Linux · Linux Kernel · CVE-2022-49625
**Name of the Vulnerable Software and Affected Versions**
Linux kernel versions prior to 5.14.0-119.el9.x86 64
**Description**
A kernel panic can occur in the Linux kernel when creating Virtual Functions (VFs) due to a bug in the `efx ef10 try update nic stats vf` function. This happens when releasing a DMA coherent buffer and unmapping memory with `vunmap` in an IRQ context or with BH disabled, causing a crash. The issue is triggered by the `BUG ON(in interrupt())` line in `vunmap`. Log messages indicate a kernel BUG at `mm/vmalloc.c:2727` with an invalid opcode.
**Recommendations**
For Linux kernel version 5.14.0-119.el9.x86 64 and earlier, apply the patch that reenables BH to release the buffer, fixing the kernel panic issue when creating VFs.