#VU94154 Input validation error in Linux kernel - CVE-2020-27673
Published: October 22, 2020 / Updated: August 22, 2023
Linux kernel
Linux Foundation
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within the clear_linked(), consume_one_event(), __evtchn_fifo_handle_events() and evtchn_fifo_percpu_init() functions in drivers/xen/events/events_fifo.c, within the module_param(), DEFINE_RWLOCK(), enable_dynirq(), notify_remote_via_irq(), EXPORT_SYMBOL_GPL(), xen_irq_init(), xen_free_irq(), xen_send_IPI_one(), __xen_evtchn_do_upcall(), xen_setup_callback_vector(), xen_evtchn_cpu_prepare() and xen_init_IRQ() functions in drivers/xen/events/events_base.c, within the active_evtchns() and evtchn_2l_handle_events() functions in drivers/xen/events/events_2l.c. A local user can perform a denial of service (DoS) attack.
Remediation
External links
- https://xenbits.xen.org/xsa/advisory-332.html
- https://github.com/torvalds/linux/commit/e99502f76271d6bc4e374fe368c50c67a1fd3070
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e99502f76271d6bc4e374fe368c50c67a1fd3070
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
- https://security.gentoo.org/glsa/202011-06
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- http://www.openwall.com/lists/oss-security/2021/01/19/6