Resource exhaustion in Linux kernel - CVE-2026-80720
Published: August 28, 2026
Vulnerability identifier: #VU146065
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-2026-80720
CWE-ID: CWE-400
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 improper resource management in iomap_split_ioend in fs/iomap/ioend.c when splitting bios that already come from iomap_ioend_bioset. A local user can trigger bio splitting in this context to cause a denial of service.
The issue can deadlock when the bioset is exhausted.
Affected software
Linux kernel
How to mitigate CVE-2026-80720
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3