CVE-2024-41021

Summary

In the Linux kernel, the following vulnerability has been resolved:

s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()

There is no support for HWPOISON, MEMORY_FAILURE, or ARCH_HAS_COPY_MC on s390. Therefore we do not expect to see VM_FAULT_HWPOISON in do_exception().

However, since commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general"), it is possible to see VM_FAULT_HWPOISON in combination with PTE_MARKER_POISONED, even on architectures that do not support HWPOISON otherwise. In this case, we will end up on the BUG() in do_exception().

Fix this by treating VM_FAULT_HWPOISON the same as VM_FAULT_SIGBUS, similar to x86 when MEMORY_FAILURE is not configured. Also print unexpected fault flags, for easier debugging.

Note that VM_FAULT_HWPOISON_LARGE is not expected, because s390 cannot support swap entries on other levels than PTE level.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxaf19487f00f34ff8643921d7909dbb3fedc7e329 < 73a9260b7366d2906ec011e100319359fe2277d0affected
LinuxLinuxaf19487f00f34ff8643921d7909dbb3fedc7e329 < 9e13767ccefdc4f8aa92514b592b60f6b54882ffaffected
LinuxLinuxaf19487f00f34ff8643921d7909dbb3fedc7e329 < a3aefb871222a9880602d1a44a558177b4143e3baffected
LinuxLinuxaf19487f00f34ff8643921d7909dbb3fedc7e329 < df39038cd89525d465c2c8827eb64116873f141aaffected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.44 <= 6.6.*unaffected
LinuxLinux6.9.12 <= 6.9.*unaffected
LinuxLinux6.10.2 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References