Use-after-free in Linux kernel - CVE-2026-98211
Published: October 7, 2026
Vulnerability identifier: #VU153808
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98211
CWE-ID: CWE-416
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 use-after-free in the MMCI driver's busy-timeout work when removing a device with delayed work still queued for an R1b command. A local user can trigger device removal while this work remains queued to cause a denial of service.
The delayed work can subsequently dereference the device-managed mmci_host allocation after it has been released.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98211
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1