0.0
NA
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 :

May 21, 2024, 4:54 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

Exploitability Score :

Affected Products

The following products are affected by CVE-2021-47276 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
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.

URL Resource
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

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.

  • 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]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
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.

NONE - Vulnerability Scoring System
: