Use-after-free in Linux kernel - CVE-2026-93106

Vulnerability identifier: #VU150912

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-93106

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a use-after-free condition.

The vulnerability exists due to improper reference counting in restore_dm_crypt_keys_to_thread_keyring() when restoring more than five saved dm-crypt keys. A local user can cause multiple saved dm-crypt keys to be restored during crash dump processing to cause a use-after-free condition.

Linux kernel
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)

Install security update from vendor's repository.

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

• https://git.kernel.org/stable/c/ada2e5a44e99113e08ad9b7b71396c6c572204da
• https://git.kernel.org/stable/c/b0f7343a002f9c8b8378011f60482c76f3216dfd
• https://git.kernel.org/stable/c/ed566979f99c5516cad45a76ae25e2a4928ffb67

• Use-after-free in Linux kernel restore_dm_crypt_keys_to_thread_keyring() in kernel/crash_dump_dm_crypt.c
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more