Luís Henriques

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 5.19.0-rc8+ **Description** A bug in the Linux kernel's ext4 file system has been resolved. The issue occurred when parsing extents and the number of entries (`eh->eh entries`) was zero, but the depth (`eh depth`) was greater than zero. This led to problems because `EXT FIRST INDEX()` and `EXT LAST INDEX()` returned garbage values, resulting in a kernel bug. The patch adds an extra check in ` ext4 ext check()` to verify that `eh entries` is not zero when `eh depth` is greater than zero. **Recommendations** To resolve this issue, update the Linux kernel to a version newer than 5.19.0-rc8+. As a temporary workaround, consider disabling the `ext4 ext binsearch idx()` function until a patch is available. However, this is not a recommended solution as it may cause other issues. The best course of action is to update the kernel to a version that includes the fix for this vulnerability.