CVE-2026-90046 in Linux
Sumário
de MITRE • 16/09/2026
In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: don't spin_trylock() in NMI on UP
Patch series "mm/page_alloc: fixes for free_pages_nolock() on RT/UP".
Pre-existing bugs found by Sashiko during review of this other series: https://lore.kernel.org/all/[email protected]/
I have not reproduced these bugs, and I suspect there is no real-world user that is affected by them.
This patch (of 2):
As noted in can_spin_trylock(), using this is unsafe in this context. commit 620b46ed6ae17 ("mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP") fixed this on the alloc side but missed the free side.
Impact: If BPF programs using these features in NMI (probably tracing) are present on non-SMP builds this might crash the kernel and is probably exploitable by local attackers for privilege escalation.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.