Out-of-bounds write in Linux kernel - CVE-2026-45990

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Main Vulnerability Database Vulnerabilities #VU132499

Out-of-bounds write in Linux kernel - CVE-2026-45990

Published: May 28, 2026


Vulnerability identifier: #VU132499
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-45990
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-45990

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins