What’s Vulnerable › Vulnerabilities

CVE-2026-97408: Bluetooth: L2CAP: validate connectionless PSM length

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-03

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate connectionless PSM length Connectionless L2CAP frames carry a two-byte PSM at the start of the payload. l2cap_recv_frame() currently reads that PSM unconditionally after validating only the outer L2CAP length. A malformed connectionless frame with a zero- or one-byte payload can therefore make the parser read beyond the advertised skb payload and use tailroom bytes as part of the PSM. A VHCI-backed QEMU reproducer injected a one-byte connectionless payload and reached the unchecked read. Reject connectionless frames that cannot contain the PSM before reading or pulling it. This preserves all valid connectionless frames while dropping only structurally incomplete packets.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/22fc1ce4e37c81d4e7aac01566ebdc232214540d
• https://git.kernel.org/stable/c/3502ede8aed3c3ee1786d952a11054ac737d1a38
• https://git.kernel.org/stable/c/72e26293a231f63a856340d3a1f0f5fc29bf87e5
• https://git.kernel.org/stable/c/8104cd9859b6de0826cffa68adf2c1461185823b
• https://git.kernel.org/stable/c/9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982
• https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0
• https://git.kernel.org/stable/c/ae69dca122f6d6046a68cf40153e6e827c77ff5c

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