{"id":"AZL-96473","summary":"CVE-2026-74508 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: reject frames without a transaction header\n\nhidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb-\u003edata[0]\nbefore checking that the L2CAP SDU contains a transaction header. A\nconnected HIDP peer can send an empty basic-mode SDU and make both paths\nuse an uninitialized byte from skb tailroom.\n\nKMSAN reports the use in hidp_session_run(), with the uninitialized value\noriginating in __alloc_skb() through vhci_write(). The control path\nproduces two reports and the interrupt path produces one.\n\nThe byte can also be controlled by a malformed lower-layer packet. If an\nHCI ACL packet contains an L2CAP PDU with a declared zero-length payload\nfollowed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb-\u003elen to\nthe declared PDU length before dispatch. The current HIDP path nevertheless\nconsumes the extra byte as HIDP_TRANS_HID_CONTROL |\nHIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this\nchange, the same packet is discarded and a subsequent feature report\nrequest succeeds.\n\nPull the transaction header with skb_pull_data() and discard frames that\ndo not contain it.","modified":"2026-08-30T05:26:50Z","published":"2026-08-15T13:17:55Z","upstream":["CVE-2026-74508"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74508"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96473.json"}}],"schema_version":"1.9.0"}