A flaw was found in the way the Linux kernel handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, processor does not deliver interrupts and exceptions, they are delivered once the first instruction after the stack switch is executed.

An unprivileged system user could use this flaw to crash the system kernel resulting in DoS.

Upstream patch: --------------- -> https://git.kernel.org/linus/d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9

Reference: ---------- -> http://www.openwall.com/lists/oss-security/2018/05/08/4

Last updated 25 August 2025

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