Use-after-free in Linux kernel - CVE-2026-92521
Published: September 18, 2026
Vulnerability identifier: #VU150989
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-92521
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger use of freed memory.
The vulnerability exists due to a use-after-free in ACPI PCI root handling when processing hot-add failures or root bridge removal. A local user can invoke a later acpi_pci_find_root() lookup to trigger use of freed memory.
The freed root object remains referenced by device->driver_data.
Affected software
Linux kernel
How to mitigate CVE-2026-92521
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51
- https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2
- https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5
- https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280
- https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217
- https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899
- https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf
- https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d