Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: exfat: fix improper check of dentry.stream.valid_size We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang. Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue. This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.
References
- https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2
- https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad
- https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea
FAQ
What is CVE-2025-40287?
CVE-2025-40287 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: exfat: fix improper check of dentry.stream.valid_size We found an infinite loop bug in the exFAT file system that can lead to a De...
How severe is CVE-2025-40287?
CVSS scoring is not yet available for CVE-2025-40287. Check NVD for updates.
Is there a patch for CVE-2025-40287?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.