CVE-2026-31598High· 7.5▾ TwilightIn 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,…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
Last analysed / modified upstream
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.
Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < 297d8d7bb6a2bf133d3a3636edbdf94101cbd719Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < 32630dee18c6bb2175c8a865a474749492eaf19cLinux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < 93f35419eb84d58820040642cb6e7528fe4aba7aLinux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < 4b80b5a838a32437f2cae0662578bac216a2c51aLinux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < 2b884d52273c60c298bd570163e8053657bbaff6Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < bc0fb5c7d54c78be43a536df0e20dee32adb27d3Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < f9fb1a7b635849322e1d7b7b6b26389778ec8e82Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < e049f7a9bd80b7319590789ea5e1c523d6339d91Linux >= a86a72a4a4e0ec109a98e2737948864ed6794bf7 < b02da26a992db0c0e2559acbda0fc48d4a2fd337Linux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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