UBUNTU-CVE-2025-40004
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: - usb9pfs_rx_header() validates only the declared size in packet header - usb9pfs_rx_complete() 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 usb9pfs_rx_complete() to ensure req->actual does not exceed the buffer capacity before copying data.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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5 explicit affected versions
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26 explicit affected versions
11 explicit affected versions
1 explicit affected versions
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16 explicit affected versions
3 explicit affected versions
7 explicit affected versions
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51 explicit affected versions
8 explicit affected versions
18 explicit affected versions
12 explicit affected versions
1 explicit affected versions
27 explicit affected versions
8 explicit affected versions
5 explicit affected versions
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10 explicit affected versions
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13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
12 explicit affected versions
9 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
9 explicit affected versions
11 explicit affected versions
6 explicit affected versions
7 explicit affected versions
4 explicit affected versions
1 explicit affected versions
13 explicit affected versions
43 explicit affected versions
6 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
6 explicit affected versions
11 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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: - usb9pfs_rx_header() validates only the declared size in packet header - usb9pfs_rx_complete() 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 usb9pfs_rx_complete() to ensure req->actual does not exceed the buffer capacity before copying data.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/c04db81cd0288dfc68b7a0f7d09bd49b40bba451
- https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c
- https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451
- https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2
- https://ubuntu.com/security/CVE-2025-40004
- https://ubuntu.com/security/notices/USN-8029-1
- https://ubuntu.com/security/notices/USN-8029-2
- https://ubuntu.com/security/notices/USN-8029-3
- https://ubuntu.com/security/notices/USN-8030-1
- https://ubuntu.com/security/notices/USN-8048-1
- https://www.cve.org/CVERecord?id=CVE-2025-40004