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nvd416baaa9-dc9f-4396-8d5f-8c081fb06d67NVD:CVE-2023-52872
HistoryMay 21, 2024 - 4:15 p.m.

CVE-2023-52872

2024-05-2116:15:23
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
5
linux kernel
n_gsm
race condition
status line change

AI Score

6.5

Confidence

Low

EPSS

0

Percentile

15.5%

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.

AI Score

6.5

Confidence

Low

EPSS

0

Percentile

15.5%