CVE-2025-40301

Bluetooth: hci_event: validate skb length for unknown CC opcode

State: Published
Severity: 7.6 High
Published: Dec 8, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_event: validate skb length for unknown CC opcode

In hci_cmd_complete_evt(), if the command complete event has an unknown opcode, we assume the first byte of the remaining skb->data contains the return status. However, parameter data has previously been pulled in hci_event_func(), which may leave the skb empty. If so, using skb->data[0] for the return status uses un-init memory.

The fix is to check skb->len before using skb->data.

Scores

CVSS	Score	Vector	Source
3.1	7.6 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before fea895de78d3bb2f0c09db9f10b18f8121b15759Affected afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 779f83a91d4f1bf5ddfeaf528420cbb6dbf03fa8Affected afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before cf2c2acec1cf456c3d11c11a7589e886a0f963a9Affected afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 1a0ddaaf97405dbd11d4cb5a961a3f82400e8a50Affected afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 5c5f1f64681cc889d9b13e4a61285e9e029d6ab5Affected
LinuxLinux	6.1Affected before 6.1Not affected 6.1.159 through 6.1.Not affected 6.6.117 through 6.6.Not affected 6.12.58 through 6.12.Not affected 6.17.8 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before fea895de78d3bb2f0c09db9f10b18f8121b15759Affected
afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 779f83a91d4f1bf5ddfeaf528420cbb6dbf03fa8Affected
afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before cf2c2acec1cf456c3d11c11a7589e886a0f963a9Affected
afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 1a0ddaaf97405dbd11d4cb5a961a3f82400e8a50Affected
afcb3369f46ed5dc883a7b92f2dd1e264d79d388 to before 5c5f1f64681cc889d9b13e4a61285e9e029d6ab5Affected

LinuxLinux

6.1Affected
before 6.1Not affected
6.1.159 through 6.1.*Not affected
6.6.117 through 6.6.*Not affected
6.12.58 through 6.12.*Not affected
6.17.8 through 6.17.*Not affected
6.18 and laterNot affected

References

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