EUVD-2026-64407
GHSA-6hg3-qqfj-f5ww
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only BPF exploitation requires at minimum low-privilege or BPF-capable user; successful verifier bypass yields full kernel memory read/write (C:H/I:H/A:H); no scope change as impact remains within the exploited system.
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: Preserve pointer state for commuted arithmetic
When scalar += pointer is handled in adjust_ptr_min_max_vals(), the destination register inherits the pointer state from the source pointer. Copying only selected fields is fragile because pointer provenance is tracked by several bpf_reg_state fields.
Use the caller's temporary offset register to preserve the scalar operand while replacing the destination with the full pointer state. This preserves the frame number for PTR_TO_STACK registers and keeps parent identity fields consistent.
AnalysisAI
Privilege escalation in the Linux kernel BPF verifier affects versions from 4.16 through current stable branches due to incomplete pointer state propagation during commuted arithmetic (scalar += pointer) in adjust_ptr_min_max_vals(). Local attackers with BPF program loading privileges can exploit the verifier's failure to copy the full bpf_reg_state structure, potentially bypassing memory safety enforcement and achieving arbitrary kernel memory access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the target system with a user account that can invoke the bpf() syscall - specifically, either CAP_BPF or CAP_NET_ADMIN capability, or an environment where kernel.unprivileged_bpf_disabled=0 permits unprivileged BPF program loading. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 with vector AV:L/AC:L/PR:L/UI:N accurately reflects the exploitation profile: local access is required, complexity is low once privileges are obtained, and the impact is high across all three CIA dimensions via potential arbitrary kernel memory read and write. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local attacker with a low-privilege account on an affected Linux host crafts a malicious BPF program that performs scalar += pointer arithmetic in a pattern that triggers the incomplete state copy in adjust_ptr_min_max_vals(), causing the verifier to accept a program it should reject. Once the program is loaded, the attacker leverages the resulting type confusion to perform out-of-bounds kernel memory reads or writes, ultimately escalating privileges to root. … |
| Remediation | The definitive fix is upgrading to a patched Linux kernel version: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, or 7.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Linux systems running kernel versions 4.16 through current stable branches and identify those that expose BPF program loading to untrusted users or containers. …
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External POC / Exploit Code
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