- Vulnerability/
- CVE-2024-40917
CVE-2024-40917: memblock: make memblock_set_node() also warn about use of MAX_NUMNODES
First published: Fri Jul 12 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/22f742b8f738918f683198a18ec3c691acda14c4
- https://git.kernel.org/stable/c/e0eec24e2e199873f43df99ec39773ad3af2bff7
- https://git.kernel.org/linus/e0eec24e2e199873f43df99ec39773ad3af2bff7
- https://security-tracker.debian.org/tracker/CVE-2024-40917
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40917
- https://nvd.nist.gov/vuln/detail/CVE-2024-40917
- https://launchpad.net/bugs/cve/CVE-2024-40917
- https://ubuntu.com/security/CVE-2024-40917
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