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CVE-2026-31598

ocfs2: fix possible deadlock between unlink and dio_end_io_write

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.83, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in 297d8d7bb6a2bf133d3a3636edbdf94101cbd719; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in 32630dee18c6bb2175c8a865a474749492eaf19c; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in 93f35419eb84d58820040642cb6e7528fe4aba7a; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in 4b80b5a838a32437f2cae0662578bac216a2c51a; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in 2b884d52273c60c298bd570163e8053657bbaff6; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in bc0fb5c7d54c78be43a536df0e20dee32adb27d3; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in f9fb1a7b635849322e1d7b7b6b26389778ec8e82; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in e049f7a9bd80b7319590789ea5e1c523d6339d91; From a86a72a4a4e0ec109a98e2737948864ed6794bf7 · fixed in b02da26a992db0c0e2559acbda0fc48d4a2fd337

  • Linux Linux

    4.6

  • KernelLinux

    From 4.6.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.83; From 6.13.0 · fixed in 6.18.24; From 6.19.0 · fixed in 6.19.14; From 6.20.0 · fixed in 7.0.1

References 9

git.kernel.org