Home Cyber Security News A Now-Patched Linux Kernel Vulnerability Could Lead To Data Leaks

A Now-Patched Linux Kernel Vulnerability Could Lead To Data Leaks

by Abeerah Hashim
Linux Kernel vulnerability

A serious vulnerability in Linux Kernel could leak data as it exposed stack memory. The vulnerability exists in a range of Kernel versions. Therefore, users should make sure to update to the latest version to avoid exploitation.

Linux Kernel Vulnerability Exposing Memory

Researchers from Cisco Talos spotted a serious information disclosure vulnerability in Linux Kernel.

Sharing the details in a post, the researchers stated that the bug, CVE-2020-28588, could expose stack memory to an attacker. Hence, exploiting this bug would allow an adversary to exploit the data leak and target more unpatched Linux bugs.

As stated,

An attacker could exploit this vulnerability by reading /proc/<pid>/syscall, a legitimate Linux operating system file  — making it impossible to detect on a network remotely. If utilized correctly, an attacker could leverage this information leak to successfully exploit additional unpatched Linux vulnerabilities.

Targeting this bug could allow an attacker to bypass Kernel Address Space Layout Randomization (KASLR). KASLR is a security technique to prevent the exploitation of memory corruption bugs.

The researchers found this bug on an Azure Sphere device. Investigating the flaw made them realize that the bus appeared first in v5.1-rc4 (commit 631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0).

Whereas, as per their advisory, the flaw continues to exist in the proc/pid/syscall functionality of Linux Kernel v5.4.66 and v5.9.8 as well.

Patch Deployed

The researchers discovered this vulnerability in November 2020. Following their report, the vendors merged the patch on December 3, 2020.

Cisco confirmed that the affected Kernel versions 5.10-rc4, 5.4.66, and 5.9.8 remain vulnerable to this bug. Therefore, all users must ensure updating their systems to the latest versions at the earliest.

Recently, Linux also made it to the news when researchers found two vulnerabilities allowing Spectre attacks. Those bugs evaded all then-existing mitigations. However, developers patched the flaws for the users.

Let us know your thoughts in the comments.

You may also like

Leave a Comment

Latest Hacking News

Privacy Preference Center


The __cfduid cookie is used to identify individual clients behind a shared IP address and apply security settings on a per-client basis.

cookie_notice_accepted and gdpr[allowed_cookies] are used to identify the choices made from the user regarding cookie consent.

For example, if a visitor is in a coffee shop where there may be several infected machines, but the specific visitor's machine is trusted (for example, because they completed a challenge within your Challenge Passage period), the cookie allows Cloudflare to identify that client and not challenge them again. It does not correspond to any user ID in your web application, and does not store any personally identifiable information.

__cfduid, cookie_notice_accepted, gdpr[allowed_cookies]


DoubleClick by Google refers to the DoubleClick Digital Marketing platform which is a separate division within Google. This is Google’s most advanced advertising tools set, which includes five interconnected platform components.

DoubleClick Campaign Manager: the ad-serving platform, called an Ad Server, that delivers ads to your customers and measures all online advertising, even across screens and channels.

DoubleClick Bid Manager – the programmatic bidding platform for bidding on high-quality ad inventory from more than 47 ad marketplaces including Google Display Network.

DoubleClick Ad Exchange: the world’s largest ad marketplace for purchasing display, video, mobile, Search and even Facebook inventory.

DoubleClick Search: is more powerful than AdWords and used for purchasing search ads across Google, Yahoo, and Bing.

DoubleClick Creative Solutions: for designing, delivering and measuring rich media (video) ads, interactive and expandable ads.



The _ga is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.

The _gat global object is used to create and retrieve tracker objects, from which all other methods are invoked. Therefore the methods in this list should be run only off a tracker object created using the _gat global variable. All other methods should be called using the _gaq global object for asynchronous tracking.

_gid works as a user navigates between web pages, they can use the gtag.js tagging library to record information about the page the user has seen (for example, the page's URL) in Google Analytics. The gtag.js tagging library uses HTTP Cookies to "remember" the user's previous interactions with the web pages.

_ga, _gat, _gid