{"id":"CVE-2026-43127","title":"ntfs3: fix circular locking dependency in run_unpack_ex","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix circular locking dependency in run_unpack_ex\n\nSyzbot reported a circular locking dependency between wnd->rw_lock\n(sbi->used.bitmap) and ni->file.run_lock.\n\nT…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 57f7979aefdcef66326bda47e07ee0d8be64bf21 < d60f09d2d16c44a797d8cb67015cde2508720506","Linux >= db7fc56646cafe39599a4c21f1398e2bdfd5c185 < 76016d15bbd90caa0ce7765fddf9bde8e943e601","Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < b014372b62237521444ee51384549bdf48b79015","Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < b8d22d9d8260b0f4f4d8e2898c98037c9982ea66","Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03","Linux >= 6.6.66 < 6.6.160","Linux >= 6.12.5 < 6.12.114","Linux 6.13"],"published":"2026-05-06","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:40:09.954Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43127","references":[{"url":"https://git.kernel.org/stable/c/d60f09d2d16c44a797d8cb67015cde2508720506"},{"url":"https://git.kernel.org/stable/c/76016d15bbd90caa0ce7765fddf9bde8e943e601"},{"url":"https://git.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015"},{"url":"https://git.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66"},{"url":"https://git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03"}],"tags":["cve.org"],"epss":0.00124,"epssPercentile":0.0191,"ingestedAt":"2026-10-21T12:48:53.646Z","slug":"CVE-2026-43127","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix circular locking dependency in run_unpack_ex\n\nSyzbot reported a circular locking dependency between wnd->rw_lock\n(sbi->used.bitmap) and ni->file.run_lock.\n\nThe deadlock scenario:\n1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock.\n2. run_unpack_ex() takes wnd->rw_lock then tries to acquire\n   ni->file.run_lock inside ntfs_refresh_zone().\n\nThis creates an AB-BA deadlock.\n\nFix this by using down_read_trylock() instead of down_read() when\nacquiring run_lock in run_unpack_ex(). If the lock is contended,\nskip ntfs_refresh_zone() - the MFT zone will be refreshed on the\nnext MFT operation. This breaks the circular dependency since we\nnever block waiting for run_lock while holding wnd->rw_lock.\n\n## Affected\n\n- `Linux >= 57f7979aefdcef66326bda47e07ee0d8be64bf21 < d60f09d2d16c44a797d8cb67015cde2508720506`\n- `Linux >= db7fc56646cafe39599a4c21f1398e2bdfd5c185 < 76016d15bbd90caa0ce7765fddf9bde8e943e601`\n- `Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < b014372b62237521444ee51384549bdf48b79015`\n- `Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < b8d22d9d8260b0f4f4d8e2898c98037c9982ea66`\n- `Linux >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 < 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03`\n- `Linux >= 6.6.66 < 6.6.160`\n- `Linux >= 6.12.5 < 6.12.114`\n- `Linux 6.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}