Xiuhong Wang

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 6.6.74 **Description** The issue arises from the Linux kernel's handling of the extent tree during its shrink operation. Specifically, when there is a huge number of extent nodes in the extent tree, the kernel may hold a read-write lock (rwlock) for an extremely long time, potentially triggering a kernel hang issue. This occurs because the rwlock is used to protect the core structure data of the extent tree during its shrink operation. The patch resolves this by shrinking the read extent node in batches, thereby reducing the critical region of the rwlock and avoiding its prolonged hold. **Recommendations** For Linux kernel versions prior to 6.6.74, update to version 6.6.74 or later to resolve the issue. As a temporary workaround, consider applying configuration changes to minimize the risk of kernel hang issues, although specific details on such changes are not provided.

**Name of the Vulnerable Software and Affected Versions** Linux kernel (affected versions not specified) **Description** The vulnerability is related to the compress component of the Linux kernel and is caused by an incorrect calculation in the reserve cblocks counting when out of space. This issue can lead to a file becoming unrepairable if it only needs one direct node and certain operations are performed. The vulnerability can be exploited to cause a denial of service. The issue is resolved by setting the fsck flag to fix the problem after a patch is applied. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.