Double free in Linux kernel - CVE-2026-53067
Published: June 25, 2026
Vulnerability identifier: #VU135276
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-2026-53067
CWE-ID: CWE-415
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 double free in pci_epf_alloc_doorbell() in the pci endpoint MSI component when handling doorbell allocation after MSI allocation failure or repeated allocation attempts. A local user can trigger doorbell allocation in a way that leaves stale state or reuses an existing allocation to cause a denial of service.
How to mitigate CVE-2026-53067
Install security update from vendor's repository.