ocfs2: fix circular locking dependency in ocfs2_init_acl()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93252
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:21 UTC
Updated2026-09-24 16:17:21 UTC
DescriptionIn 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 `&oi->ip_xattr_sem` and `&journal->j_trans_barrier`: WARNING: possible circular locking dependency detected is trying to acquire lock: (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0 fs/ocfs2/acl.c:367 but task is already holding lock: (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700 fs/ocfs2/journal.c:369 The deadlock involves two code paths: Path 1 (setxattr) where `ocfs2_xattr_set()` acquires `ip_xattr_sem` (write) and then starts a transaction, which acquires `j_trans_barrier` (read); and Path 2 (mkdir/mknod) where `ocfs2_mknod()` starts a transaction (`j_trans_barrier` read) and then calls `ocfs2_init_acl()`, which attempts to acquire `ip_xattr_sem` (read) on the parent directory to retrieve the default ACL. Because rw_semaphores are subject to writer priority, a pending writer on `j_trans_barrier` (e.g., the journal commit thread) can cause Path 1 to block, while Path 2 is blocked waiting for Path 1 to release `ip_xattr_sem`. 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's default ACL and preparing the new inode's ACLs outside the transaction, `ip_xattr_sem` is always acquired before `j_trans_barrier`. `struct ocfs2_acl_state` encapsulates the prepared ACL state, while `ocfs2_acl_init_prepare()` and `ocfs2_acl_init_release()` avoid code duplication between `ocfs2_mknod()` and `ocfs2_init_security_and_acl()`. `ocfs2_calc_xattr_init()` and `ocfs2_init_acl()` use this precomputed state, removing internal `ip_xattr_sem` acquisition and redundant disk reads. Additionally, remove the `ip_xattr_sem` acquisition from `ocfs2_xattr_set_handle()`. 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 4936d4464d1ae10b5fbba64374085a0dcc060560 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 caf3056936fb8b5ce92e419cf8b246ce9c437343 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 5b7b3c50c39ad0dc27e7418981e01c4183273f89 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 8d88f52fbbbcc18adf4091a955511d0cf605bf11 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 8931403ee3dcfe8a24a5267efec9d9460ab7a1b5 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 f8747d81aa6d3efe3ee339a9d912ff3ca6e4d758 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 1222f7a3183b35c0c566899fdaead5c7c4043076 git Not specified
CNA Linux Linux affected 16c8d569f5704a84164f30ff01b29879f3438065 bd7c05fb4a4776dff5a87b19008d28458647d15d git Not specified
CNA Linux Linux affected 15ac59a84750b3afc0a2b6f2636c4f7e6cbd6d5e git Not specified
CNA Linux Linux affected b35bb8a41795caa05e09c3aacf7d78f1f20bac04 git Not specified
CNA Linux Linux affected 1d5fdc1307eeb04b334c5dc23e11dbd6068d90eb git Not specified
CNA Linux Linux affected a66174eb4a149b7919d174d9a7ce6ad9909c5ee2 git Not specified
CNA Linux Linux affected 3.18.111 3.19 semver Not specified
CNA Linux Linux affected 4.4.134 4.5 semver Not specified
CNA Linux Linux affected 4.9.104 4.10 semver Not specified
CNA Linux Linux affected 4.14.37 4.15 semver Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8931403ee3dcfe8a24a5267efec9d9460ab7a1b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b7b3c50c39ad0dc27e7418981e01c4183273f89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d88f52fbbbcc18adf4091a955511d0cf605bf11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/caf3056936fb8b5ce92e419cf8b246ce9c437343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd7c05fb4a4776dff5a87b19008d28458647d15d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1222f7a3183b35c0c566899fdaead5c7c4043076 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8747d81aa6d3efe3ee339a9d912ff3ca6e4d758 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4936d4464d1ae10b5fbba64374085a0dcc060560 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report