EUVD-2026-38899
GHSA-qf6r-crjw-4c6m
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local trigger via BPF requires privileges to load programs (PR:L) but no user interaction; unchecked node_id causes kernel OOB with high C/I/A and no scope change.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
bpf: Validate node_id in arena_alloc_pages()
arena_alloc_pages() accepts a plain int node_id and forwards it through the entire allocation chain without any bounds checking.
Validate node_id before passing it down the allocation chain in arena_alloc_pages().
AnalysisAI
Memory corruption in the Linux kernel BPF arena subsystem (versions 6.9 through pre-patch 7.1) arises because arena_alloc_pages() accepts an attacker-controlled NUMA node_id as a plain int and forwards it through the entire page-allocation chain without bounds validation. A local user able to load BPF programs and invoke the bpf_arena_alloc_pages helper can supply an out-of-range node_id, leading to out-of-bounds access into per-node allocator structures with potential information disclosure, corruption, or denial of service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access and the capability to load BPF programs and invoke the bpf_arena_alloc_pages helper - in practice CAP_BPF/CAP_PERFMON (or CAP_SYS_ADMIN), or a system where unprivileged BPF is explicitly enabled (kernel.unprivileged_bpf_disabled=0). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a local, low-complexity attack requiring only low privileges and no user interaction, with high impact to confidentiality, integrity and availability - consistent with a kernel-memory bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user with permission to load BPF programs writes a BPF program that calls bpf_arena_alloc_pages() with a crafted out-of-range or negative node_id; the unvalidated value flows into the kernel's per-NUMA-node allocator, triggering out-of-bounds access that can leak kernel memory or crash the system. No public exploit is identified at time of analysis, and the attack requires local access plus BPF load capability, so it is not remotely triggerable. |
| Remediation | Vendor-released patch: upgrade to a fixed stable kernel - 6.12.91, 6.18.33, 7.0.10, or 7.1 (or your distribution's patched build incorporating commits 31d3b4b28e55..., e15900888c09..., fb66e20130f9..., or 2845989f2eba...). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify systems running Linux kernel versions 6.9 through 7.0 via 'uname -r' and confirm BPF subsystem status using 'cat /boot/config-* | grep CONFIG_BPF'; prioritize cloud/container hosts and systems permitting BPF program loads. …
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External POC / Exploit Code
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