imPC@ndo IT

Tracker / CVE-2023-0461

CVE-2023-0461

High 7.8

There is a use-after-free vulnerability in the Linux Kernel which can be exploited to achieve local privilege escalation. To reach the vulnerability kernel configuration flag CONFIG_TLS or CONFIG_XFRM_ESPINTCP has to be configured, but the operation does not require any privilege. There is a use-after-free bug of icsk_ulp_data of a struct inet_connection_sock. When CONFIG_TLS is enabled, user can install a tls context (struct tls_context) on a connected tcp socket. The context is not cleared if this socket is disconnected and reused as a listener. If a new socket is created from the listener, the context is inherited and vulnerable. The setsockopt TCP_ULP operation does not require any privilege. We recommend upgrading past commit 2c02d41d71f90a5168391b6a5f2954112ba2307c

Affected products and versions

linux linux_kernel
linux linux_kernel · 4.13.0 → 4.14.303
linux linux_kernel · 4.19 → 4.19.270
linux linux_kernel · 5.10 → 5.10.163
linux linux_kernel · 5.15 → 5.15.88
linux linux_kernel · 5.4 → 5.4.229
linux linux_kernel · 6.0 → 6.0.19
linux linux_kernel · 6.1 → 6.1.5

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References