{"id":"CVE-2026-93268","title":"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 jbd…","summary":"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 jbd…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 41897f1bcf4ace5f1f28d0be784b6f4f0e929641","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 9c3469377b1d8caba6bec6ef3c460810bbfb02cc","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 1dd4882dbdc8bfdf2182fa388883c143fac0902a","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 7ba09330d9ea6e996228316719eae812d7e04983","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < c5e6434cc55f30220b228be237bb666351f9f4dd","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 7ace189b9ea79cf78df9c32b940ce12735f9459a","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 2fb8ff81659a57c42bb7b49e8339a2be2a318ef8","Linux >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f < 7461c60b9c6a839b13ad4c3490681a0cf5aa0637","Linux 4.7"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:23.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93268","references":[{"url":"https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93268.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93268"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540316"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93268"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93268"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93268.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-24T16:47:15.838Z","epss":0.00201,"epssPercentile":0.09968,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-833"],"slug":"CVE-2026-93268","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93268.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224229,"id":"CVE-2026-93268","ts":1792325025074,"field":"cvss","old":null,"new":"5.5"},{"seq":224228,"id":"CVE-2026-93268","ts":1792325025074,"field":"severity","old":"none","new":"medium"}]}