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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-tools-debuginfoUpgrade bpftool6.18Upgrade kernel6.18-libbpf-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade python3-perf6.18Upgrade kernel6.18-libbpf-develUpgrade perf6.18Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-develUpgrade kernel6.18-libbpf-staticUpgrade kernel6.18-libbpfUpgrade bpftool6.18-debuginfoUpgrade kernel-livepatch-6.18.16-18.222Upgrade kernel6.18-tools-develUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-modules-extraUpgrade kernel6.18Upgrade kernel6.18-toolsUpgrade kernel6.18-debuginfo | May 19, 2026 | May 6, 2026 |
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