CVE-2026-53253Bluetooth: bnep: reject short frames before parsing

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 (?:?)

Timeline

Scores

EPSS (exploitation in 30 days)

0.27% · top 81% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

• Linux · Linux

  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0ef2ea86c82b2615902d085cd5a586fe9f58994f
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 2b83afb19293e4de700edae306115f18966dc4f9
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 691f14b6a48b637655755134f1e551c7c6fedc2e
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d76dec1a37122bc16d83d059c08c0512ea8de909
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c893e17d2809ec9c4b3f1cdd5847cecbc27a311b
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < be837cd09897e9e6e1958174501d467bdcbcc2bc
  • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6770d3a8acdf9151769180cc3710346c4cfbe6f0

• Linux · Linux

  • affected 2.6.12
  • unaffected < 2.6.12
  • unaffected 5.15.210 – ≤ 5.15.*
  • unaffected 6.1.176 – ≤ 6.1.*
  • unaffected 6.6.143 – ≤ 6.6.*
  • unaffected 6.12.94 – ≤ 6.12.*
  • unaffected 6.18.36 – ≤ 6.18.*
  • unaffected 7.0.13 – ≤ 7.0.*
  • unaffected 7.1 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-39204 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-53253](https://cveledger.app/badge/CVE-2026-53253.svg)](https://cveledger.app/cve/CVE-2026-53253)

Record last updated 19 Oct 2026, 19:57 UTC.