{"id":"CVE-2026-93268","summary":"ext4: skip extra isize expansion during mount to prevent deadlock","details":"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 --\u003e jbd2_handle --\u003e xattr_sem --\u003e s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -\u003e ext4_truncate() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -\u003e ext4_mark_inode_dirty()\n    -\u003e 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.","modified":"2026-09-26T03:48:31.294252759Z","published":"2026-09-24T15:52:07.310Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93268.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93268.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93268"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c8585c6fcaf2011de54c3592e80a634a2b9e1a7f"},{"fixed":"41897f1bcf4ace5f1f28d0be784b6f4f0e929641"},{"fixed":"9c3469377b1d8caba6bec6ef3c460810bbfb02cc"},{"fixed":"1dd4882dbdc8bfdf2182fa388883c143fac0902a"},{"fixed":"7ba09330d9ea6e996228316719eae812d7e04983"},{"fixed":"c5e6434cc55f30220b228be237bb666351f9f4dd"},{"fixed":"7ace189b9ea79cf78df9c32b940ce12735f9459a"},{"fixed":"2fb8ff81659a57c42bb7b49e8339a2be2a318ef8"},{"fixed":"7461c60b9c6a839b13ad4c3490681a0cf5aa0637"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93268.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.7.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93268.json"}}],"schema_version":"1.9.0"}