12,194guides5,442members
8 Octporterneuman.mx: PowerShell and JavaScript files tied to the AveMaria remote access trojan, and what to do8 Octdonutclientsmods.xyz: fake DonutSMP Minecraft mods tagged SilentNet, and what to do if you ran one8 Octsqpengg.com: a server handing out crypted PowerShell scripts, and what to do if one ran on your PC8 Octdonutsmpcheats.org: fake Minecraft cheat mods with the SilentNet stealer, and what to do if you installed one8 Octmaciejbi.hosting24.pl: a hosting subdomain that served Remcos scripts and a stego picture, and what to do if your PC fetched them8 Oct87130921-60-20220830152356.webstarterz.com: an open folder serving Formbook and XWorm PowerShell scripts, and what to do if one ran8 Octficus.in: picture files hiding the Remcos remote access trojan, and what to do if a script fetched them8 OctOpenDrive virus: why web.opendrive.com shows up in malware alerts, and what to do if a file from it installed Remcos

Actively exploited vulnerability

Linux Kernel: memory corruption flaw under attack

CVE-2023-0266 · Linux Kernel Use-After-Free Vulnerability

Concerns everyone who uses it7.0 high

What is affected

Linux Kernel is found on ordinary personal computers and phones, so this is not only a problem for companies. If you use it and have not updated since the fix was released, you are exposed.

Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.

CISA's description

What an attacker can do

This is a memory corruption flaw. It lets an attacker corrupt the program's memory by feeding it specially crafted content: a web page, a file or a network message. The result ranges from a crash to the attacker running their own code.

How it is reached
Needs access to the device or a file opened on it
Access the attacker needs
A basic user account
Does the victim have to do something?
No, works without the victim doing anything

What to do

  1. Update Linux Kernel now. Open the update or "About" screen, install whatever is offered and restart the app or device, because the fix is not active until you do.
  2. Turn on automatic updates so the next fix arrives without you having to look for it.
  3. If your device is too old to receive this update, stop using the affected app for anything sensitive and plan a replacement.

Apply updates per vendor instructions.

Action required by CISA for US federal agencies

Vendor advisories and fixes

  • git.kernel.orggit.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-m

How urgent is it

CISA added this vulnerability to its Known Exploited Vulnerabilities catalogue on March 30, 2023, which means there is reliable evidence of attacks in the wild. US federal agencies must fix it by April 20, 2023, a deadline that has already passed. That deadline does not bind anyone else, but it shows how seriously the agency rates it.

The EPSS model estimates a 3.7% probability that this flaw will be exploited somewhere in the next 30 days. That is higher than 89% of all scored vulnerabilities.

Its CVSS severity score is 7.0 out of 10 (high), as recorded in the US National Vulnerability Database.

Technical description

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

NIST National Vulnerability Database
5,442 members already hereReading, writing, commenting and voting. 0 verified · 167 joined this year
All membersJoin