CVE-2025-40307— exfat: validate cluster allocation bits of the allocation bitmap
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I. Basic Information for CVE-2025-40307
Vulnerability Information
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Vulnerability Title
exfat: validate cluster allocation bits of the allocation bitmap
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证分配位图的簇分配位，可能导致数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40307
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Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total
| CVE-2022-50630 | mm: hugetlb: fix UAF in hugetlb_handle_userfault | |
| CVE-2023-53752 | net: deal with integer overflows in kmalloc_reserve() | |
| CVE-2022-50627 | wifi: ath11k: fix monitor mode bringup crash | |
| CVE-2022-50628 | drm/gud: Fix UBSAN warning | |
| CVE-2022-50626 | media: dvb-usb: fix memory leak in dvb_usb_adapter_init() | |
| CVE-2022-50623 | fpga: prevent integer overflow in dfl_feature_ioctl_set_irq() | |
| CVE-2022-50622 | ext4: fix potential memory leak in ext4_fc_record_modified_inode() | |
| CVE-2022-50621 | dm: verity-loadpin: Only trust verity targets with enforcement | |
| CVE-2022-50620 | f2fs: fix to invalidate dcc->f2fs_issue_discard in error path | |
| CVE-2022-50624 | net: netsec: fix error handling in netsec_register_mdio() | |
| CVE-2022-50629 | wifi: rsi: Fix memory leak in rsi_coex_attach() | |
| CVE-2023-53742 | kcsan: Avoid READ_ONCE() in read_instrumented_memory() | |
| CVE-2023-53743 | PCI: Free released resource after coalescing | |
| CVE-2023-53744 | soc: ti: pm33xx: Fix refcount leak in am33xx_pm_probe | |
| CVE-2023-53745 | um: vector: Fix memory leak in vector_config | |
| CVE-2023-53746 | s390/vfio-ap: fix memory leak in vfio_ap device driver | |
| CVE-2023-53747 | vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF | |
| CVE-2023-53748 | media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup | |
| CVE-2023-53750 | pinctrl: freescale: Fix a memory out of bounds when num_configs is 1 | |
| CVE-2023-53751 | cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname |
Showing top 20 of 82 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
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scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
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scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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