CVE-2025-40243
7.8 · HIGHOverview
CVE-2025-40243 is a high-severity vulnerability. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
hfs: fix KMSAN uninit-value issue in hfs_find_set_zero_bits()
The syzbot reported issue in hfs_find_set_zero_bits():
=====================================================
BUG: KMSAN: uninit-value in hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45
hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45
hfs_vbm_search_free+0x13c/0x5b0 fs/hfs/bitmap.c:151
hfs_extend_file+0x6a5/0x1b00 fs/hfs/extent.c:408
hfs_get_block+0x435/0x1150 fs/hfs/extent.c:353
__block_write_begin_int+0xa76/0x3030 fs/buffer.c:2151
block_write_begin fs/buffer.c:2262 [inline]
cont_write_begin+0x10e1/0x1bc0 fs/buffer.c:2601
hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52
cont_expand_zero fs/buffer.c:2528 [inline]
cont_write_begin+0x35a/0x1bc0 fs/buffer.c:2591
hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52
hfs_file_truncate+0x1d6/0xe60 fs/hfs/extent.c:494
hfs_inode_setattr+0x964/0xaa0 fs/hfs/inode.c:654
notify_change+0x1993/0x1aa0 fs/attr
Remediation
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
References
Frequently Asked Questions
What is CVE-2025-40243?
CVE-2025-40243 is a high-severity vulnerability. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2025-40243?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-40243?
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-40243?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-40243 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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