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Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years

Unit 42 · published 5 May 2026

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https://copy.fail/
copy.fail
https://nvd.nist.gov/vuln/detail/CVE-2026-31431
nvd.nist.gov
https://xint.io/blog/copy-fail-linux-distributions
xint.io
https://www.microsoft.com/en-us/security/blog/2026/05/01/cve-2026-31431-copy-fail-vulnerability-enables-linux-root-privilege-escalation/
microsoft.com
https://ubuntu.com/blog/copy-fail-vulnerability-fixes-available
ubuntu.com
https://access.redhat.com/solutions/7142032
access.redhat.com
https://debiansupport.com/blog/copy-fail-cve-2026-31431-mitigation/
debiansupport.com
https://www.suse.com/c/addressing-copy-fail-in-suse-virtualization/
suse.com
https://docs.paloaltonetworks.com/ngfw
docs.paloaltonetworks.com
https://docs.paloaltonetworks.com/advanced-threat-prevention/administration
docs.paloaltonetworks.com
https://docs-cortex.paloaltonetworks.com/r/Cortex-CLOUD/Cortex-Cloud-Runtime-Security-Documentation/Endpoint-protection
docs-cortex.paloaltonetworks.com
https://www.paloaltonetworks.com/cortex/cortex-xdr?_gl=1*13pmp8e*_ga*NzQyNjM2NzkuMTY2NjY3OTczNw..*_ga_KS2MELEEFC*MTY2OTczNjA2MS4zMS4wLjE2Njk3MzYwNjEuNjAuMC4w
paloaltonetworks.com
https://www.paloaltonetworks.com/resources/datasheets/cortex-xsiam-aag
paloaltonetworks.com
https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/
lore.kernel.org
https://start.paloaltonetworks.com/contact-unit42.html
start.paloaltonetworks.com
https://github.com/torvalds/linux/commit/72548b093ee3
github.com
https://github.com/torvalds/linux/commit/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
github.com
https://www.redhat.com/es/blog/understanding-and-mitigating-dirty-cow-vulnerability
redhat.com
https://access.redhat.com/security/vulnerabilities/RHSB-2022-002
access.redhat.com
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
git.kernel.org
https://docs.paloaltonetworks.com/wildfire
docs.paloaltonetworks.com
https://docs-cortex.paloaltonetworks.com/r/Cortex-XDR/Cortex-XDR-3.x-Documentation/Malware-protection
docs-cortex.paloaltonetworks.com
https://www.paloaltonetworks.com/blog/cloud-security/visibility-governance-automation/
paloaltonetworks.com