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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.