# CVE-2022-48857: linux: In the Linux kernel, the following vulnerability has been resolved:  NFC: port100: fix use-after-free in port100_send...

CVE-2022-48857 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48857, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48857
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  NFC: port100: fix use-after-free in port100_send_complete  Syzbot reported UAF in port100_send_complete(). The root case is in missing usb_kill_urb() calls on error handling path of ->probe function.  port100_send_complete() accesses devm allocated memory which will be freed on probe failure. We should kill this urbs before returning an error from probe function to prevent reported use-after-free  Fail log:  BUG: KASAN: use-after-free in port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935 Read of size 1 at addr ffff88801bb59540 by task ksoftirqd/2/26 ... Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106  print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255  __kasan_report mm/kasan/report.c:442 [inline]  kasan_report.cold+0x83/0xdf mm/kasan/report.c:459  port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935  __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1670  ...  Allocated by task 1255:  kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38  kasan_set_track mm/kasan/common.c:45 [inline]  set_alloc_info mm/kasan/common.c:436 [inline]  ____kasan_kmalloc mm/kasan/common.c:515 [inline]  ____kasan_kmalloc mm/kasan/common.c:474 [inline]  __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524  alloc_dr drivers/base/devres.c:116 [inline]  devm_kmalloc+0x96/0x1d0 drivers/base/devres.c:823  devm_kzalloc include/linux/device.h:209 [inline]  port100_probe+0x8a/0x1320 drivers/nfc/port100.c:1502  Freed by task 1255:  kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38  kasan_set_track+0x21/0x30 mm/kasan/common.c:45  kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370  ____kasan_slab_free mm/kasan/common.c:366 [inline]  ____kasan_slab_free+0xff/0x140 mm/kasan/common.c:328  kasan_slab_free include/linux/kasan.h:236 [inline]  __cache_free mm/slab.c:3437 [inline]  kfree+0xf8/0x2b0 mm/slab.c:3794  release_nodes+0x112/0x1a0 drivers/base/devres.c:501  devres_release_all+0x114/0x190 drivers/base/devres.c:530  really_probe+0x626/0xcc0 drivers/base/dd.c:670

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.18-1 | [DEBIAN-CVE-2022-48857](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48857.md) | Jul 16, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.18-1 | [DEBIAN-CVE-2022-48857](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48857.md) | Jul 16, 2024 |
| Linux | linux Debian 14 | 5.16.18-1 | [DEBIAN-CVE-2022-48857](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48857.md) | Jul 16, 2024 |

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