CVE-2023-52872

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.

• CWE-362

• https://git.kernel.org/stable/c/19d34b73234af542cc8a218cf398dee73cdb1890Patch
• https://git.kernel.org/stable/c/3a75b205de43365f80a33b98ec9289785da56243Patch
• https://git.kernel.org/stable/c/81a4dd5e6c78f5d8952fa8c9d36565db1fe01444Patch
• https://git.kernel.org/stable/c/ce4df90333c4fe65acb8b5089fdfe9b955ce976aPatch
• https://git.kernel.org/stable/c/df6cfab66ff2a44bd23ad5dd5309cb3421bb6593Patch
• https://git.kernel.org/stable/c/19d34b73234af542cc8a218cf398dee73cdb1890Patch
• https://git.kernel.org/stable/c/3a75b205de43365f80a33b98ec9289785da56243Patch
• https://git.kernel.org/stable/c/81a4dd5e6c78f5d8952fa8c9d36565db1fe01444Patch
• https://git.kernel.org/stable/c/ce4df90333c4fe65acb8b5089fdfe9b955ce976aPatch
• https://git.kernel.org/stable/c/df6cfab66ff2a44bd23ad5dd5309cb3421bb6593Patch

Published

May 21, 2024

Last Modified

Aug 4, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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