# CVE-2022-49470: linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: btmtksdio: fix use-after-free at btmt...

CVE-2022-49470 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49470, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49470
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event  We should not access skb buffer data anymore after hci_recv_frame was called.  [   39.634809] BUG: KASAN: use-after-free in btmtksdio_recv_event+0x1b0 [   39.634855] Read of size 1 at addr ffffff80cf28a60d by task kworker [   39.634962] Call trace: [   39.634974]  dump_backtrace+0x0/0x3b8 [   39.634999]  show_stack+0x20/0x2c [   39.635016]  dump_stack_lvl+0x60/0x78 [   39.635040]  print_address_description+0x70/0x2f0 [   39.635062]  kasan_report+0x154/0x194 [   39.635079]  __asan_report_load1_noabort+0x44/0x50 [   39.635099]  btmtksdio_recv_event+0x1b0/0x1c4 [   39.635129]  btmtksdio_txrx_work+0x6cc/0xac4 [   39.635157]  process_one_work+0x560/0xc5c [   39.635177]  worker_thread+0x7ec/0xcc0 [   39.635195]  kthread+0x2d0/0x3d0 [   39.635215]  ret_from_fork+0x10/0x20 [   39.635247] Allocated by task 0: [   39.635260] (stack is not available) [   39.635281] Freed by task 2392: [   39.635295]  kasan_save_stack+0x38/0x68 [   39.635319]  kasan_set_track+0x28/0x3c [   39.635338]  kasan_set_free_info+0x28/0x4c [   39.635357]  ____kasan_slab_free+0x104/0x150 [   39.635374]  __kasan_slab_free+0x18/0x28 [   39.635391]  slab_free_freelist_hook+0x114/0x248 [   39.635410]  kfree+0xf8/0x2b4 [   39.635427]  skb_free_head+0x58/0x98 [   39.635447]  skb_release_data+0x2f4/0x410 [   39.635464]  skb_release_all+0x50/0x60 [   39.635481]  kfree_skb+0xc8/0x25c [   39.635498]  hci_event_packet+0x894/0xca4 [bluetooth] [   39.635721]  hci_rx_work+0x1c8/0x68c [bluetooth] [   39.635925]  process_one_work+0x560/0xc5c [   39.635951]  worker_thread+0x7ec/0xcc0 [   39.635970]  kthread+0x2d0/0x3d0 [   39.635990]  ret_from_fork+0x10/0x20 [   39.636021] The buggy address belongs to the object at ffffff80cf28a600                 which belongs to the cache kmalloc-512 of size 512 [   39.636039] The buggy address is located 13 bytes inside of                 512-byte region [ffffff80cf28a600, ffffff80cf28a800)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49470](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49470.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49470](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49470.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49470](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49470.md) | Feb 26, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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