Riskcovery

CVE-2024-40917

memblock: make memblock_set_node() also warn about use of MAX_NUMNODES

State
Published
Severity
Not scored
Published
Jul 12, 2024
Updated
May 23, 2026
Reserved
Jul 12, 2024

Read the record on cve.org

Description

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

memblock: make memblock_set_node() also warn about use of MAX_NUMNODES

On an (old) x86 system with SRAT just covering space above 4Gb:

ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0xfffffffff] hotplug

the commit referenced below leads to this NUMA configuration no longer being refused by a CONFIG_NUMA=y kernel (previously

NUMA: nodes only cover 6144MB of your 8185MB e820 RAM. Not used. No NUMA configuration found Faking a node at [mem 0x0000000000000000-0x000000027fffffff]

was seen in the log directly after the message quoted above), because of memblock_validate_numa_coverage() checking for NUMA_NO_NODE (only). This in turn led to memblock_alloc_range_nid()'s warning about MAX_NUMNODES triggering, followed by a NULL deref in memmap_init() when trying to access node 64's (NODE_SHIFT=6) node data.

To compensate said change, make memblock_set_node() warn on and adjust a passed in value of MAX_NUMNODES, just like various other functions already do.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 6fdc770506eb8379bf68a49d4e193c8364ac64e0 to before 4ddb7f966f3d06fcf1ba5ee298af6714b593584bAffected
  • ff6c3d81f2e86b63a3a530683f89ef393882782a to before 22f742b8f738918f683198a18ec3c691acda14c4Affected
  • ff6c3d81f2e86b63a3a530683f89ef393882782a to before e0eec24e2e199873f43df99ec39773ad3af2bff7Affected
  • 6.6.70 to before 6.6.72Affected
LinuxLinux
  • 6.8Affected
  • before 6.8Not affected
  • 6.6.72 through 6.6.*Not affected
  • 6.9.6 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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