CVE-2021-47407
Last modified
CVE-2021-47407 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.
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]
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | < 5.10.71 | — |
| Linux | Linux Kernel | >= 5.11, < 5.14.10 | — |
| Linux | Linux Kernel | 5.15 | Rc1 |
References
- https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
- https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
- https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch
- https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
- https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
- https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch
Timeline
- Published
- Last Modified
- Status
- Analyzed
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- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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