Shankara Pailoor

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 4.17.1 **Description** A race condition exists between the fchownat and close functions when they target the same socket file descriptor. This issue is related to the sock close and sockfs setattr functions. The fchownat function does not increment the file descriptor reference count, allowing the close function to set the socket to NULL during fchownat's execution. This leads to a NULL pointer dereference and can cause a system crash. **Recommendations** For Linux kernel versions prior to 4.17.1, update to version 4.17.1 or later to resolve the issue.

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions through 4.17.1 **Description** A memory corruption bug in JFS can be triggered by calling setxattr twice with two different extended attribute names on the same file. This issue can be triggered by an unprivileged user with the ability to create files and execute programs. A kmalloc call is incorrect, leading to slab-out-of-bounds in jfs xattr. **Recommendations** For Linux kernel versions through 4.17.1, as a temporary workaround, consider restricting access to the setxattr function until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.