CVE-2025-48990
CVE-2025-48990 is a high-severity vulnerability with a CVSS 4.0 base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.
Key facts
- Severity: High (CVSS 4.0 base score 8.6)
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-16632
- Weakness: CWE-122
- Published:
- Last modified:
Description
NeKernal is a free and open-source operating system stack. Version 0.0.2 has a 1-byte heap overflow in `rt_copy_memory`, which unconditionally wrote a null terminator at `dst[len]`. When `len` equals the size of the destination buffer (256 bytes), that extra `'\0'` write overruns the buffer by one byte. To avoid breaking existing callers or changing the public API, the patch in commit fb7b7f658327f659c6a6da1af151cb389c2ca4ee takes a minimal approach: it simply removes the overflow-causing line without adding bounds checks or altering the function signature.
Frequently asked questions
- What is CVE-2025-48990?
- NeKernal is a free and open-source operating system stack. Version 0.0.2 has a 1-byte heap overflow in `rt_copy_memory`, which unconditionally wrote a null terminator at `dst[len]`. When `len` equals the size of the destination buffer (256 bytes), that extra `'\0'` write overruns the buffer by one byte. To avoid breaking existing callers or changing the public API, the patch in commit fb7b7f658327f659c6a6da1af151cb389c2ca4ee takes a minimal approach: it simply removes the overflow-causing line without adding bounds checks or altering the function signature.
- How severe is CVE-2025-48990?
- CVE-2025-48990 has a CVSS 4.0 base score of 8.6, rated high severity.
- Is CVE-2025-48990 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-48990?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-48990 have an EU (EUVD) identifier?
- Yes. CVE-2025-48990 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16632.
- When was CVE-2025-48990 published?
- CVE-2025-48990 was published on 2025-06-02 and last updated on 2026-06-17.
References
- https://github.com/nekernel-org/nekernel/commit/fb7b7f658327f659c6a6da1af151cb389c2ca4ee
- https://github.com/nekernel-org/nekernel/security/advisories/GHSA-jvvh-fp57-2p32
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