Use-after-free in Linux kernel - CVE-2026-93205

Vulnerability identifier: #VU152193

CSH Severity: Low

CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-93205

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to a use-after-free in the IOPF queue cleanup performed by arm_smmu_device_remove() when removing an Arm SMMU device. A local privileged user can trigger device removal while the event-queue IRQ handler accesses the IOPF queue to cause a denial of service.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/2235eafda9b3df9295efd0593cd4a8977440c3f6
• https://git.kernel.org/stable/c/2bd22a0d40503a65d243b011de146603c8ce1cbc
• https://git.kernel.org/stable/c/78fd5a2d65f3546cb4285f8e52f445baecbd00e0
• https://git.kernel.org/stable/c/981686f4137760a16a03c5193f11d85133533f93

• Use-after-free in Linux kernel arm arm-smmu-v3 driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more