Riskcovery

CVE-2024-41021

s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()

State
Published
Severity
Not scored
Published
Jul 29, 2024
Updated
May 11, 2026
Reserved
Jul 12, 2024

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • af19487f00f34ff8643921d7909dbb3fedc7e329 to before 73a9260b7366d2906ec011e100319359fe2277d0Affected
  • af19487f00f34ff8643921d7909dbb3fedc7e329 to before 9e13767ccefdc4f8aa92514b592b60f6b54882ffAffected
  • af19487f00f34ff8643921d7909dbb3fedc7e329 to before a3aefb871222a9880602d1a44a558177b4143e3bAffected
  • af19487f00f34ff8643921d7909dbb3fedc7e329 to before df39038cd89525d465c2c8827eb64116873f141aAffected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.44 through 6.6.*Not affected
  • 6.9.12 through 6.9.*Not affected
  • 6.10.2 through 6.10.*Not affected
  • 6.11 and laterNot affected

References

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