CVE-2026-89743
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, nsm_sendrecv_msg_locked() stores the length reported by the NSM device without bounding it to the response buffer size. A malicious or buggy device can report an oversized length, leading to an out-of-bounds read and disclosure of adjacent kernel heap memory.
Risk Assessment
Kernel memory data may leak to user space, potentially exposing sensitive information and facilitating further attacks.
Recommendation
Update the Linux kernel to a version containing the fix that clamps the response length to the buffer size.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: misc: nsm: bound the device-reported response length nsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported by the NSM device into msg->resp.len without bounding it to the response buffer. A malicious or buggy backend can report a length larger than the response buffer; parse_resp_raw() then copies that many bytes out of the fixed buffer to user space, disclosing adjacent kernel heap (an out-of-bounds read). The request path already floors its length in fill_req_raw(); the response path lacks the symmetric check. Clamp the stored length to the size of the response buffer. Well-behaved devices report no more than the posted buffer size, so conforming traffic is unaffected.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS