Bluetooth: L2CAP: validate connectionless PSM length
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 6 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-97408
- 2026-10-03 Alias added: GHSA-39rm-4xq5-hvr6
- 2026-10-03 Fix available: Linux/Linux@22fc1ce4e37c81d4e7aac01566ebdc232214540d, Linux/[email protected], Linux/[email protected] +5 · CNA
- 2026-10-03 4 new references · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/8104cd9859b6de0826cffa68adf2c1461185823b
- https://git.kernel.org/stable/c/9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982
- https://git.kernel.org/stable/c/22fc1ce4e37c81d4e7aac01566ebdc232214540d
- https://git.kernel.org/stable/c/72e26293a231f63a856340d3a1f0f5fc29bf87e5
- https://git.kernel.org/stable/c/3502ede8aed3c3ee1786d952a11054ac737d1a38
- https://git.kernel.org/stable/c/ae69dca122f6d6046a68cf40153e6e827c77ff5c
- https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0
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Sources
- CVE-2026-97408 · CVE Program
- CVE-2026-97408 · NVD
- FIRST EPSS
- GHSA-39rm-4xq5-hvr6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-97408 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences