CVE-2025-40307 exfat: validate cluster allocation bits of the allocation bitmap

In the Linux kernel, the following vulnerability has been resolved: exfat: validate cluster allocation bits of the allocation bitmap syzbot created an exfat image with cluster bits not set for the allocation bitmap. exfat-fs reads and uses the allocation bitmap without checking this. The problem ...

CVE-2025-40307 exfat: validate cluster allocation bits of the allocation bitmap

In the Linux kernel, the following vulnerability has been resolved: exfat: validate cluster allocation bits of the allocation bitmap syzbot created an exfat image with cluster bits not set for the allocation bitmap. exfat-fs reads and uses the allocation bitmap without checking this. The problem ...

CVE-2025-40307

CVE-2025-40307 affects the Linux kernel's exfat implementation. The issue arises from invalid validation of cluster allocation bits in the allocation bitmap, allowing a cluster (potentially 6 when the start cluster is 6) to be allocated during mkdir, which can lead to deletion/reallocation of dir...