Use-after-free in Linux kernel - CVE-2026-64103
Published: July 20, 2026
Vulnerability identifier: #VU138535
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64103
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the isci completion tasklet in the ISCI driver when removing a device or unloading the driver while queued tasklet processing is still possible. A local user can trigger device removal or driver unload to cause a denial of service.
The stale callback may dereference ihost and access ihost->smu_registers after the host lifetime ends.
How to mitigate CVE-2026-64103
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806
- https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989
- https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c
- https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1
- https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2
- https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426
- https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3
- https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539b