CVE-2023-23005

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-01 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel before 6.2, mm/memory-tiers.c misinterprets the alloc_memory_type return value (expects it to be NULL in the error case, whereas it is actually an error pointer). NOTE: this is disputed by third parties because there are no realistic cases in which a user can cause the alloc_memory_type error case to be reached.

Affected products

Linux kernel: before 6.2 — fixed in 6.2
SUSE Linux Enterprise Server: 15-sp5

How to fix

Upgrade to a fixed version: Linux kernel 6.2. Check the vendor advisory for mitigations.

References

https://bugzilla.suse.com/show_bug.cgi?id=1208844#c2
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2
https://github.com/torvalds/linux/commit/4a625ceee8a0ab0273534cb6b432ce6b331db5ee
https://bugzilla.suse.com/show_bug.cgi?id=1208844#c2
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2
https://github.com/torvalds/linux/commit/4a625ceee8a0ab0273534cb6b432ce6b331db5ee

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