CVE-2024-44965

x86/mm: Fix pti_clone_pgtable() alignment assumption

State: Published
Severity: Not scored
Published: Sep 4, 2024
Updated: Oct 15, 2026
Reserved: Aug 21, 2024

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	16a3fe634f6a568c6234b8747e5d50487fed3526 to before 18da1b27ce16a14a9b636af9232acb4fb24f4c9eAffected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before 25a727233a40a9b33370eec9f0cad67d8fd312f8Affected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6Affected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before 4d143ae782009b43b4f366402e5c37f59d4e4346Affected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before 5c580c1050bcbc15c3e78090859d798dcf8c9763Affected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2edAffected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before df3eecb5496f87263d171b254ca6e2758ab3c35cAffected 16a3fe634f6a568c6234b8747e5d50487fed3526 to before 41e71dbb0e0a0fe214545fe64af031303a08524cAffected
LinuxLinux	4.19Affected before 4.19Not affected 4.19.320 through 4.19.Not affected 5.4.282 through 5.4.Not affected 5.10.224 through 5.10.Not affected 5.15.165 through 5.15.Not affected 6.1.105 through 6.1.Not affected 6.6.46 through 6.6.Not affected 6.10.5 through 6.10.*Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

16a3fe634f6a568c6234b8747e5d50487fed3526 to before 18da1b27ce16a14a9b636af9232acb4fb24f4c9eAffected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before 25a727233a40a9b33370eec9f0cad67d8fd312f8Affected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6Affected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before 4d143ae782009b43b4f366402e5c37f59d4e4346Affected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before 5c580c1050bcbc15c3e78090859d798dcf8c9763Affected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2edAffected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before df3eecb5496f87263d171b254ca6e2758ab3c35cAffected
16a3fe634f6a568c6234b8747e5d50487fed3526 to before 41e71dbb0e0a0fe214545fe64af031303a08524cAffected

LinuxLinux

4.19Affected
before 4.19Not affected
4.19.320 through 4.19.*Not affected
5.4.282 through 5.4.*Not affected
5.10.224 through 5.10.*Not affected
5.15.165 through 5.15.*Not affected
6.1.105 through 6.1.*Not affected
6.6.46 through 6.6.*Not affected
6.10.5 through 6.10.*Not affected
6.11 and laterNot affected

References

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