CVE-2025-48990
NeKernel has Heap Overflow in `rt_copy_memory`
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
NeKernel has Heap Overflow in `rt_copy_memory`
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.
- Record
CVE-2025-48990- CVSS 4.0
- 8.6 High
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2025-16632
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.
- Record
EUVD-2025-16632- CVSS 4.0
- 8.6 High
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-48990- CVSS 4.0
- 8.6 High
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-122
- Updated
- 2026-11-02
OSV
NeKernel has Heap Overflow in `rt_copy_memory`
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.
- Record
CVE-2025-48990- CVSS 4.0
- 8.6 High
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-122
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-48990 is a high vulnerability (CVSS 8.6) in Nekernel-org Nekernel, published June 2, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th percentile. No source names a fixed version.