# CVE-2024-40917: linux: In the Linux kernel, the following vulnerability has been resolved:  memblock: make memblock_set_node() also warn abo...

CVE-2024-40917 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-40917, released July 12, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-40917
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 12, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-40917](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40917.md) | Jul 12, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-40917](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40917.md) | Jul 12, 2024 |

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