CVE-2022-48759
rpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev
- Published
- Updated
- Reserved
- Assigned by
- Linux
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().
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (7 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 7.8.
Weakness
Affected products
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < 74d85e9fbc7022a4011102c7474a9c7aeb704a35
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < 70cb4295ec806b663665e1d2ed15caab6159880e
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < da27b834c1e0222e149e06caddf7718478086d1b
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < 1dbb206730f3e5ce90014ad569ddf8167ec4124a
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < 85aba11a8ea92a8eef2de95ebbe063086fd62d9c
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < d6cdc6ae542845d4d0ac8b6d99362bde7042a3c7
- affected c0cdc19f84a4712cf74888f83af286e3c2e14efd – < b7fb2dad571d1e21173c06cef0bced77b323990a
- affected 4.11
- unaffected < 4.11
- unaffected 4.14.265 – ≤ 4.14.*
- unaffected 4.19.228 – ≤ 4.19.*
- unaffected 5.4.176 – ≤ 5.4.*
- unaffected 5.10.96 – ≤ 5.10.*
- unaffected 5.15.19 – ≤ 5.15.*
- unaffected 5.16.5 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References (7)
- https://git.kernel.org/stable/c/74d85e9fbc7022a4011102c7474a9c7aeb704a35 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/70cb4295ec806b663665e1d2ed15caab6159880e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/da27b834c1e0222e149e06caddf7718478086d1b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/1dbb206730f3e5ce90014ad569ddf8167ec4124a (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/85aba11a8ea92a8eef2de95ebbe063086fd62d9c (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d6cdc6ae542845d4d0ac8b6d99362bde7042a3c7 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/b7fb2dad571d1e21173c06cef0bced77b323990a (opens in a new tab)x_transferred
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)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-48759)Record last updated .