公開日2026-05-13

The primary mitigation is to upgrade the Linux Kernel to version 57885276cc16a2e2b76282c808a4e84cbecb3aae or later. If an immediate upgrade is not possible due to compatibility concerns or testing requirements, consider implementing temporary workarounds. While no specific WAF or proxy rules are directly applicable, ensuring robust network input validation can help prevent the transmission of malicious network shaping requests. Monitor system logs for any unusual kernel errors or crashes related to the net_shapers subsystem. After upgrading, confirm the fix by sending a series of network shaping requests and verifying that no crashes or errors occur.