Use-after-free in Linux kernel - CVE-2026-68381
Published: August 12, 2026
Vulnerability identifier: #VU141665
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68381
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a use-after-free in async oplock and lease break notification handling in fs/smb/server/oplock.c when processing asynchronous oplock break notifications during connection teardown. A remote user can trigger a race condition to cause a denial of service.
Exploitation requires a race between connection teardown and an oplock or lease break notification.
Affected software
Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
Ubuntu
linux-nvidia-tegra (Ubuntu package)
How to mitigate CVE-2026-68381
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
External References
- https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6
- https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372
- https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258
- https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88
- https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9