CVE-2024-44965
Last modified
CVE-2024-44965 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 4.19.320 | — |
| Linux | Linux Kernel | >= 4.20, < 5.4.282 | — |
| Linux | Linux Kernel | >= 5.5, < 5.10.224 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.165 | — |
| Linux | Linux Kernel | >= 5.16, < 6.1.105 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.46 | — |
| Linux | Linux Kernel | >= 6.7, < 6.10.5 | — |
| Linux | Linux Kernel | 6.11 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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