Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-80821
Published: September 5, 2026
Vulnerability identifier: #VU147103
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80821
CWE-ID: CWE-772
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource release in nvmet_pci_epf_create_cq() when processing Create IO completion queue commands with a failing PRP1 or pci_addr mapping. A remote attacker can issue crafted Create IO CQ commands to cause a denial of service.
A too-small partial PCI address-space mapping can also trigger the issue.
Affected software
Linux kernel
How to mitigate CVE-2026-80821
Install security update from vendor's repository.