CVE-2024-44965

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < 18da1b27ce16a14a9b636af9232acb4fb24f4c9eaffected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < 25a727233a40a9b33370eec9f0cad67d8fd312f8affected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6affected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < 4d143ae782009b43b4f366402e5c37f59d4e4346affected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < 5c580c1050bcbc15c3e78090859d798dcf8c9763affected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2edaffected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < df3eecb5496f87263d171b254ca6e2758ab3c35caffected
LinuxLinux16a3fe634f6a568c6234b8747e5d50487fed3526 < 41e71dbb0e0a0fe214545fe64af031303a08524caffected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux4.19.320 <= 4.19.*unaffected
LinuxLinux5.4.282 <= 5.4.*unaffected
LinuxLinux5.10.224 <= 5.10.*unaffected
LinuxLinux5.15.165 <= 5.15.*unaffected
LinuxLinux6.1.105 <= 6.1.*unaffected
LinuxLinux6.6.46 <= 6.6.*unaffected
LinuxLinux6.10.5 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References