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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-31598

ocfs2: fix possible deadlock between unlink and dio_end_io_write

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix possible deadlock between unlink and dio_end_io_write ocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem, while in ocfs2_dio_end_io_write, it acquires these locks in reverse order. This creates an ABBA lock ordering violation on lock classes ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and ocfs2_file_ip_alloc_sem_key. Lock Chain #0 (orphan dir inode_lock -> ip_alloc_sem): ocfs2_unlink ocfs2_prepare_orphan_dir ocfs2_lookup_lock_orphan_dir inode_lock(orphan_dir_inode) <- lock A __ocfs2_prepare_orphan_dir ocfs2_prepare_dir_for_insert ocfs2_extend_dir ocfs2_expand_inline_dir down_write(&oi->ip_alloc_sem) <- Lock B Lock Chain #1 (ip_alloc_sem -> orphan dir inode_lock): ocfs2_dio_end_io_write down_write(&oi->ip_alloc_sem) <- Lock B ocfs2_del_inode_from_orphan() inode_lock(orphan_dir_inode) <- Lock A Deadlock Scenario: CPU0 (unlink) CPU1 (dio_end_io_write) ------ ------ inode_lock(orphan_dir_inode) down_write(ip_alloc_sem) down_write(ip_alloc_sem) inode_lock(orphan_dir_inode) Since ip_alloc_sem is to protect allocation changes, which is unrelated with operations in ocfs2_del_inode_from_orphan. So move ocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < 297d8d7bb6a2bf133d3a3636edbdf94101cbd719affected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < 32630dee18c6bb2175c8a865a474749492eaf19caffected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < 93f35419eb84d58820040642cb6e7528fe4aba7aaffected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < 4b80b5a838a32437f2cae0662578bac216a2c51aaffected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < 2b884d52273c60c298bd570163e8053657bbaff6affected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < bc0fb5c7d54c78be43a536df0e20dee32adb27d3affected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < f9fb1a7b635849322e1d7b7b6b26389778ec8e82affected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < e049f7a9bd80b7319590789ea5e1c523d6339d91affected
  • a86a72a4a4e0ec109a98e2737948864ed6794bf7 to < b02da26a992db0c0e2559acbda0fc48d4a2fd337affected

Linux Linux

Default version status: affected

  • 4.6affected
  • 0 to < 4.6unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.136 to ≤ 6.6.*unaffected
  • 6.12.83 to ≤ 6.12.*unaffected
  • 6.18.24 to ≤ 6.18.*unaffected
  • 6.19.14 to ≤ 6.19.*unaffected
  • 7.0.1 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References