Description
This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Analysis
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Remediation
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Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
 EUVD |
EUVD-2022-54501 | This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. |
References
History
Thu, 27 Feb 2025 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | kernel: xen: delay xen_hvm_init_time_ops() if kdump is boot on vcpu>=32 | |
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threat_severity
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cvssV3_1
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Wed, 26 Feb 2025 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: xen: delay xen_hvm_init_time_ops() if kdump is boot on vcpu>=32 The sched_clock() can be used very early since commit 857baa87b642 ("sched/clock: Enable sched clock early"). In addition, with commit 38669ba205d1 ("x86/xen/time: Output xen sched_clock time from 0"), kdump kernel in Xen HVM guest may panic at very early stage when accessing &__this_cpu_read(xen_vcpu)->time as in below: setup_arch() -> init_hypervisor_platform() -> x86_init.hyper.init_platform = xen_hvm_guest_init() -> xen_hvm_init_time_ops() -> xen_clocksource_read() -> src = &__this_cpu_read(xen_vcpu)->time; This is because Xen HVM supports at most MAX_VIRT_CPUS=32 'vcpu_info' embedded inside 'shared_info' during early stage until xen_vcpu_setup() is used to allocate/relocate 'vcpu_info' for boot cpu at arbitrary address. However, when Xen HVM guest panic on vcpu >= 32, since xen_vcpu_info_reset(0) would set per_cpu(xen_vcpu, cpu) = NULL when vcpu >= 32, xen_clocksource_read() on vcpu >= 32 would panic. This patch calls xen_hvm_init_time_ops() again later in xen_hvm_smp_prepare_boot_cpu() after the 'vcpu_info' for boot vcpu is registered when the boot vcpu is >= 32. This issue can be reproduced on purpose via below command at the guest side when kdump/kexec is enabled: "taskset -c 33 echo c > /proc/sysrq-trigger" The bugfix for PVM is not implemented due to the lack of testing environment. [boris: xen_hvm_init_time_ops() returns on errors instead of jumping to end] | This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. |
| Title | xen: delay xen_hvm_init_time_ops() if kdump is boot on vcpu>=32 | |
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Wed, 26 Feb 2025 02:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: xen: delay xen_hvm_init_time_ops() if kdump is boot on vcpu>=32 The sched_clock() can be used very early since commit 857baa87b642 ("sched/clock: Enable sched clock early"). In addition, with commit 38669ba205d1 ("x86/xen/time: Output xen sched_clock time from 0"), kdump kernel in Xen HVM guest may panic at very early stage when accessing &__this_cpu_read(xen_vcpu)->time as in below: setup_arch() -> init_hypervisor_platform() -> x86_init.hyper.init_platform = xen_hvm_guest_init() -> xen_hvm_init_time_ops() -> xen_clocksource_read() -> src = &__this_cpu_read(xen_vcpu)->time; This is because Xen HVM supports at most MAX_VIRT_CPUS=32 'vcpu_info' embedded inside 'shared_info' during early stage until xen_vcpu_setup() is used to allocate/relocate 'vcpu_info' for boot cpu at arbitrary address. However, when Xen HVM guest panic on vcpu >= 32, since xen_vcpu_info_reset(0) would set per_cpu(xen_vcpu, cpu) = NULL when vcpu >= 32, xen_clocksource_read() on vcpu >= 32 would panic. This patch calls xen_hvm_init_time_ops() again later in xen_hvm_smp_prepare_boot_cpu() after the 'vcpu_info' for boot vcpu is registered when the boot vcpu is >= 32. This issue can be reproduced on purpose via below command at the guest side when kdump/kexec is enabled: "taskset -c 33 echo c > /proc/sysrq-trigger" The bugfix for PVM is not implemented due to the lack of testing environment. [boris: xen_hvm_init_time_ops() returns on errors instead of jumping to end] | |
| Title | xen: delay xen_hvm_init_time_ops() if kdump is boot on vcpu>=32 | |
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Subscriptions
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MITRE
Status: REJECTED
Assigner: Linux
Published:
Updated: 2025-02-26T11:29:50.175Z
Reserved: 2025-02-26T01:49:39.250Z
Link: CVE-2022-49101
Vulnrichment
No data.
NVD
Status : Rejected
Published: 2025-02-26T07:00:47.533
Modified: 2025-02-26T13:15:33.977
Link: CVE-2022-49101
Redhat
OpenCVE Enrichment
No data.
Weaknesses
No weakness.