{"id":"CVE-2026-74508","title":"Bluetooth: HIDP: reject frames without a transaction header","summary":"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->data[0]\nbefore checking that the L2CAP SDU cont…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 238c333bc4b3f245c626632e8bfa3c9dab97f51b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 97b61241ab45bfa5b0526cb0f3978942493bc811","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ebf63aa557a69990b4e9ea22be224d58aabce96","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 854194494a6f726a60b90b76059148bf08df023d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47778d2c2087b5d192398f6fddf692d16a5431cf","Linux 2.6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:58:35.164112Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:51.205Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74508","references":[{"url":"https://git.kernel.org/stable/c/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8"},{"url":"https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b"},{"url":"https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7"},{"url":"https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec"},{"url":"https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811"},{"url":"https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96"},{"url":"https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d"},{"url":"https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf"}],"tags":["cve.org"],"epss":0.00262,"epssPercentile":0.16839,"ingestedAt":"2026-10-16T19:46:24.354Z","slug":"CVE-2026-74508","body":"## Overview\n\nIn 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->data[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->len 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.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 238c333bc4b3f245c626632e8bfa3c9dab97f51b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 97b61241ab45bfa5b0526cb0f3978942493bc811`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ebf63aa557a69990b4e9ea22be224d58aabce96`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 854194494a6f726a60b90b76059148bf08df023d`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47778d2c2087b5d192398f6fddf692d16a5431cf`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}