CVE-2021-47276

MEDIUM
Published May 21, 2024 Modified Apr 30, 2025 CWE-706

Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-706 CWE-706

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7

Frequently Asked Questions

What is CVE-2021-47276? +
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47276? +
CVE-2021-47276 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47276? +
CVE-2021-47276 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47276? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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