CVE-2024-44965: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
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	All

References

Advisories & Patches

https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9e https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8 https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346 https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763 https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6 https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c

Other References

https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-44965? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-44965? +

CVE-2024-44965 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-44965? +

CVE-2024-44965 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-44965? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-44965