Answer in brief
CVE-2026-31393 records a High severity (CVSS 8.1) vulnerability in Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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.
CVSS is 8.1. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4e8402a3f884427f9233ba436459c158d1f2e114 <187e6fe939295be36063a1d91f8bebee04399a8c || >=4e8402a3f884427f9233ba436459c158d1f2e114 <5229e7d15771eac2b5886bfb1f976aea0c1eec14 || >=4e8402a3f884427f9233ba436459c158d1f2e114 <3b646516cba2ebc4b51a72954903326e7c1e443f || >=4e8402a3f884427f9233ba436459c158d1f2e114 <807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 || >=4e8402a3f884427f9233ba436459c158d1f2e114 <9aeacde4da0f02d42fd968fd32f245828b230171 || >=4e8402a3f884427f9233ba436459c158d1f2e114 <e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 || >=4e8402a3f884427f9233ba436459c158d1f2e114 <db2872d054e467810078e2b9f440a5b326a601b2 || >=4e8402a3f884427f9233ba436459c158d1f2e114 <dd815e6e3918dc75a49aaabac36e4f024d675101 | 187e6fe939295be36063a1d91f8bebee04399a8c, 5229e7d15771eac2b5886bfb1f976aea0c1eec14, 3b646516cba2ebc4b51a72954903326e7c1e443f, 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0, 9aeacde4da0f02d42fd968fd32f245828b230171, e7ff754e339e3d5ce29aa9f95352d0186df8fbd9, db2872d054e467810078e2b9f440a5b326a601b2, dd815e6e3918dc75a49aaabac36e4f024d675101 |
| Linux/Linuxgeneric | 2.6.24 | Not reported |
Published upstream
Apr 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.
Quoted source text, attributed separately from HOL analysis.