Answer in brief
CVE-2026-98457 records a Unknown severity vulnerability in Bluetooth: L2CAP: validate frame length before control and FCS 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.
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.
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 | >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <4373ba79a267947e771c438507f7b103e30bdb21 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <965bd88ed4b4763cb765dd65885adcfa588c6b14 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <8c7556c7cd17e073bbefdc4a9a4694a207544c37 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <1fdbb2a712a9a162ee817c959740face80b3d929 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <c6a288e6001bcce16553c3853e0f5a45eaaf85c7 || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <f557274af7b94b6134692e6f26b880f1e34c15bf || >=1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a <6c78a213d9070b610c7f418af2c25b66180b7e37 | 4373ba79a267947e771c438507f7b103e30bdb21, 965bd88ed4b4763cb765dd65885adcfa588c6b14, 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70, 8c7556c7cd17e073bbefdc4a9a4694a207544c37, 1fdbb2a712a9a162ee817c959740face80b3d929, c6a288e6001bcce16553c3853e0f5a45eaaf85c7, f557274af7b94b6134692e6f26b880f1e34c15bf, 6c78a213d9070b610c7f418af2c25b66180b7e37 |
| Linux/Linuxgeneric | 2.6.32 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate frame length before control and FCS access l2cap_data_rcv() unpacks either a two-byte or four-byte control field without first ensuring that it is present. A short ERTM or streaming-mode frame can therefore cause an out-of-bounds read. There is a second short-frame case when CRC16 is enabled. After the control field is pulled, l2cap_check_fcs() subtracts two from skb->len without checking it. If fewer than two bytes remain, the subtraction wraps; skb_trim() leaves the buffer unchanged and the subsequent FCS load reads past the logical end of the frame. Validate that the frame contains both its control field and, when enabled, its FCS before either field is accessed.
Quoted source text, attributed separately from HOL analysis.