CVE-2021-47255

HighCVSS 7.1/10Last modified Jun 17, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

kvm: LAPIC: Restore guard to prevent illegal APIC register access

Per the SDM, "any access that touches bytes 4 through 15 of an APIC register may cause undefined behavior and must not be executed." Worse, such an access in kvm_lapic_reg_read can result in a leak of kernel stack contents. Prior to commit 01402cf81051 ("kvm: LAPIC: write down valid APIC registers"), such an access was explicitly disallowed. Restore the guard that was removed in that commit.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 01402cf81051f796dac7c60ca11d6147153ca46a, < bf99ea52970caeb4583bdba1192c1f9b53b12c84; >= 01402cf81051f796dac7c60ca11d6147153ca46a, < 018685461a5b9a9a70e664ac77aef0d7415a3fd5; >= 01402cf81051f796dac7c60ca11d6147153ca46a, < a2aff09807fbe4018c269d3773a629949058b210; >= 01402cf81051f796dac7c60ca11d6147153ca46a, < 218bf772bddd221489c38dde6ef8e917131161f6
LinuxLinux5.3

References

Timeline

Published
May 21, 2024
Last modified
Jun 17, 2026
NVD status
Analyzed

Related CVEs from 2021

CVE-2021-472565.5In the Linux kernel, the following vulnerability has been resolved: mm/memory-failure: make sure wait for page writeback in memory_failure CVE-2021-472575.5In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: fix null deref in parse dev addr Fix a logic error thCVE-2021-472585.5In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix error handling of scsi_host_alloc() After device is inCVE-2021-472597.8In the Linux kernel, the following vulnerability has been resolved: NFS: Fix use-after-free in nfs4_init_client() KASAN reports a use-afteCVE-2021-472605.5In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a potential NULL dereference in nfs_get_client() None of the CVE-2021-472617.8In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Fix initializing CQ fragments buffer The function init_cq_fraCVE-2021-472627.1In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Ensure liveliness of nested VM-Enter fail tracepoint message CVE-2021-472635.5In the Linux kernel, the following vulnerability has been resolved: gpio: wcd934x: Fix shift-out-of-bounds error bit-mask for pins 0 to 4 CVE-2021-472645.5In the Linux kernel, the following vulnerability has been resolved: ASoC: core: Fix Null-point-dereference in fmt_single_name() Check the CVE-2021-472655.5In the Linux kernel, the following vulnerability has been resolved: RDMA: Verify port when creating flow rule Validate port value providedCVE-2021-472665.5In the Linux kernel, the following vulnerability has been resolved: RDMA/ipoib: Fix warning caused by destroying non-initial netns After tCVE-2021-472676.3In the Linux kernel, the following vulnerability has been resolved: usb: fix various gadget panics on 10gbps cabling usb_assign_descriptor