CVE-2021-47567

Summary

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

powerpc/32: Fix hardlockup on vmap stack overflow

Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time.

Fix it by using a physical address instead.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc118c7303ad528be8ff2aea8cd1ee15452c763f0 < dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7affected
LinuxLinuxc118c7303ad528be8ff2aea8cd1ee15452c763f0 < c4e3ff8b8b1d54f0c755670174c453b06e17114baffected
LinuxLinuxc118c7303ad528be8ff2aea8cd1ee15452c763f0 < 5bb60ea611db1e04814426ed4bd1c95d1487678eaffected
LinuxLinux3b234b4a6651ed6bdca94553aa0038fc7ded9271affected
LinuxLinux5.9.5 < 5.10affected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux5.10.83 <= 5.10.*unaffected
LinuxLinux5.15.6 <= 5.15.*unaffected
LinuxLinux5.16 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References