CVE-2026-74508
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b
- https://git.kernel.org/stable/c/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8
- https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96
- https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec
- https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf
- https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7
- https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d
- https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.