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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003< 87f827d53bd0688597bda63ae95908e2ad39bac0 affected
1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003< 67ce8034dc0278ddd88cad93d4218a945180dddd affected
1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003< 6bc58b4c53795ab5fe00648344aa7d9d61175f90 affected
1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003< 13c1d24803d5b0446b3f6f0fdd67e07ac1fdc7bf affected
1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003< 79c1587b6cda74deb0c86fc7ba194b92958c793c affected
5.7 affected
< 5.7 unaffected
6.1.183≤ 6.1.* unaffected
… +4 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 ~ 87f827d53bd0688597bda63ae95908e2ad39bac0 -
Linux Linux 5.7 -

II. Public POCs for CVE-2025-40307

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III. Intelligence Information for CVE-2025-40307

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Patches & Fixes for CVE-2025-40307 (2)

Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total

CVE-2023-53751 9.8 CRITICAL cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
CVE-2025-40320 9.8 CRITICAL smb: client: fix potential cfid UAF in smb2_query_info_compound
CVE-2023-53769 9.3 CRITICAL virt/coco/sev-guest: Double-buffer messages
CVE-2023-53764 8.8 HIGH wifi: ath12k: Handle lock during peer_id find
CVE-2023-53762 8.8 HIGH Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync
CVE-2025-40318 8.8 HIGH Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
CVE-2025-40292 8.4 HIGH virtio-net: fix received length check in big packets
CVE-2025-40309 8.0 HIGH Bluetooth: SCO: Fix UAF on sco_conn_free
CVE-2025-40302 7.8 HIGH media: videobuf2: forbid remove_bufs when legacy fileio is active
CVE-2025-40291 7.8 HIGH io_uring: fix regbuf vector size truncation
CVE-2025-40303 7.8 HIGH btrfs: ensure no dirty metadata is written back for an fs with errors
CVE-2023-53759 7.8 HIGH HID: hidraw: fix data race on device refcount
CVE-2025-40317 7.8 HIGH regmap: slimbus: fix bus_context pointer in regmap init calls
CVE-2025-40319 7.8 HIGH bpf: Sync pending IRQ work before freeing ring buffer
CVE-2025-40323 7.8 HIGH fbcon: Set fb_display[i]->mode to NULL when the mode is released
CVE-2023-53753 7.8 HIGH drm/amd/display: fix mapping to non-allocated address
CVE-2023-53752 7.8 HIGH net: deal with integer overflows in kmalloc_reserve()
CVE-2023-53747 7.8 HIGH vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF
CVE-2022-50623 7.8 HIGH fpga: prevent integer overflow in dfl_feature_ioctl_set_irq()
CVE-2022-50630 7.8 HIGH mm: hugetlb: fix UAF in hugetlb_handle_userfault

Showing top 20 of 82 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40307

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