{"apiVersion":"1.0","identifier":"CVE-2026-74508","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.","publishedAt":"2026-08-15T13:17:55","lastModifiedAt":"2026-08-23T13:16:44","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74508","cvssScore":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00262,"riskScore":0.9,"affectedProduct":"linux","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74508","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74508","en":"https://www.redsauce.net/en/cves/CVE-2026-74508","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74508","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74508","de":"https://www.redsauce.net/de/cves/CVE-2026-74508","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74508","el":"https://www.redsauce.net/el/cves/CVE-2026-74508"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74508"}}