What’s Vulnerable › Vulnerabilities

CVE-2021-47407: KVM: x86: Handle SRCU initialization failure during page track init

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Handle SRCU initialization failure during page track init Check the return of init_srcu_struct(), which can fail due to OOM, when initializing the page track mechanism. Lack of checking leads to a NULL pointer deref found by a modified syzkaller. [Move the call towards the beginning of kvm_arch_init_vm. - Paolo]

Affected products

• Linux kernel: before 5.10.71; from 5.11 before 5.14.10; 5.15-rc1, 5.15-rc2, 5.15-rc3 — fixed in 5.10.71, 5.14.10

How to fix

Upgrade to a fixed version: Linux kernel 5.10.71, 5.14.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23
• https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4
• https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb
• https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23
• https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4
• https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb

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