CVE-2026-90046mm/page_alloc: don't spin_trylock() in NMI on UP
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com/ 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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 8c57b687e8331eb80e302a2c528b18b966a9ac7a builds before 06c76d3c389ff504052f64b1acee44651bd847fa; from 8c57b687e8331eb80e302a2c528b18b966a9ac7a before 68a069b407303e71db371df85036101e8ff59280; from 8c57b687e8331eb80e302a2c528b18b966a9ac7a before 3105ae628fb785d48b49256468be4f21a7b3cfc0 | CNA record |
References
- https://git.kernel.org/stable/c/06c76d3c389ff504052f64b1acee44651bd847fa
- https://git.kernel.org/stable/c/68a069b407303e71db371df85036101e8ff59280
- https://git.kernel.org/stable/c/3105ae628fb785d48b49256468be4f21a7b3cfc0
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.