CVE-2024-42230

Summary

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

powerpc/pseries: Fix scv instruction crash with kexec

kexec on pseries disables AIL (reloc_on_exc), required for scv instruction support, before other CPUs have been shut down. This means they can execute scv instructions after AIL is disabled, which causes an interrupt at an unexpected entry location that crashes the kernel.

Change the kexec sequence to disable AIL after other CPUs have been brought down.

As a refresher, the real-mode scv interrupt vector is 0x17000, and the fixed-location head code probably couldn't easily deal with implementing such high addresses so it was just decided not to support that interrupt at all.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7fa95f9adaee7e5cbb195d3359741120829e488b < c550679d604798d9fed8a5b2bb5693448a25407caffected
LinuxLinux7fa95f9adaee7e5cbb195d3359741120829e488b < d10e3c39001e9194b9a1bfd6979bd3fa19dccdc5affected
LinuxLinux7fa95f9adaee7e5cbb195d3359741120829e488b < 8c6506616386ce37e59b2745fc481c6713fae4f3affected
LinuxLinux7fa95f9adaee7e5cbb195d3359741120829e488b < 21a741eb75f80397e5f7d3739e24d7d75e619011affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux6.1.98 <= 6.1.*unaffected
LinuxLinux6.6.39 <= 6.6.*unaffected
LinuxLinux6.9.9 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References