Out-of-bounds read in Linux kernel - CVE-2026-90322

Vulnerability identifier: #VU151157

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90322

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to read out-of-bounds memory.

The vulnerability exists due to an invalid node number being used as a heartbeat slot index in the OCFS2 heartbeat subsystem when resetting the local node configuration while heartbeat threads are running. A local user can reset the local node configuration while heartbeat threads are running to read out-of-bounds memory.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/688bc88e2046dd6ce81ce18079b5254cb8dadc0e
• https://git.kernel.org/stable/c/70d7bb7a0be033e5ebe8a2c48974692b1318891c
• https://git.kernel.org/stable/c/8abb2b7c60d2b2c0f40606048c873096c03874d2
• https://git.kernel.org/stable/c/8e5cb90f212fda9f6cd29915a1ed74353108ceb3

• Out-of-bounds read in Linux kernel ocfs2 cluster
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more