{"id":"CVE-2026-93268","state":"PUBLISHED","title":"ext4: skip extra isize expansion during mount to prevent deadlock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: skip extra isize expansion during mount to prevent deadlock\n\next4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()\nwhile holding an active jbd2 handle.  During mount (!SB_ACTIVE), the\nexpand path may move xattrs to external blocks and release ea_inodes via\niput().  When !SB_ACTIVE, iput() calls write_inode_now() which acquires\ns_writepages_rwsem, creating a circular lock dependency:\n\n  s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty()\n    -> ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -> ext4_mark_inode_dirty()\n    -> ext4_try_to_expand_extra_isize()\n\nSkip expansion when !SB_ACTIVE.  This is a minor loss of functionality\n(extra isize won't grow for these inodes during mount), which e2fsck\ncan resolve later if needed.","publishedAt":"2026-09-24T15:52:07.310Z","updatedAt":"2026-10-19T09:08:22.372Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"41897f1bcf4ace5f1f28d0be784b6f4f0e929641","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"9c3469377b1d8caba6bec6ef3c460810bbfb02cc","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"1dd4882dbdc8bfdf2182fa388883c143fac0902a","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7ba09330d9ea6e996228316719eae812d7e04983","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"c5e6434cc55f30220b228be237bb666351f9f4dd","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7ace189b9ea79cf78df9c32b940ce12735f9459a","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"2fb8ff81659a57c42bb7b49e8339a2be2a318ef8","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7461c60b9c6a839b13ad4c3490681a0cf5aa0637","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/inode.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/inode.c"]}],"references":["https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641","https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc","https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a","https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983","https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd","https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a","https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8","https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93268.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93268","state":"PUBLISHED","datePublished":"2026-09-24T15:52:07.310Z","dateUpdated":"2026-10-19T09:08:22.372Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.097Z"},"containers":{"cna":{"title":"ext4: skip extra isize expansion during mount to prevent deadlock","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: skip extra isize expansion during mount to prevent deadlock\n\next4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()\nwhile holding an active jbd2 handle.  During mount (!SB_ACTIVE), the\nexpand path may move xattrs to external blocks and release ea_inodes via\niput().  When !SB_ACTIVE, iput() calls write_inode_now() which acquires\ns_writepages_rwsem, creating a circular lock dependency:\n\n  s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty()\n    -> ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -> ext4_mark_inode_dirty()\n    -> ext4_try_to_expand_extra_isize()\n\nSkip expansion when !SB_ACTIVE.  This is a minor loss of functionality\n(extra isize won't grow for these inodes during mount), which e2fsck\ncan resolve later if needed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"41897f1bcf4ace5f1f28d0be784b6f4f0e929641","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"9c3469377b1d8caba6bec6ef3c460810bbfb02cc","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"1dd4882dbdc8bfdf2182fa388883c143fac0902a","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7ba09330d9ea6e996228316719eae812d7e04983","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"c5e6434cc55f30220b228be237bb666351f9f4dd","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7ace189b9ea79cf78df9c32b940ce12735f9459a","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"2fb8ff81659a57c42bb7b49e8339a2be2a318ef8","versionType":"git"},{"version":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f","status":"affected","lessThan":"7461c60b9c6a839b13ad4c3490681a0cf5aa0637","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/inode.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/inode.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641"},{"url":"https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc"},{"url":"https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a"},{"url":"https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983"},{"url":"https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd"},{"url":"https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a"},{"url":"https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8"},{"url":"https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:08:22.372Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}