Use-after-free in Linux kernel - CVE-2026-90353
Published: September 19, 2026
Vulnerability identifier: #VU151440
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90353
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise system confidentiality, integrity, and availability.
The vulnerability exists due to use-after-free in the mt7915 wireless driver's registration error path when main PHY debugfs initialization or coredump registration fails after successful external PHY registration. A local user can exploit the external PHY hardware object being freed while still registered with mac80211 to compromise system confidentiality, integrity, and availability.
The error cleanup calls mt76_unregister_device(), which unregisters only the main hardware object.
Affected software
Linux kernel
How to mitigate CVE-2026-90353
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/15b960014f24dce5388d4a2e7274e6490cb3c421
- https://git.kernel.org/stable/c/34058ad122f7524e33df8e38caba4b1d803b025a
- https://git.kernel.org/stable/c/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd
- https://git.kernel.org/stable/c/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5
- https://git.kernel.org/stable/c/aa55bec92ba7747dd08feff409f8074c5e052e71
- https://git.kernel.org/stable/c/ad706fcf6255494613b94418e7243d98065dbeaf