CVE-2024-40984

Summary

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

ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."

Undo the modifications made in commit d410ee5109a1 ("ACPICA: avoid "Info: mapping multiple BARs. Your kernel is fine.""). The initial purpose of this commit was to stop memory mappings for operation regions from overlapping page boundaries, as it can trigger warnings if different page attributes are present.

However, it was found that when this situation arises, mapping continues until the boundary's end, but there is still an attempt to read/write the entire length of the map, leading to a NULL pointer deference. For example, if a four-byte mapping request is made but only one byte is mapped because it hits the current page boundary's end, a four-byte read/write attempt is still made, resulting in a NULL pointer deference.

Instead, map the entire length, as the ACPI specification does not mandate that it must be within the same page boundary. It is permissible for it to be mapped across different regions.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < 435ecc978c3d5d0c4e172ec5b956dc1904061d98affected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < ae465109d82f4fb03c5adbe85f2d6a6a3d59124caffected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < 6eca23100e9030725f69c1babacd58803f29ec8daffected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < dc5017c57f5eee80020c73ff8b67ba7f9fd08b1faffected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < ddc1f5f124479360a1fd43f73be950781d172239affected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < 434c6b924e1f4c219aab2d9e05fe79c5364e37d3affected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < e21a4c9129c72fa54dd00f5ebf71219b41d43c04affected
LinuxLinuxd410ee5109a1633a686a5663c6743a92e1181f9b < a83e1385b780d41307433ddbc86e3c528db031f0affected
LinuxLinux2.6.32affected
LinuxLinux0 < 2.6.32unaffected
LinuxLinux4.19.317 <= 4.19.*unaffected
LinuxLinux5.4.279 <= 5.4.*unaffected
LinuxLinux5.10.221 <= 5.10.*unaffected
LinuxLinux5.15.162 <= 5.15.*unaffected
LinuxLinux6.1.96 <= 6.1.*unaffected
LinuxLinux6.6.36 <= 6.6.*unaffected
LinuxLinux6.9.7 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

Additional References

References