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vuln-cve/data/2022/48xxx/CVE-2022-48759.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2022-48759",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-06-20T11:09:39.059Z",
"datePublished": "2024-06-20T11:13:37.872Z",
"dateUpdated": "2026-08-05T08:52:09.934Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T08:52:09.934Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev\n\nstruct rpmsg_ctrldev contains a struct cdev. The current code frees\nthe rpmsg_ctrldev struct in rpmsg_ctrldev_release_device(), but the\ncdev is a managed object, therefore its release is not predictable\nand the rpmsg_ctrldev could be freed before the cdev is entirely\nreleased, as in the backtrace below.\n\n[ 93.625603] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x7c\n[ 93.636115] WARNING: CPU: 0 PID: 12 at lib/debugobjects.c:488 debug_print_object+0x13c/0x1b0\n[ 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\n[ 93.715175] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G B 5.4.163-lockdep #26\n[ 93.723855] Hardware name: Google Lazor (rev3 - 8) with LTE (DT)\n[ 93.730055] Workqueue: events kobject_delayed_cleanup\n[ 93.735271] pstate: 60c00009 (nZCv daif +PAN +UAO)\n[ 93.740216] pc : debug_print_object+0x13c/0x1b0\n[ 93.744890] lr : debug_print_object+0x13c/0x1b0\n[ 93.749555] sp : ffffffacf5bc7940\n[ 93.752978] x29: ffffffacf5bc7940 x28: dfffffd000000000\n[ 93.758448] x27: ffffffacdb11a800 x26: dfffffd000000000\n[ 93.763916] x25: ffffffd0734f856c x24: dfffffd000000000\n[ 93.769389] x23: 0000000000000000 x22: ffffffd0733c35b0\n[ 93.774860] x21: ffffffd0751994a0 x20: ffffffd075ec27c0\n[ 93.780338] x19: ffffffd075199100 x18: 00000000000276e0\n[ 93.785814] x17: 0000000000000000 x16: dfffffd000000000\n[ 93.791291] x15: ffffffffffffffff x14: 6e6968207473696c\n[ 93.796768] x13: 0000000000000000 x12: ffffffd075e2b000\n[ 93.802244] x11: 0000000000000001 x10: 0000000000000000\n[ 93.807723] x9 : d13400dff1921900 x8 : d13400dff1921900\n[ 93.813200] x7 : 0000000000000000 x6 : 0000000000000000\n[ 93.818676] x5 : 0000000000000080 x4 : 0000000000000000\n[ 93.824152] x3 : ffffffd0732a0fa4 x2 : 0000000000000001\n[ 93.829628] x1 : ffffffacf5bc7580 x0 : 0000000000000061\n[ 93.835104] Call trace:\n[ 93.837644] debug_print_object+0x13c/0x1b0\n[ 93.841963] __debug_check_no_obj_freed+0x25c/0x3c0\n[ 93.846987] debug_check_no_obj_freed+0x18/0x20\n[ 93.851669] slab_free_freelist_hook+0xbc/0x1e4\n[ 93.856346] kfree+0xfc/0x2f4\n[ 93.859416] rpmsg_ctrldev_release_device+0x78/0xb8\n[ 93.864445] device_release+0x84/0x168\n[ 93.868310] kobject_cleanup+0x12c/0x298\n[ 93.872356] kobject_delayed_cleanup+0x10/0x18\n[ 93.876948] process_one_work+0x578/0x92c\n[ 93.881086] worker_thread+0x804/0xcf8\n[ 93.884963] kthread+0x2a8/0x314\n[ 93.888303] ret_from_fork+0x10/0x18\n\nThe cdev_device_add/del() API was created to address this issue (see\ncommit '233ed09d7fda (\"chardev: add helper function to register char\ndevs with a struct device\")'), use it instead of cdev add/del()."
}
],
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{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
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{
"lang": "en",
"value": "AV:L - Exploitation requires opening the local /dev/rpmsg_ctrl* character device and racing its teardown; the rpmsg char path is not reachable from network packet processing.\nAC:L - An attacker who can open the ctrl device controls one side of the race and can drive the other by stopping the parent remoteproc (sysfs state) or inducing remote-processor restart/SSR while the fd remains open, so success does not depend on conditions outside attacker influence.\nPR:L - The driver performs no capability checks; access is only gated by device-node DAC, and on typical Android/ChromeOS/OpenAMP deployments udev grants /dev/rpmsg_ctrl* to non-root groups or service UIDs, so a basic local user/service suffices.\nUI:N - No victim action is required; the attacker opens the device and triggers teardown themselves.\nS:U - This is a host-kernel use-after-free in the rpmsg char driver that escalates within the same OS security authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - The bug frees struct rpmsg_ctrldev (including its embedded cdev) while the cdev lifetime can still be active, yielding a kernel UAF that can be reclaimed/sprayed for arbitrary read primitives.\nI:H - The same UAF leaves open/ioctl paths referencing freed ctrldev state, enabling heap reuse and control-flow hijacking / arbitrary write primitives.\nA:H - Freeing the object while a cdev/timer is still active causes kernel warnings/oops and can panic the system, as shown by the reported ODEBUG/kfree backtrace."
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