Out-of-bounds write in Linux kernel - CVE-2026-45990
Published: May 28, 2026
Vulnerability identifier: #VU132499
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45990
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in krealloc() and kvrealloc() fallback paths when shrinking an object while forcing a new alignment or NUMA migration. A local user can trigger a reallocation with crafted size and alignment parameters to cause a denial of service.
The issue can also result in zero-byte copying during NUMA migration in the reallocation path.
How to mitigate CVE-2026-45990
Install security update from vendor's repository.