CVE-2023-52872 Affecting kernel-rt-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTKVM-7079537
- published 23 May 2024
- disclosed 21 May 2024
How to fix?
There is no fixed version for Centos:7 kernel-rt-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2023-52872
- https://git.kernel.org/stable/c/19d34b73234af542cc8a218cf398dee73cdb1890
- https://git.kernel.org/stable/c/3a75b205de43365f80a33b98ec9289785da56243
- https://git.kernel.org/stable/c/81a4dd5e6c78f5d8952fa8c9d36565db1fe01444
- https://git.kernel.org/stable/c/ce4df90333c4fe65acb8b5089fdfe9b955ce976a
- https://git.kernel.org/stable/c/df6cfab66ff2a44bd23ad5dd5309cb3421bb6593