CVE-2025-40004
- Source
- https://cve.org/CVERecord?id=CVE-2025-40004
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40004.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-40004
- Downstream
- Published
- 2025-10-20T05:26:08.787Z
- Modified
- 2025-12-05T10:15:18.810767Z
- Summary
- net/9p: Fix buffer overflow in USB transport layer
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net/9p: Fix buffer overflow in USB transport layer
A buffer overflow vulnerability exists in the USB 9pfs transport layer where inconsistent size validation between packet header parsing and actual data copying allows a malicious USB host to overflow heap buffers.
The issue occurs because: - usb9pfsrxheader() validates only the declared size in packet header - usb9pfsrxcomplete() uses req->actual (actual received bytes) for memcpy
This allows an attacker to craft packets with small declared size (bypassing validation) but large actual payload (triggering overflow in memcpy).
Add validation in usb9pfsrxcomplete() to ensure req->actual does not exceed the buffer capacity before copying data.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40004.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c
- https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451
- https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40004.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-40004
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceda3be076dc174d9022a71a12554feb4c97b5c4d5cFixed0da18d49f874d444ad83c8a546fa33bfcf2f582cFixeddf8462f0fc045b4475dc494a5787a03c972ba2a2Fixedc04db81cd0288dfc68b7a0f7d09bd49b40bba451