Use of uninitialized resource in Linux kernel - CVE-2026-90056
Published: September 19, 2026
Vulnerability identifier: #VU151423
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-90056
CWE-ID: CWE-908
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 of an uninitialized resource in the FEC Ethernet driver PTP cleanup paths when handling failed device initialization or device removal. A local user can trigger failed device initialization or device removal to cause a denial of service.
PTP initialization is performed only when extended buffer descriptors are available.
Affected software
Linux kernel
How to mitigate CVE-2026-90056
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/0602a4c238d2b6ed6e2bf5fa8ef7fa0203883dac
- https://git.kernel.org/stable/c/0dc8b3a395c3a749ab62c078f2fd54a402ae7e2b
- https://git.kernel.org/stable/c/1973f108c481fab9bdc7daa6c77442af4a7388ab
- https://git.kernel.org/stable/c/1f9639caeece703012bdb23975ebedf70f426269
- https://git.kernel.org/stable/c/383f699a86fd04458dc47d10578c17e94f63d92f
- https://git.kernel.org/stable/c/5975009651c4e5ec1492612962d0dd3dc86f6bda
- https://git.kernel.org/stable/c/7566789664813c1778f0d4b7e0539fd863ea450c
- https://git.kernel.org/stable/c/dd890ae29299636fb037276fc1b5238698d08b03