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7.5
HIGH CVSS 3.1
CVE-2026-31598
ocfs2: fix possible deadlock between unlink and dio_end_io_write
Overview
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.

Details
INFO

Published Date :

April 24, 2026, 3:16 p.m.

Last Modified :

June 1, 2026, 5:16 p.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-31598 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Fix a deadlock in ocfs2 by correcting lock ordering in unlink and dio_end_io_write operations.
  • Update the Linux kernel to include the fix.
  • Review locking mechanisms for potential race conditions.
  • Ensure consistent lock acquisition order.
  • Test the changes thoroughly.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-31598.

URL Resource
https://git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719
https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6 Patch
https://git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c
https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a Patch
https://git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a
https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337 Patch
https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3 Patch
https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91 Patch
https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-31598 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-31598 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-31598 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-31598 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 01, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719
    Added Reference https://git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c
    Added Reference https://git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a
  • Initial Analysis by [email protected]

    Apr. 29, 2026

    Action Type Old Value New Value
    Added CWE CWE-667
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.24 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 7.0 up to (excluding) 7.0.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.83 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.6 up to (excluding) 6.6.136
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82 Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Apr. 27, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Apr. 27, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Apr. 27, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Apr. 24, 2026

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6
    Added Reference https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3
    Added Reference https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91
    Added Reference https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact