CVE-2023-52740

Summary

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

powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch

The RFI and STF security mitigation options can flip the interrupt_exit_not_reentrant static branch condition concurrently with the interrupt exit code which tests that branch.

Interrupt exit tests this condition to set MSR[EE|RI] for exit, then again in the case a soft-masked interrupt is found pending, to recover the MSR so the interrupt can be replayed before attempting to exit again. If the condition changes between these two tests, the MSR and irq soft-mask state will become corrupted, leading to warnings and possible crashes. For example, if the branch is initially true then false, MSR[EE] will be 0 but PACA_IRQ_HARD_DIS clear and EE may not get enabled, leading to warnings in irq_64.c.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux13799748b957bc5659f97c036224b0f4b42172e2 < 86f7e423933608d536015a0f2eb9e0338c1227e0affected
LinuxLinux13799748b957bc5659f97c036224b0f4b42172e2 < 6f097c24815e67909a1fcc2c605586d02babd673affected
LinuxLinux13799748b957bc5659f97c036224b0f4b42172e2 < 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.94 <= 5.15.*unaffected
LinuxLinux6.1.12 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References