CVE-2021-47276
"ARM64 Linux Kernel ftrace Out-of-Bounds Read"
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 30, 2025, 2:46 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47276.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47276 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47276 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 30, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-706 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.28 up to (excluding) 4.4.273 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.273 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.237 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.195 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.126 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.44 Added Reference Type CVE: https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Added Reference https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Added Reference https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Added Reference https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Added Reference https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Added Reference https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Added Reference https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Added Reference https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47276 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47276
weaknesses.