Out-of-bounds write in Linux kernel - CVE-2026-68478

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Main Vulnerability Database Vulnerabilities #VU143599

Out-of-bounds write in Linux kernel - CVE-2026-68478

Published: August 16, 2026


Vulnerability identifier: #VU143599
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68478
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows an attacker with physical access to corrupt memory.

The vulnerability exists due to an out-of-bounds write in the ms_block Memory Stick block translation layer when processing a Memory Stick card that reports an excessive number of blocks. An attacker with physical access can provide a crafted card with a block count above the supported maximum to corrupt memory.

The issue occurs because the card-supplied block count can cause indexing past the end of the fixed free_block_count array.


Affected software

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-68478

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins