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Slashdot: Microsoft Issues Warning About Linux 'Copy Fail' Vulnerability

Microsoft Issues Warning About Linux 'Copy Fail' Vulnerability
Published on 2026-05-07T20:00:00Z
joshuark shares a report from Linux Magazine: Microsoft has issued a warning that a vulnerability with a CVSS score of 7.8 has been found in the Linux kernel. The vulnerability in question is tagged CVE-2026-31431 and, according to the Cybersecurity and Infrastructure Security Agency (CISA), "This Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise." The distributions affected are Ubuntu, Red Hat, SUSE, Debian, Fedora, Arch Linux, and Amazon Linux. This could also affect any distribution based on those in the list, which means pretty much every Linux distro that isn't independent. The flaw is found in the Linux kernel cryptographic subsystem's algif_aead module of AF_ALG. The problem is that a particular optimization has led to the kernel reusing the source memory as the destination during cryptographic operations. What this means is that attackers can take advantage of interactions between the AF_ALG socket interface and a splice() system call. Until patches are released, Microsoft is advising that the affected crypto feature should be disabled, or AF_ALG socket creation should be blocked. The vulnerability is also known as "Copy Fail," which has been shared on Slashdot and detailed in a technical report. The vulnerability affects almost every version of the Linux OS and is now being exploited in the wild. U.S. cybersecurity agency CISA has ordered all civilian federal agencies to patch any affected systems by May 15.

Read more of this story at Slashdot.

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