{
  "cveId": "CVE-2026-93252",
  "url": "https://patchblox.com/security/cve/CVE-2026-93252",
  "summary": "CVE-2026-93252 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-93252, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ocfs2: fix circular locking dependency in ocfs2_init_acl()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix circular locking dependency in ocfs2_init_acl()  A lockdep warning indicates a circular locking dependency between \u0060\u0026oi-\u003Eip_xattr_sem\u0060 and \u0060\u0026journal-\u003Ej_trans_barrier\u0060:  WARNING: possible circular locking dependency detected is trying to acquire lock:  (\u0026oi-\u003Eip_xattr_sem){\u002B\u002B\u002B\u002B}-{4:4}, at: ocfs2_init_acl\u002B0x2fd/0x7e0  fs/ocfs2/acl.c:367  but task is already holding lock:  (\u0026journal-\u003Ej_trans_barrier){.\u002B.\u002B}-{4:4}, at: ocfs2_start_trans\u002B0x3ab/0x700  fs/ocfs2/journal.c:369  The deadlock involves two code paths: Path 1 (setxattr) where \u0060ocfs2_xattr_set()\u0060 acquires \u0060ip_xattr_sem\u0060 (write) and then starts a transaction, which acquires \u0060j_trans_barrier\u0060 (read); and Path 2 (mkdir/mknod) where \u0060ocfs2_mknod()\u0060 starts a transaction (\u0060j_trans_barrier\u0060 read) and then calls \u0060ocfs2_init_acl()\u0060, which attempts to acquire \u0060ip_xattr_sem\u0060 (read) on the parent directory to retrieve the default ACL.  Because rw_semaphores are subject to writer priority, a pending writer on \u0060j_trans_barrier\u0060 (e.g., the journal commit thread) can cause Path 1 to block, while Path 2 is blocked waiting for Path 1 to release \u0060ip_xattr_sem\u0060.  The patch fixes the lock ordering by precomputing the ACL state before starting the OCFS2 transaction, while preserving POSIX ACL storage semantics and the existing inode/security initialization order. By reading the parent directory\u0027s default ACL and preparing the new inode\u0027s ACLs outside the transaction, \u0060ip_xattr_sem\u0060 is always acquired before \u0060j_trans_barrier\u0060.  \u0060struct ocfs2_acl_state\u0060 encapsulates the prepared ACL state, while \u0060ocfs2_acl_init_prepare()\u0060 and \u0060ocfs2_acl_init_release()\u0060 avoid code duplication between \u0060ocfs2_mknod()\u0060 and \u0060ocfs2_init_security_and_acl()\u0060. \u0060ocfs2_calc_xattr_init()\u0060 and \u0060ocfs2_init_acl()\u0060 use this precomputed state, removing internal \u0060ip_xattr_sem\u0060 acquisition and redundant disk reads.  Additionally, remove the \u0060ip_xattr_sem\u0060 acquisition from \u0060ocfs2_xattr_set_handle()\u0060. This function is only used while initializing a new inode that has not yet been inserted into the inode hash or attached to a dentry, meaning there is no risk of concurrent access and the lock is unnecessary.",
  "published": "2026-09-24T16:17:21Z",
  "severity": "Moderate",
  "cvss": 4.7,
  "epss": 0.00216,
  "epssPercentile": 0.12167,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93252",
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    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}