Bluetooth: L2CAP: validate connectionless PSM length (CVE-2026-97408) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97408

Bluetooth: L2CAP: validate connectionless PSM length

Answer in brief

CVE-2026-97408 records a Unknown severity vulnerability in Bluetooth: L2CAP: validate connectionless PSM length. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3502ede8aed3c3ee1786d952a11054ac737d1a38 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae69dca122f6d6046a68cf40153e6e827c77ff5c \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a40a5f922546b3bd7c094d882b29177db4f2abe0 \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	3502ede8aed3c3ee1786d952a11054ac737d1a38, ae69dca122f6d6046a68cf40153e6e827c77ff5c, a40a5f922546b3bd7c094d882b29177db4f2abe0, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 3502ede8aed3c3ee1786d952a11054ac737d1a38 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.