CVE-2026-90046
Description
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.
How to fix
- Linux Linux06c76d3c389ff504052f64b1acee44651bd847fa, 68a069b407303e71db371df85036101e8ff59280, 3105ae628fb785d48b49256468be4f21a7b3cfc0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8c57b687e8331eb80e302a2c528b18b966a9ac7a ≤ v < 06c76d3c389ff504052f64b1acee44651bd847fa, 8c57b687e8331eb80e302a2c528b18b966a9ac7a ≤ v < 68a069b407303e71db371df85036101e8ff59280, 8c57b687e8331eb80e302a2c528b18b966a9ac7a ≤ v < 3105ae628fb785d48b49256468be4f21a7b3cfc0, 6.15 | 06c76d3c389ff504052f64b1acee44651bd847fa, 68a069b407303e71db371df85036101e8ff59280, 3105ae628fb785d48b49256468be4f21a7b3cfc0 |
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