CVE-2026-74351

Kernel memory disclosure via stale LVB pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel OCFS2 allows local privileged users to disclose memory or crash the kernel by racing a debugfs read. The locking_state iterator copies an ocfs2_lock_res but leaves sb_lvbptr referencing the original owner, which teardown can free before ocfs2_dlm_seq_show reads the LVB. Exploitation requires privileged debugfs access, an OCFS2 userspace fsdlm lock, and a concurrent lock-resource teardown.

CVSS severity6.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in Linux kernel OCFS2 allows local privileged users to disclose memory or crash the kernel by racing a debugfs read. The locking_state iterator copies an ocfs2_lock_res but leaves sb_lvbptr referencing the original owner, which teardown can free before ocfs2_dlm_seq_show reads the LVB. Exploitation requires privileged debugfs access, an OCFS2 userspace fsdlm lock, and a concurrent lock-resource teardown.

The record

CVE
CVE-2026-74351
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.26
  2. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <07aa4a8ebacde3d0ba50f60d2964f274ee7629bc
  3. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <185427b5f7a209254c85c18aad5a4a8e009b2f30
  4. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <610a0d2a35496738e1472fb0f318d5008a1c634f
  5. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411
  6. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <8614a8f7e81edd34c9f67e454e7024fd12a2a341
  7. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <93612d48fa42b3d1a637eb9279e15281c611c000
  8. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <bb44a7690a4d553da705919cf666a80f5ca9011c
  9. Affected versionversion=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <e037c1250cc90e7aacb002357d1b0399fc65ecfc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <07aa4a8ebacde3d0ba50f60d2964f274ee7629bc; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <185427b5f7a209254c85c18aad5a4a8e009b2f30; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <610a0d2a35496738e1472fb0f318d5008a1c634f; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <8614a8f7e81edd34c9f67e454e7024fd12a2a341; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <93612d48fa42b3d1a637eb9279e15281c611c000; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <bb44a7690a4d553da705919cf666a80f5ca9011c; version=cf4d8d75d8aba537a19b313a9364fd08ddbd5622 <e037c1250cc90e7aacb002357d1b0399fc65ecfc

Published CVSS scores

1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
5.1SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo