CVE-2026-43127

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix circular locking dependency in run_unpack_ex Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock. The deadlock scenario: 1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock. 2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone(). This creates an AB-BA deadlock. Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

CWE

CWE-667

Published

2026-05-06

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03
• https://git.kernel.org/stable/c/76016d15bbd90caa0ce7765fddf9bde8e943e601
• https://git.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015
• https://git.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66
• https://git.kernel.org/stable/c/d60f09d2d16c44a797d8cb67015cde2508720506

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