CVE-2026-53253
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: reject short frames before parsing A BNEP peer can send a short BNEP SDU. bnep_rx_frame() reads the packet type byte immediately and, for control packets, reads the control opcode and setup UUID-size byte before proving that those bytes are present. bnep_rx_control() also dereferences the control opcode without rejecting an empty control payload. Use skb_pull_data() for the fixed fields in bnep_rx_frame() so a NULL return gates each dereference. Split the control handler so the frame path can pass an opcode that has already been pulled, and keep the byte-buffer wrapper for extension control payloads. For BNEP_SETUP_CONN_REQ, name the UUID-size byte before pulling the setup payload. struct bnep_setup_conn_req carries destination and source service UUIDs after that byte, each uuid_size bytes, so the parser now documents that tuple explicitly instead of leaving the pull length as an opaque multiplication. Validation reproduced this kernel report: KASAN slab-out-of-bounds in bnep_rx_frame.isra.0+0x130c/0x1790 The buggy address belongs to the object at ffff88800c0f7908 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 1-byte region [ffff88800c0f7908, ffff88800c0f7909) Read of size 1 Call trace: dump_stack_lvl+0xb3/0x140 (?:?) print_address_description+0x57/0x3a0 (?:?) bnep_rx_frame+0x130c/0x1790 (net/bluetooth/bnep/core.c:306) print_report+0xb9/0x2b0 (?:?) __virt_addr_valid+0x1ba/0x3a0 (?:?) srso_alias_return_thunk+0x5/0xfbef5 (?:?) kasan_addr_to_slab+0x21/0x60 (?:?) kasan_report+0xe0/0x110 (?:?) process_one_work+0xfce/0x17e0 (kernel/workqueue.c:3200) worker_thread+0x65c/0xe40 (?:?) __kthread_parkme+0x184/0x230 (?:?) kthread+0x35e/0x470 (?:?) _raw_spin_unlock_irq+0x28/0x50 (?:?) ret_from_fork+0x586/0x870 (?:?) __switch_to+0x74f/0xdc0 (?:?) ret_from_fork_asm+0x1a/0x30 (?:?)
Severity
HIGH
CVSS score
7.1
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-25 09:16:43.253000
Last modified
2026-10-19 20:19:12.460000
View original CVE JSON
{
"id": "CVE-2026-53253",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-25T09:16:43.253",
"lastModified": "2026-10-19T20:19:12.460",
"vulnStatus": "Modified",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: reject short frames before parsing\n\nA BNEP peer can send a short BNEP SDU. bnep_rx_frame() reads the\npacket type byte immediately and, for control packets, reads the control\nopcode and setup UUID-size byte before proving that those bytes are\npresent. bnep_rx_control() also dereferences the control opcode without\nrejecting an empty control payload.\n\nUse skb_pull_data() for the fixed fields in bnep_rx_frame() so a NULL\nreturn gates each dereference. Split the control handler so the frame\npath can pass an opcode that has already been pulled, and keep the\nbyte-buffer wrapper for extension control payloads.\n\nFor BNEP_SETUP_CONN_REQ, name the UUID-size byte before pulling the\nsetup payload. struct bnep_setup_conn_req carries destination and source\nservice UUIDs after that byte, each uuid_size bytes, so the parser now\ndocuments that tuple explicitly instead of leaving the pull length as an\nopaque multiplication.\n\nValidation reproduced this kernel report:\nKASAN slab-out-of-bounds in bnep_rx_frame.isra.0+0x130c/0x1790\nThe buggy address belongs to the object at ffff88800c0f7908 which belongs\nto the cache kmalloc-8 of size 8\nThe buggy address is located 0 bytes to the right of allocated 1-byte\nregion [ffff88800c0f7908, ffff88800c0f7909)\nRead of size 1\nCall trace:\n dump_stack_lvl+0xb3/0x140 (?:?)\n print_address_description+0x57/0x3a0 (?:?)\n bnep_rx_frame+0x130c/0x1790 (net/bluetooth/bnep/core.c:306)\n print_report+0xb9/0x2b0 (?:?)\n __virt_addr_valid+0x1ba/0x3a0 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n kasan_addr_to_slab+0x21/0x60 (?:?)\n kasan_report+0xe0/0x110 (?:?)\n process_one_work+0xfce/0x17e0 (kernel/workqueue.c:3200)\n worker_thread+0x65c/0xe40 (?:?)\n __kthread_parkme+0x184/0x230 (?:?)\n kthread+0x35e/0x470 (?:?)\n _raw_spin_unlock_irq+0x28/0x50 (?:?)\n ret_from_fork+0x586/0x870 (?:?)\n __switch_to+0x74f/0xdc0 (?:?)\n ret_from_fork_asm+0x1a/0x30 (?:?)"
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