{"id":"CVE-2026-43127","state":"PUBLISHED","title":"ntfs3: fix circular locking dependency in run_unpack_ex","description":"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\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.","publishedAt":"2026-05-06T11:27:16.794Z","updatedAt":"2026-10-21T12:40:09.954Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"57f7979aefdcef66326bda47e07ee0d8be64bf21","status":"affected","lessThan":"d60f09d2d16c44a797d8cb67015cde2508720506","versionType":"git"},{"version":"db7fc56646cafe39599a4c21f1398e2bdfd5c185","status":"affected","lessThan":"76016d15bbd90caa0ce7765fddf9bde8e943e601","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"b014372b62237521444ee51384549bdf48b79015","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"b8d22d9d8260b0f4f4d8e2898c98037c9982ea66","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"08ce2fee1b869ecbfbd94e0eb2630e52203a2e03","versionType":"git"},{"version":"6.6.66","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.12.5","status":"affected","lessThan":"6.12.114","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/run.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/run.c"]}],"references":["https://git.kernel.org/stable/c/d60f09d2d16c44a797d8cb67015cde2508720506","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/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43127.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43127","state":"PUBLISHED","datePublished":"2026-05-06T11:27:16.794Z","dateUpdated":"2026-10-21T12:40:09.954Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.988Z"},"containers":{"cna":{"title":"ntfs3: fix circular locking dependency in run_unpack_ex","descriptions":[{"lang":"en","value":"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\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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"57f7979aefdcef66326bda47e07ee0d8be64bf21","status":"affected","lessThan":"d60f09d2d16c44a797d8cb67015cde2508720506","versionType":"git"},{"version":"db7fc56646cafe39599a4c21f1398e2bdfd5c185","status":"affected","lessThan":"76016d15bbd90caa0ce7765fddf9bde8e943e601","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"b014372b62237521444ee51384549bdf48b79015","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"b8d22d9d8260b0f4f4d8e2898c98037c9982ea66","versionType":"git"},{"version":"5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36","status":"affected","lessThan":"08ce2fee1b869ecbfbd94e0eb2630e52203a2e03","versionType":"git"},{"version":"6.6.66","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.12.5","status":"affected","lessThan":"6.12.114","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/run.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/run.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:40:09.954Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.66","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.5","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}