CVE-2026-68096 (GCVE-0-2026-68096)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-23 12:45
VLAI
Title
audit: fix recursive locking deadlock in audit_dupe_exe()
Summary
In the Linux kernel, the following vulnerability has been resolved: audit: fix recursive locking deadlock in audit_dupe_exe() A deadlock occurs in the audit subsystem when duplicating executable-related rules. When a file is moved (e.g., via do_renameat2()), the VFS layer locks the parent directory (I_MUTEX_PARENT), which synchronously triggers an fsnotify_move event. If an existing executable audit rule matches the file being moved, the audit subsystem catches this event and calls audit_dupe_exe() to duplicate the watch and update the rule. Then, audit_alloc_mark() would call kern_path_parent() to resolve the path, leading to a blind attempt to acquire the exact same I_MUTEX_PARENT lock already held by the task, resulting in the following recursive locking deadlock: ============================================ WARNING: possible recursive locking detected 6.12.0-55.27.1.el10_0.x86_64+debug #1 Not tainted -------------------------------------------- mv/5099 is trying to acquire lock: ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3}, at: __kern_path_locked+0x10a/0x2f0 but task is already holding lock: ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3}, at: lock_two_directories+0x13f/0x2b0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&inode->i_sb->s_type->i_mutex_dir_key/1); lock(&inode->i_sb->s_type->i_mutex_dir_key/1); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by mv/5099: #0: ffff888112a9c440 (sb_writers#13) at: do_renameat2+0x34c/0xbc0 #1: ffff888112a9c790 (&type->s_vfs_rename_key#3) at: do_renameat2+0x415/0xbc0 #2: ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1) at: lock_two_directories+0x13f/0x2b0 #3: ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/5) at: lock_two_directories+0x175/0x2b0 #4: ffffffffb3a1fb10 (&fsnotify_mark_srcu) at: fsnotify+0x454/0x28a0 #5: ffffffffaf886230 (audit_filter_mutex) at: audit_update_watch+0x36/0x11e0 stack backtrace: Call Trace: <TASK> dump_stack_lvl+0x6f/0xb0 print_deadlock_bug.cold+0xbd/0xca validate_chain+0x83a/0xf00 __lock_acquire+0xcac/0x1d20 lock_acquire.part.0+0x11b/0x360 down_write_nested+0x9f/0x230 __kern_path_locked+0x10a/0x2f0 kern_path_locked+0x26/0x40 audit_alloc_mark+0xfb/0x4f0 audit_dupe_exe+0x6c/0xe0 audit_dupe_rule+0x6c2/0xc00 audit_update_watch+0x4cc/0x11e0 audit_watch_handle_event+0x12c/0x1b0 send_to_group+0x5d0/0x8b0 fsnotify+0x615/0x28a0 fsnotify_move+0x1d8/0x630 vfs_rename+0xdcd/0x1df0 do_renameat2+0x9d4/0xbc0 __x64_sys_renameat+0x192/0x260 do_syscall_64+0x92/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f0491fe8c4e Code: 0f 1f 40 00 48 8b 15 c1 e1 16 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 08 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 89 RSP: 002b:00007ffc7210bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0491fe8c4e RDX: 0000000000000003 RSI: 00007ffc7210e6c8 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 00005575eb2dae2a R11: 0000000000000246 R12: 00005575eb2dae2a R13: 00007ffc7210e6c8 R14: 0000000000000003 R15: 00000000ffffff9c </TASK> The aforementioned deadlock can be consistently reproduced by running the script below: audit-dupe-exe-deadlock.sh -------------------------- #!/bin/bash auditctl -D mkdir -p /tmp/foo touch /tmp/file auditctl -a always,exit -F exe=/tmp/file -F path=/tmp/file -S all -k dr mv /tmp/file /tmp/foo/file rm -Rf /tmp/foo This patch fixes the issue by introducing struct audit_watch_ctx to pass the fsnotify event context down to audit_alloc_mark(). By utilizing the already-resolved directory inode provided by the event, we bypass the kern_path_parent() path resol ---truncated---
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 6114c3f21eb2ae175401736da744b684705e7ed9 (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < f6fda0ac6661c23b8356dfb1cc423960cc6f0593 (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 3bbb4931f7cd84cecf29ec222c0732bf9ad4da9f (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 36eb77f14b4e6f2dc1008c1fabe31236397be27a (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 7d1f66c69898ffb1a718926c32a777ecc471caca (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 40879c39d6740f3dddfb52b5d6ba7fb8cceb84d8 (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 3b601938314c24fcd1afb6659cad92fe96c9c2f8 (git)
Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 81905b5acbe77284734438df3fbec1158e6429a3 (git)
Create a notification for this product.
Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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              "status": "unaffected",
              "version": "5.15.217",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: fix recursive locking deadlock in audit_dupe_exe()\n\nA deadlock occurs in the audit subsystem when duplicating\nexecutable-related rules.\n\nWhen a file is moved (e.g., via do_renameat2()), the VFS layer locks\nthe parent directory (I_MUTEX_PARENT), which synchronously triggers an\nfsnotify_move event. If an existing executable audit rule matches the\nfile being moved, the audit subsystem catches this event and calls\naudit_dupe_exe() to duplicate the watch and update the rule. Then,\naudit_alloc_mark() would call kern_path_parent() to resolve the path,\nleading to a blind attempt to acquire the exact same I_MUTEX_PARENT lock\nalready held by the task, resulting in the following recursive locking\ndeadlock:\n\n ============================================\n WARNING: possible recursive locking detected\n 6.12.0-55.27.1.el10_0.x86_64+debug #1 Not tainted\n --------------------------------------------\n mv/5099 is trying to acquire lock:\n ffff888132845358 (\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/1){+.+.}-{3:3},\n at: __kern_path_locked+0x10a/0x2f0\n\n but task is already holding lock:\n ffff888132846b58 (\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/1){+.+.}-{3:3},\n at: lock_two_directories+0x13f/0x2b0\n\n other info that might help us debug this:\n  Possible unsafe locking scenario:\n\n        CPU0\n        ----\n   lock(\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/1);\n   lock(\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/1);\n\n  *** DEADLOCK ***\n\n  May be due to missing lock nesting notation\n\n  6 locks held by mv/5099:\n  #0: ffff888112a9c440 (sb_writers#13)\n  at: do_renameat2+0x34c/0xbc0\n  #1: ffff888112a9c790 (\u0026type-\u003es_vfs_rename_key#3)\n  at: do_renameat2+0x415/0xbc0\n  #2: ffff888132846b58 (\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/1)\n  at: lock_two_directories+0x13f/0x2b0\n  #3: ffff888132845358 (\u0026inode-\u003ei_sb-\u003es_type-\u003ei_mutex_dir_key/5)\n  at: lock_two_directories+0x175/0x2b0\n  #4: ffffffffb3a1fb10 (\u0026fsnotify_mark_srcu)\n  at: fsnotify+0x454/0x28a0\n  #5: ffffffffaf886230 (audit_filter_mutex)\n  at: audit_update_watch+0x36/0x11e0\n\n stack backtrace:\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x6f/0xb0\n  print_deadlock_bug.cold+0xbd/0xca\n  validate_chain+0x83a/0xf00\n  __lock_acquire+0xcac/0x1d20\n  lock_acquire.part.0+0x11b/0x360\n  down_write_nested+0x9f/0x230\n  __kern_path_locked+0x10a/0x2f0\n  kern_path_locked+0x26/0x40\n  audit_alloc_mark+0xfb/0x4f0\n  audit_dupe_exe+0x6c/0xe0\n  audit_dupe_rule+0x6c2/0xc00\n  audit_update_watch+0x4cc/0x11e0\n  audit_watch_handle_event+0x12c/0x1b0\n  send_to_group+0x5d0/0x8b0\n  fsnotify+0x615/0x28a0\n  fsnotify_move+0x1d8/0x630\n  vfs_rename+0xdcd/0x1df0\n  do_renameat2+0x9d4/0xbc0\n  __x64_sys_renameat+0x192/0x260\n  do_syscall_64+0x92/0x180\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f0491fe8c4e\n Code: 0f 1f 40 00 48 8b 15 c1 e1 16 00 f7 d8 64 89 02 b8 ff ff ff ff\n c3 66 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 08 01 00 00 0f 05 \u003c48\u003e\n 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 89\n RSP: 002b:00007ffc7210bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\n RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0491fe8c4e\n RDX: 0000000000000003 RSI: 00007ffc7210e6c8 RDI: 00000000ffffff9c\n RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001\n R10: 00005575eb2dae2a R11: 0000000000000246 R12: 00005575eb2dae2a\n R13: 00007ffc7210e6c8 R14: 0000000000000003 R15: 00000000ffffff9c\n  \u003c/TASK\u003e\n\nThe aforementioned deadlock can be consistently reproduced by running\nthe script below:\n\n audit-dupe-exe-deadlock.sh\n --------------------------\n #!/bin/bash\n auditctl -D\n mkdir -p /tmp/foo\n touch /tmp/file\n auditctl -a always,exit -F exe=/tmp/file -F path=/tmp/file -S all -k dr\n mv /tmp/file /tmp/foo/file\n rm -Rf /tmp/foo\n\nThis patch fixes the issue by introducing struct audit_watch_ctx to pass\nthe fsnotify event context down to audit_alloc_mark(). By utilizing the\nalready-resolved directory inode provided by the event, we bypass the\nkern_path_parent() path resol\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The deadlock is triggered when vfs_rename() emits fsnotify_move() during rename processing; on NFS (nfsd) and SMB (ksmbd) servers a remote client rename request reaches this same synchronous audit_update_watch()-\u003eaudit_dupe_exe()-\u003eaudit_alloc_mark()-\u003ekern_path_parent() path, not only local renameat().\nAC:L - Once an audit rule combining exe= and path= watches exists, the fix commit shows the recursive directory-lock deadlock is consistently reproduced by a simple rename/move; the attacker controls when the rename occurs and no race or special memory layout is required.\nPR:N - Triggering requires only the ability to rename the watched file on a local or network-exported path; a remote NFS/SMB client can issue that rename without local shell access, CAP_AUDIT_CONTROL, or other elevated server-side Unix privileges beyond export write access.\nUI:N - No victim interaction is required; the attacker or any client performing the rename directly invokes the vulnerable fsnotify/audit path without needing another user to open files, click links, or mount filesystems.\nS:U - Impact is confined to the vulnerable kernel host where the rename is processed (task hang/deadlock during audit rule update); it does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - This is a recursive mutex deadlock with no memory corruption, out-of-bounds access, or use-after-free; no attacker-controlled information disclosure occurs beyond optional lockdep diagnostics on debug kernels.\nI:N - The bug does not modify kernel or user data and provides no write primitive or code-execution path; it only deadlocks the calling context while holding VFS directory locks and audit_filter_mutex.\nA:H - The vulnerability causes a deterministic recursive locking deadlock that permanently hangs the rename task while holding directory inode locks and audit_filter_mutex, denying that operation and potentially blocking audit processing and directory operations system-wide."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:47.969Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6114c3f21eb2ae175401736da744b684705e7ed9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6fda0ac6661c23b8356dfb1cc423960cc6f0593"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bbb4931f7cd84cecf29ec222c0732bf9ad4da9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/36eb77f14b4e6f2dc1008c1fabe31236397be27a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d1f66c69898ffb1a718926c32a777ecc471caca"
        },
        {
          "url": "https://git.kernel.org/stable/c/40879c39d6740f3dddfb52b5d6ba7fb8cceb84d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b601938314c24fcd1afb6659cad92fe96c9c2f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/81905b5acbe77284734438df3fbec1158e6429a3"
        }
      ],
      "title": "audit: fix recursive locking deadlock in audit_dupe_exe()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68096",
    "datePublished": "2026-08-10T11:58:09.951Z",
    "dateReserved": "2026-07-30T09:28:09.368Z",
    "dateUpdated": "2026-08-23T12:45:47.969Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68096",
      "date": "2026-10-03",
      "epss": "0.00533",
      "percentile": "0.43035"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-03T00:40:20Z",
      "cve": "CVE-2026-68096",
      "id": "CVE-2026-68096",
      "initial_release_date": "2026-08-11T23:48:32Z",
      "product_status:known_affected": "279",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "145",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68096",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68096.json",
      "version": "6"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.