A severe security vulnerability affecting almost every version of the Linux operating system has caught defenders off-guard and scrambling to patch after security researchers publicly released exploit code that allows attackers to take complete control of vulnerable systems.
Cybersecurity experts warn the bug dubbed Copy Fail is now being exploited in the wild meaning it is being actively used in malicious hacking campaigns, posing significant risks to Pakistani organizations running Linux-based infrastructure.
The bug officially tracked as CVE-2026-31431 and discovered in Linux kernel versions 7.0 and earlier was disclosed to the Linux kernel security team in late March and patched after about a week, however the patches have yet to fully trickle down to the many Linux distributions that rely on the vulnerable kernel leaving any system running an affected Linux version at risk of compromise.
Linux is widely used in enterprise settings running the computers that operate much of the world’s data centers including those in Pakistan.
According to security firm Theori which discovered Copy Fail, the vulnerability was verified in several widely used versions of Linux including Red Hat Enterprise Linux 10.1, Ubuntu 24.04 LTS, Amazon Linux 2023 as well as SUSE 16, all of which are commonly deployed across Pakistani government agencies, banks, telecommunications companies and technology firms. The bug is called Copy Fail because the affected component in the Linux kernel does not copy certain data when it should, corrupting sensitive data within the kernel allowing attackers to gain full administrator access on affected systems.
For Pakistani organizations, the implications are particularly severe given the country’s growing reliance on Linux-based infrastructure for banking systems, telecommunications networks, government services and the rapidly expanding technology sector. The Copy Fail bug cannot be exploited over the internet on its own but can be weaponized if chained with another vulnerability, potentially exposing sensitive Pakistani customer data, financial records and government information.
The United States cybersecurity agency CISA has ordered all civilian federal agencies to patch any affected systems by May 15. According to Microsoft:
- Identify all instances of affected products/versions in your environment.
- Apply mitigation based on patch availability:
- If patches exist, apply immediately. Links to security bulletins and vendor patches are available at NVD – CVE-2026-31431.
- If no patches exist, choose one of these interim mitigations:
- Disable affected feature
- Implement network isolation
- Apply access controls
- Review logs for signs of exploitation.
Because this vulnerability impacts a large swath of Linux devices, it is strongly recommended to do the following:
- Patch or update your distribution’s kernel packages or to block AF_ALG socket creation
- Treat any container RCE as potential host compromise and enforce rapid node recycling after compromise indicators.
