Linux · Linux Kernel · CVE-2023-31436
**Name of the Vulnerable Software and Affected Versions**
Linux kernel versions prior to 6.2.13
**Description**
The issue is related to the `qfq change class` function in the Linux kernel, which allows an out-of-bounds write because `lmax` can exceed `QFQ MIN LMAX`. This can potentially impact the confidentiality, integrity, and availability of protected information. The vulnerability may be exploited to gain local privilege escalation.
**Recommendations**
For Linux kernel versions prior to 6.2.13, update to version 6.2.13 or later to resolve the issue.
As a temporary workaround, consider restricting access to the `qfq change class` function in the `net/sched/sch qfq.c` file until a patch is available.