Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_do_mkdir() debug print ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to unlock on failure."), vfs_mkdir() calls end_creating() on the input dentry on failure and may replace it on success, so the post-call %pd can use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled. Print the dentry before the call and only the result afterward.
References
- https://git.kernel.org/stable/c/719bd33ab359c539a68a278c15a97deb77565cdb
- https://git.kernel.org/stable/c/ae146bc1abdeb4607abf2975b858c053024e8ac1
FAQ
What is CVE-2026-98921?
CVE-2026-98921 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_do_mkdir() debug print ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0...
How severe is CVE-2026-98921?
CVSS scoring is not yet available for CVE-2026-98921. Check NVD for updates.
Is there a patch for CVE-2026-98921?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.