CVE-2023-53073

Summary

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

perf/x86/amd/core: Always clear status for idx

The variable 'status' (which contains the unhandled overflow bits) is not being properly masked in some cases, displaying the following warning:

WARNING: CPU: 156 PID: 475601 at arch/x86/events/amd/core.c:972 amd_pmu_v2_handle_irq+0x216/0x270

This seems to be happening because the loop is being continued before the status bit being unset, in case x86_perf_event_set_period() returns 0. This is also causing an inconsistency because the "handled" counter is incremented, but the status bit is not cleaned.

Move the bit cleaning together above, together when the "handled" counter is incremented.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7685665c390dc68c2d9a74e8445f41494cc8f6cf < ab33a8f7649b0324639a336e1081aaea51a4523eaffected
LinuxLinux7685665c390dc68c2d9a74e8445f41494cc8f6cf < 9d4c7b1f12e101d6d6253092588b127416ddfb6caffected
LinuxLinux7685665c390dc68c2d9a74e8445f41494cc8f6cf < 263f5ecaf7080513efc248ec739b6d9e00f4129faffected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.1.22 <= 6.1.*unaffected
LinuxLinux6.2.9 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

References