Description
In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and this only happens for boot CPU. We need to disable it for all CPUs to guard against memory corruption e.g. on restore from hibernate. Note, writing '0' to kvmclock MSR doesn't clear memory location, it just prevents hypervisor from updating the location so for the short while after write and while CPU is still alive, the clock remains usable and correct so we don't need to switch to some other clocksource.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1e977aa12dd4f80688b1f243762212e75c6d7fe8 to < 9084fe1b3572664ad276f427dce575f580c9799aaffected1e977aa12dd4f80688b1f243762212e75c6d7fe8 to < 3b0becf8b1ecf642a9edaf4c9628ffc641e490d6affected1e977aa12dd4f80688b1f243762212e75c6d7fe8 to < 1df2dc09926f61319116c80ee85701df33577d70affected1e977aa12dd4f80688b1f243762212e75c6d7fe8 to < c02027b5742b5aa804ef08a4a9db433295533046affected
Linux Linux
Default version status: affected
2.6.26affected0 to < 2.6.26unaffected5.4.125 to ≤ 5.4.*unaffected5.10.43 to ≤ 5.10.*unaffected5.12.10 to ≤ 5.12.*unaffected5.13 to ≤ *unaffected