CVE-2026-93252 (GCVE-0-2026-93252)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:51 – Updated: 2026-09-24 15:51
VLAI
Title
ocfs2: fix circular locking dependency in ocfs2_init_acl()
Summary
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 `&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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < 4936d4464d1ae10b5fbba64374085a0dcc060560 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < caf3056936fb8b5ce92e419cf8b246ce9c437343 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < 5b7b3c50c39ad0dc27e7418981e01c4183273f89 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < 8d88f52fbbbcc18adf4091a955511d0cf605bf11 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < 8931403ee3dcfe8a24a5267efec9d9460ab7a1b5 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < f8747d81aa6d3efe3ee339a9d912ff3ca6e4d758 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < 1222f7a3183b35c0c566899fdaead5c7c4043076 (git)
Affected: 16c8d569f5704a84164f30ff01b29879f3438065 , < bd7c05fb4a4776dff5a87b19008d28458647d15d (git)
Affected: 15ac59a84750b3afc0a2b6f2636c4f7e6cbd6d5e (git)
Affected: b35bb8a41795caa05e09c3aacf7d78f1f20bac04 (git)
Affected: 1d5fdc1307eeb04b334c5dc23e11dbd6068d90eb (git)
Affected: a66174eb4a149b7919d174d9a7ce6ad9909c5ee2 (git)
Affected: 3.18.111 , < 3.19 (semver)
Affected: 4.4.134 , < 4.5 (semver)
Affected: 4.9.104 , < 4.10 (semver)
Affected: 4.14.37 , < 4.15 (semver)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix circular locking dependency in ocfs2_init_acl()\n\nA lockdep warning indicates a circular locking dependency between\n`\u0026oi-\u003eip_xattr_sem` and `\u0026journal-\u003ej_trans_barrier`:\n\nWARNING: possible circular locking dependency detected\nis trying to acquire lock:\n (\u0026oi-\u003eip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0\n fs/ocfs2/acl.c:367\n\nbut task is already holding lock:\n (\u0026journal-\u003ej_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700\n fs/ocfs2/journal.c:369\n\nThe deadlock involves two code paths: Path 1 (setxattr) where\n`ocfs2_xattr_set()` acquires `ip_xattr_sem` (write) and then starts a\ntransaction, which acquires `j_trans_barrier` (read); and Path 2\n(mkdir/mknod) where `ocfs2_mknod()` starts a transaction (`j_trans_barrier`\nread) and then calls `ocfs2_init_acl()`, which attempts to acquire\n`ip_xattr_sem` (read) on the parent directory to retrieve the default ACL.\n\nBecause rw_semaphores are subject to writer priority, a pending writer on\n`j_trans_barrier` (e.g., the journal commit thread) can cause Path 1 to\nblock, while Path 2 is blocked waiting for Path 1 to release\n`ip_xattr_sem`.\n\nThe patch fixes the lock ordering by precomputing the ACL state before\nstarting the OCFS2 transaction, while preserving POSIX ACL storage\nsemantics and the existing inode/security initialization order. By reading\nthe parent directory\u0027s default ACL and preparing the new inode\u0027s ACLs\noutside the transaction, `ip_xattr_sem` is always acquired before\n`j_trans_barrier`.\n\n`struct ocfs2_acl_state` encapsulates the prepared ACL state, while\n`ocfs2_acl_init_prepare()` and `ocfs2_acl_init_release()` avoid code\nduplication between `ocfs2_mknod()` and `ocfs2_init_security_and_acl()`.\n`ocfs2_calc_xattr_init()` and `ocfs2_init_acl()` use this precomputed\nstate, removing internal `ip_xattr_sem` acquisition and redundant disk\nreads.\n\nAdditionally, remove the `ip_xattr_sem` acquisition from\n`ocfs2_xattr_set_handle()`. This function is only used while initializing a\nnew inode that has not yet been inserted into the inode hash or attached to\na dentry, meaning there is no risk of concurrent access and the lock is\nunnecessary."
        }
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        "dateUpdated": "2026-09-24T15:51:28.355Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4936d4464d1ae10b5fbba64374085a0dcc060560"
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        {
          "url": "https://git.kernel.org/stable/c/caf3056936fb8b5ce92e419cf8b246ce9c437343"
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          "url": "https://git.kernel.org/stable/c/8d88f52fbbbcc18adf4091a955511d0cf605bf11"
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          "url": "https://git.kernel.org/stable/c/1222f7a3183b35c0c566899fdaead5c7c4043076"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd7c05fb4a4776dff5a87b19008d28458647d15d"
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      ],
      "title": "ocfs2: fix circular locking dependency in ocfs2_init_acl()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93252",
    "datePublished": "2026-09-24T15:51:28.355Z",
    "dateReserved": "2026-09-17T16:02:15.096Z",
    "dateUpdated": "2026-09-24T15:51:28.355Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix circular locking dependency in ocfs2_init_acl()\n\nA lockdep warning indicates a circular locking dependency between\n`\u0026oi-\u003eip_xattr_sem` and `\u0026journal-\u003ej_trans_barrier`:\n\nWARNING: possible circular locking dependency detected\nis trying to acquire lock:\n (\u0026oi-\u003eip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0\n fs/ocfs2/acl.c:367\n\nbut task is already holding lock:\n (\u0026journal-\u003ej_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700\n fs/ocfs2/journal.c:369\n\nThe deadlock involves two code paths: Path 1 (setxattr) where\n`ocfs2_xattr_set()` acquires `ip_xattr_sem` (write) and then starts a\ntransaction, which acquires `j_trans_barrier` (read); and Path 2\n(mkdir/mknod) where `ocfs2_mknod()` starts a transaction (`j_trans_barrier`\nread) and then calls `ocfs2_init_acl()`, which attempts to acquire\n`ip_xattr_sem` (read) on the parent directory to retrieve the default ACL.\n\nBecause rw_semaphores are subject to writer priority, a pending writer on\n`j_trans_barrier` (e.g., the journal commit thread) can cause Path 1 to\nblock, while Path 2 is blocked waiting for Path 1 to release\n`ip_xattr_sem`.\n\nThe patch fixes the lock ordering by precomputing the ACL state before\nstarting the OCFS2 transaction, while preserving POSIX ACL storage\nsemantics and the existing inode/security initialization order. By reading\nthe parent directory\u0027s default ACL and preparing the new inode\u0027s ACLs\noutside the transaction, `ip_xattr_sem` is always acquired before\n`j_trans_barrier`.\n\n`struct ocfs2_acl_state` encapsulates the prepared ACL state, while\n`ocfs2_acl_init_prepare()` and `ocfs2_acl_init_release()` avoid code\nduplication between `ocfs2_mknod()` and `ocfs2_init_security_and_acl()`.\n`ocfs2_calc_xattr_init()` and `ocfs2_init_acl()` use this precomputed\nstate, removing internal `ip_xattr_sem` acquisition and redundant disk\nreads.\n\nAdditionally, remove the `ip_xattr_sem` acquisition from\n`ocfs2_xattr_set_handle()`. This function is only used while initializing a\nnew inode that has not yet been inserted into the inode hash or attached to\na dentry, meaning there is no risk of concurrent access and the lock is\nunnecessary."
          }
        ],
        "id": "CVE-2026-93252",
        "lastModified": "2026-09-24T16:17:21.463",
        "metrics": {},
        "published": "2026-09-24T16:17:21.463",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1222f7a3183b35c0c566899fdaead5c7c4043076"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4936d4464d1ae10b5fbba64374085a0dcc060560"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5b7b3c50c39ad0dc27e7418981e01c4183273f89"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8931403ee3dcfe8a24a5267efec9d9460ab7a1b5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8d88f52fbbbcc18adf4091a955511d0cf605bf11"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bd7c05fb4a4776dff5a87b19008d28458647d15d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/caf3056936fb8b5ce92e419cf8b246ce9c437343"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f8747d81aa6d3efe3ee339a9d912ff3ca6e4d758"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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