Answer in brief
CVE-2026-74508 records a Unknown severity vulnerability in Bluetooth: HIDP: reject frames without a transaction header. 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97b61241ab45bfa5b0526cb0f3978942493bc811 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ebf63aa557a69990b4e9ea22be224d58aabce96 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <854194494a6f726a60b90b76059148bf08df023d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47778d2c2087b5d192398f6fddf692d16a5431cf | 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec, 97b61241ab45bfa5b0526cb0f3978942493bc811, 2ebf63aa557a69990b4e9ea22be224d58aabce96, 854194494a6f726a60b90b76059148bf08df023d, 47778d2c2087b5d192398f6fddf692d16a5431cf |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom. KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one. The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds. Pull the transaction header with skb_pull_data() and discard frames that do not contain it.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74508 records a Unknown severity vulnerability in Bluetooth: HIDP: reject frames without a transaction header. 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97b61241ab45bfa5b0526cb0f3978942493bc811 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ebf63aa557a69990b4e9ea22be224d58aabce96 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <854194494a6f726a60b90b76059148bf08df023d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47778d2c2087b5d192398f6fddf692d16a5431cf | 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec, 97b61241ab45bfa5b0526cb0f3978942493bc811, 2ebf63aa557a69990b4e9ea22be224d58aabce96, 854194494a6f726a60b90b76059148bf08df023d, 47778d2c2087b5d192398f6fddf692d16a5431cf |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom. KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one. The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds. Pull the transaction header with skb_pull_data() and discard frames that do not contain it.
Quoted source text, attributed separately from HOL analysis.