CVE-2023-53254

Summary

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

cacheinfo: Fix shared_cpu_map to handle shared caches at different levels

The cacheinfo sets up the shared_cpu_map by checking whether the caches with the same index are shared between CPUs. However, this will trigger slab-out-of-bounds access if the CPUs do not have the same cache hierarchy. Another problem is the mismatched shared_cpu_map when the shared cache does not have the same index between CPUs.

CPU0 I D L3 index 0 1 2 x ^ ^ ^ ^ index 0 1 2 3 CPU1 I D L2 L3

This patch checks each cache is shared with all caches on other CPUs.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux246246cbde5e840012f853e27630ebb59f409486 < 2f588d0345d69a35e451077afed428fd057a5e34affected
LinuxLinux246246cbde5e840012f853e27630ebb59f409486 < dea49f2993f57d8a2df2cacb0bf649ef49b28879affected
LinuxLinux246246cbde5e840012f853e27630ebb59f409486 < 198102c9103fc78d8478495971947af77edb05c1affected
LinuxLinux3.19affected
LinuxLinux0 < 3.19unaffected
LinuxLinux6.1.18 <= 6.1.*unaffected
LinuxLinux6.2.5 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References