Out-of-bounds read in Linux kernel - CVE-2026-68453
Published: August 14, 2026
Vulnerability identifier: #VU142480
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68453
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service or disclose sensitive information.
The vulnerability exists due to out-of-bounds read in the s390 zcrypt CCA token validation and handling logic when processing crafted CCA key token buffers with user-controlled length fields. A local user can provide a specially crafted key token with inconsistent length values to cause a denial of service or disclose sensitive information.
The issue involves both oversized length fields that exceed the actual buffer size and undersized length fields that can cause a buffer under-run with similar effects.
Affected software
Linux kernel
How to mitigate CVE-2026-68453
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3