CVE-2024-44965: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386. These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text? Use the correct increment form for addr to avoid alignment assumptions.

Affected products

• Linux Linux Kernel: from 4.19, before 4.19.320 (fixed in 4.19.320); from 4.20, before 5.4.282 (fixed in 5.4.282); from 5.5, before 5.10.224 (fixed in 5.10.224); from 5.11, before 5.15.165 (fixed in 5.15.165); from 5.16, before 6.1.105 (fixed in 6.1.105); from 6.2, before 6.6.46 (fixed in 6.6.46); …

Published 2024-09-04. Last modified 2026-06-17.