cve-2021-47110
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2024-11-04 11:59
Severity ?
EPSS score ?
Summary
x86/kvm: Disable kvmclock on all CPUs on shutdown
References
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"id": "CVE-2021-47110",
"options": [
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"Exploitation": "none"
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"Automatable": "no"
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"Technical Impact": "partial"
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"role": "CISA Coordinator",
"timestamp": "2024-03-18T16:10:03.353776Z",
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/include/asm/kvm_para.h",
"arch/x86/kernel/kvm.c",
"arch/x86/kernel/kvmclock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kvm: Disable kvmclock on all CPUs on shutdown\n\nCurrenly, we disable kvmclock from machine_shutdown() hook and this\nonly happens for boot CPU. We need to disable it for all CPUs to\nguard against memory corruption e.g. on restore from hibernate.\n\nNote, writing \u00270\u0027 to kvmclock MSR doesn\u0027t clear memory location, it\njust prevents hypervisor from updating the location so for the short\nwhile after write and while CPU is still alive, the clock remains usable\nand correct so we don\u0027t need to switch to some other clocksource."
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"title": "x86/kvm: Disable kvmclock on all CPUs on shutdown",
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"cveId": "CVE-2021-47110",
"datePublished": "2024-03-15T20:14:19.183Z",
"dateReserved": "2024-03-04T18:12:48.836Z",
"dateUpdated": "2024-11-04T11:59:36.144Z",
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47110\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-15T21:15:06.530\",\"lastModified\":\"2024-03-17T22:38:29.433\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/kvm: Disable kvmclock on all CPUs on shutdown\\n\\nCurrenly, we disable kvmclock from machine_shutdown() hook and this\\nonly happens for boot CPU. We need to disable it for all CPUs to\\nguard against memory corruption e.g. on restore from hibernate.\\n\\nNote, writing \u00270\u0027 to kvmclock MSR doesn\u0027t clear memory location, it\\njust prevents hypervisor from updating the location so for the short\\nwhile after write and while CPU is still alive, the clock remains usable\\nand correct so we don\u0027t need to switch to some other clocksource.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/kvm: deshabilite kvmclock en todas las CPU al apagar Actualmente, deshabilitamos kvmclock desde el enlace machine_shutdown() y esto solo sucede para la CPU de arranque. Necesitamos deshabilitarlo para todas las CPU para protegernos contra la corrupci\u00f3n de la memoria, por ejemplo, al restaurar desde la hibernaci\u00f3n. Tenga en cuenta que escribir \u00270\u0027 en kvmclock MSR no borra la ubicaci\u00f3n de la memoria, solo evita que el hipervisor actualice la ubicaci\u00f3n, por lo que durante un breve per\u00edodo despu\u00e9s de la escritura y mientras la CPU a\u00fan est\u00e1 activa, el reloj permanece utilizable y correcto, por lo que no lo necesitamos. para cambiar a alguna otra fuente de reloj.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.