CVE-2026-74720
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.
CSIRTS triage
- What
- The eBPF verifier fails to preserve pointer state during commuted arithmetic operations, allowing pointer arithmetic bypass.
- Who is affected
- Systems running affected Linux kernel versions where unprivileged eBPF is enabled.
- Urgency
- Medium severity (CVSS 5.3); not currently exploited but enables privilege escalation vectors.
- Action
- Update to a patched Linux kernel version addressing CVE-2026-74720 or disable unprivileged eBPF.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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