IT

Tracker / CVE-2023-52872

CVE-2023-52872

High 7.8

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix race condition in status line change on dead connections gsm_cleanup_mux() cleans up the gsm by closing all DLCIs, stopping all timers, removing the virtual tty devices and clearing the data queues. This procedure, however, may cause subsequent changes of the virtual modem status lines of a DLCI. More data is being added the outgoing data queue and the deleted kick timer is restarted to handle this. At this point many resources have already been removed by the cleanup procedure. Thus, a kernel panic occurs. Fix this by proving in gsm_modem_update() that the cleanup procedure has not been started and the mux is still alive. Note that writing to a virtual tty is already protected by checks against the DLCI specific connection state.

Affected products and versions

linux linux_kernel · 5.15.61 → 5.15.138
linux linux_kernel · 5.18.18 → 5.19
linux linux_kernel · 5.19.2 → 6.1.62
linux linux_kernel · 6.2 → 6.5.11
linux linux_kernel · 6.6 → 6.6.1

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