CVE-2021-46953

Summary

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

ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure

When failing the driver probe because of invalid firmware properties, the GTDT driver unmaps the interrupt that it mapped earlier.

However, it never checks whether the mapping of the interrupt actially succeeded. Even more, should the firmware report an illegal interrupt number that overlaps with the GIC SGI range, this can result in an IPI being unmapped, and subsequent fireworks (as reported by Dann Frazier).

Rework the driver to have a slightly saner behaviour and actually check whether the interrupt has been mapped before unmapping things.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < c3385a9122f8db15b453e07bfc88117fce7f3724affected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < 7b2162db1498c71962a4bb2f776fa4e76d4d305baffected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < 504632a3577a049dd9bb7aabae5b4476f9c586b4affected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < e0f2d86481eaa83df33b0793f75212919db7a19daffected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < 42e69521ee1fa5abf21f478d147d06bbfe6bf6a8affected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < 596e079c362ac17ed02aa1b99fdc444d62072a01affected
LinuxLinuxca9ae5ec4ef0ed13833b03297ab319676965492c < 1ecd5b129252249b9bc03d7645a7bda512747277affected
LinuxLinux4.12affected
LinuxLinux0 < 4.12unaffected
LinuxLinux4.14.233 <= 4.14.*unaffected
LinuxLinux4.19.191 <= 4.19.*unaffected
LinuxLinux5.4.118 <= 5.4.*unaffected
LinuxLinux5.10.36 <= 5.10.*unaffected
LinuxLinux5.11.20 <= 5.11.*unaffected
LinuxLinux5.12.3 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References