CVE-2025-40307
Last modified
CVE-2025-40307 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.
Description
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 is that if the start cluster of the allocation bitmap is 6, cluster 6 can be allocated when creating a directory with mkdir. exfat zeros out this cluster in exfat_mkdir, which can delete existing entries. This can reallocate the allocated entries. In addition, the allocation bitmap is also zeroed out, so cluster 6 can be reallocated. This patch adds exfat_test_bitmap_range to validate that clusters used for the allocation bitmap are correctly marked as in-use.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 6bc58b4c53795ab5fe00648344aa7d9d61175f90; >= 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 13c1d24803d5b0446b3f6f0fdd67e07ac1fdc7bf; >= 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 79c1587b6cda74deb0c86fc7ba194b92958c793c |
| Linux | Linux | 5.7 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
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