CVE-2021-47255
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
Product
Linux Kernel
PublishedMay 21, 2024
First seenMay 21, 2024
How to fix
Update
- linux linux_kernel5.4.128, 5.10.46, 5.12.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.3 ≤ v < 5.4.128, 5.5 ≤ v < 5.10.46, 5.11 ≤ v < 5.12.13, 5.13 | 5.4.128, 5.10.46, 5.12.13 |
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