CVE-2021-47006

Summary

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

ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook

The commit 1879445dfa7b ("perf/core: Set event's default ::overflow_handler()") set a default event->overflow_handler in perf_event_alloc(), and replace the check event->overflow_handler with is_default_overflow_handler(), but one is missing.

Currently, the bp->overflow_handler can not be NULL. As a result, enable_single_step() is always not invoked.

Comments from Zhen Lei:

https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < 555a70f7fff03bd669123487905c47ae27dbdaacaffected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < ed1f67465327cec4457bb988775245b199da86e6affected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < a9938d6d78a238d6ab8de57a4d3dcf77adceb9bbaffected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < 3ed8832aeaa9a37b0fc386bb72ff604352567c80affected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < 630146203108bf6b8934eec0dfdb3e46dcb917deaffected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < 7eeacc6728c5478e3c01bc82a1f08958eaa12366affected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < dabe299425b1a53a69461fed7ac8922ea6733a25affected
LinuxLinux1879445dfa7bbd6fe21b09c5cc72f4934798afed < a506bd5756290821a4314f502b4bafc2afcf5260affected
LinuxLinux4.7affected
LinuxLinux0 < 4.7unaffected
LinuxLinux4.9.269 <= 4.9.*unaffected
LinuxLinux4.14.233 <= 4.14.*unaffected
LinuxLinux4.19.191 <= 4.19.*unaffected
LinuxLinux5.4.120 <= 5.4.*unaffected
LinuxLinux5.10.38 <= 5.10.*unaffected
LinuxLinux5.11.22 <= 5.11.*unaffected
LinuxLinux5.12.5 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References