ocfs2: fix possible deadlock between unlink and dio_end_io_write

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Summary

CVECVE-2026-31598
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:37 UTC
Updated2026-06-01 17:16:50 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-667

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 297d8d7bb6a2bf133d3a3636edbdf94101cbd719 git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 32630dee18c6bb2175c8a865a474749492eaf19c git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 93f35419eb84d58820040642cb6e7528fe4aba7a git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 4b80b5a838a32437f2cae0662578bac216a2c51a git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 2b884d52273c60c298bd570163e8053657bbaff6 git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 bc0fb5c7d54c78be43a536df0e20dee32adb27d3 git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 f9fb1a7b635849322e1d7b7b6b26389778ec8e82 git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 e049f7a9bd80b7319590789ea5e1c523d6339d91 git Not specified
CNA Linux Linux affected a86a72a4a4e0ec109a98e2737948864ed6794bf7 b02da26a992db0c0e2559acbda0fc48d4a2fd337 git Not specified
CNA Linux Linux affected 4.6 Not specified
CNA Linux Linux unaffected 4.6 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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