Improper update of reference count in Linux kernel - CVE-2026-93105
Published: September 18, 2026
Vulnerability identifier: #VU150911
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-2026-93105
CWE-ID: CWE-911
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to free a page that is still in use.
The vulnerability exists due to improper reference count handling in the ESP esp_ssg_unref() function when processing an ESP packet with managed fragments during an AEAD operation. A local user can process an ESP packet with managed fragments to free a page that is still in use.
Managed fragments can be attached through io_uring SEND_ZC with a registered buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-93105
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3