# CVE-2022-48759: linux: In the Linux kernel, the following vulnerability has been resolved:  rpmsg: char: Fix race between the release of rpm...

CVE-2022-48759 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48759, released June 20, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48759
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 20, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  rpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev  struct rpmsg_ctrldev contains a struct cdev. The current code frees the rpmsg_ctrldev struct in rpmsg_ctrldev_release_device(), but the cdev is a managed object, therefore its release is not predictable and the rpmsg_ctrldev could be freed before the cdev is entirely released, as in the backtrace below.  [   93.625603] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x7c [   93.636115] WARNING: CPU: 0 PID: 12 at lib/debugobjects.c:488 debug_print_object+0x13c/0x1b0 [   93.644799] Modules linked in: veth xt_cgroup xt_MASQUERADE rfcomm algif_hash algif_skcipher af_alg uinput ip6table_nat fuse uvcvideo videobuf2_vmalloc venus_enc venus_dec videobuf2_dma_contig hci_uart btandroid btqca snd_soc_rt5682_i2c bluetooth qcom_spmi_temp_alarm snd_soc_rt5682v [   93.715175] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G    B             5.4.163-lockdep #26 [   93.723855] Hardware name: Google Lazor (rev3 - 8) with LTE (DT) [   93.730055] Workqueue: events kobject_delayed_cleanup [   93.735271] pstate: 60c00009 (nZCv daif +PAN +UAO) [   93.740216] pc : debug_print_object+0x13c/0x1b0 [   93.744890] lr : debug_print_object+0x13c/0x1b0 [   93.749555] sp : ffffffacf5bc7940 [   93.752978] x29: ffffffacf5bc7940 x28: dfffffd000000000 [   93.758448] x27: ffffffacdb11a800 x26: dfffffd000000000 [   93.763916] x25: ffffffd0734f856c x24: dfffffd000000000 [   93.769389] x23: 0000000000000000 x22: ffffffd0733c35b0 [   93.774860] x21: ffffffd0751994a0 x20: ffffffd075ec27c0 [   93.780338] x19: ffffffd075199100 x18: 00000000000276e0 [   93.785814] x17: 0000000000000000 x16: dfffffd000000000 [   93.791291] x15: ffffffffffffffff x14: 6e6968207473696c [   93.796768] x13: 0000000000000000 x12: ffffffd075e2b000 [   93.802244] x11: 0000000000000001 x10: 0000000000000000 [   93.807723] x9 : d13400dff1921900 x8 : d13400dff1921900 [   93.813200] x7 : 0000000000000000 x6 : 0000000000000000 [   93.818676] x5 : 0000000000000080 x4 : 0000000000000000 [   93.824152] x3 : ffffffd0732a0fa4 x2 : 0000000000000001 [   93.829628] x1 : ffffffacf5bc7580 x0 : 0000000000000061 [   93.835104] Call trace: [   93.837644]  debug_print_object+0x13c/0x1b0 [   93.841963]  __debug_check_no_obj_freed+0x25c/0x3c0 [   93.846987]  debug_check_no_obj_freed+0x18/0x20 [   93.851669]  slab_free_freelist_hook+0xbc/0x1e4 [   93.856346]  kfree+0xfc/0x2f4 [   93.859416]  rpmsg_ctrldev_release_device+0x78/0xb8 [   93.864445]  device_release+0x84/0x168 [   93.868310]  kobject_cleanup+0x12c/0x298 [   93.872356]  kobject_delayed_cleanup+0x10/0x18 [   93.876948]  process_one_work+0x578/0x92c [   93.881086]  worker_thread+0x804/0xcf8 [   93.884963]  kthread+0x2a8/0x314 [   93.888303]  ret_from_fork+0x10/0x18  The cdev_device_add/del() API was created to address this issue (see commit '233ed09d7fda ("chardev: add helper function to register char devs with a struct device")'), use it instead of cdev add/del().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.7-1 | [DEBIAN-CVE-2022-48759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48759.md) | Jun 20, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.7-1 | [DEBIAN-CVE-2022-48759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48759.md) | Jun 20, 2024 |
| Linux | linux Debian 14 | 5.16.7-1 | [DEBIAN-CVE-2022-48759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48759.md) | Jun 20, 2024 |

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