ghsa-c35q-x63g-2qfh
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
coresight: Clear the connection field properly
coresight devices track their connections (output connections) and hold a reference to the fwnode. When a device goes away, we walk through the devices on the coresight bus and make sure that the references are dropped. This happens both ways: a) For all output connections from the device, drop the reference to the target device via coresight_release_platform_data()
b) Iterate over all the devices on the coresight bus and drop the reference to fwnode if this device is the target of the output connection, via coresight_remove_conns()->coresight_remove_match().
However, the coresight_remove_match() doesn't clear the fwnode field, after dropping the reference, this causes use-after-free and additional refcount drops on the fwnode.
e.g., if we have two devices, A and B, with a connection, A -> B. If we remove B first, B would clear the reference on B, from A via coresight_remove_match(). But when A is removed, it still has a connection with fwnode still pointing to B. Thus it tries to drops the reference in coresight_release_platform_data(), raising the bells like :
[ 91.990153] ------------[ cut here ]------------ [ 91.990163] refcount_t: addition on 0; use-after-free. [ 91.990212] WARNING: CPU: 0 PID: 461 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144 [ 91.990260] Modules linked in: coresight_funnel coresight_replicator coresight_etm4x(-) crct10dif_ce coresight ip_tables x_tables ipv6 [last unloaded: coresight_cpu_debug] [ 91.990398] CPU: 0 PID: 461 Comm: rmmod Tainted: G W T 5.19.0-rc2+ #53 [ 91.990418] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019 [ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 91.990454] pc : refcount_warn_saturate+0xa0/0x144 [ 91.990476] lr : refcount_warn_saturate+0xa0/0x144 [ 91.990496] sp : ffff80000c843640 [ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8 [ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8 [ 91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2 [ 91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40 [ 91.990708] x17: 0000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0 [ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375 [ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9 : ffff8000081aba28 [ 91.990854] x8 : 206e6f206e6f6974 x7 : 69646461203a745f x6 : 746e756f63666572 [ 91.990903] x5 : ffff00097648ec58 x4 : 0000000000000000 x3 : 0000000000000027 [ 91.990952] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080260ba00 [ 91.991000] Call trace: [ 91.991012] refcount_warn_saturate+0xa0/0x144 [ 91.991034] kobject_get+0xac/0xb0 [ 91.991055] of_node_get+0x2c/0x40 [ 91.991076] of_fwnode_get+0x40/0x60 [ 91.991094] fwnode_handle_get+0x3c/0x60 [ 91.991116] fwnode_get_nth_parent+0xf4/0x110 [ 91.991137] fwnode_full_name_string+0x48/0xc0 [ 91.991158] device_node_string+0x41c/0x530 [ 91.991178] pointer+0x320/0x3ec [ 91.991198] vsnprintf+0x23c/0x750 [ 91.991217] vprintk_store+0x104/0x4b0 [ 91.991238] vprintk_emit+0x8c/0x360 [ 91.991257] vprintk_default+0x44/0x50 [ 91.991276] vprintk+0xcc/0xf0 [ 91.991295] _printk+0x68/0x90 [ 91.991315] of_node_release+0x13c/0x14c [ 91.991334] kobject_put+0x98/0x114 [ 91.991354] of_node_put+0x24/0x34 [ 91.991372] of_fwnode_put+0x40/0x5c [ 91.991390] fwnode_handle_put+0x38/0x50 [ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight] [ 91.991472] coresight_unregister+0x64/0xcc [coresight] [ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x] [ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x] [ 91.991598] amba_remove+0x3c/0x19c ---truncated---
{
"affected": [],
"aliases": [
"CVE-2022-50214"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:52Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: Clear the connection field properly\n\ncoresight devices track their connections (output connections) and\nhold a reference to the fwnode. When a device goes away, we walk through\nthe devices on the coresight bus and make sure that the references\nare dropped. This happens both ways:\n a) For all output connections from the device, drop the reference to\n the target device via coresight_release_platform_data()\n\nb) Iterate over all the devices on the coresight bus and drop the\n reference to fwnode if *this* device is the target of the output\n connection, via coresight_remove_conns()-\u003ecoresight_remove_match().\n\nHowever, the coresight_remove_match() doesn\u0027t clear the fwnode field,\nafter dropping the reference, this causes use-after-free and\nadditional refcount drops on the fwnode.\n\ne.g., if we have two devices, A and B, with a connection, A -\u003e B.\nIf we remove B first, B would clear the reference on B, from A\nvia coresight_remove_match(). But when A is removed, it still has\na connection with fwnode still pointing to B. Thus it tries to drops\nthe reference in coresight_release_platform_data(), raising the bells\nlike :\n\n[ 91.990153] ------------[ cut here ]------------\n[ 91.990163] refcount_t: addition on 0; use-after-free.\n[ 91.990212] WARNING: CPU: 0 PID: 461 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144\n[ 91.990260] Modules linked in: coresight_funnel coresight_replicator coresight_etm4x(-)\n crct10dif_ce coresight ip_tables x_tables ipv6 [last unloaded: coresight_cpu_debug]\n[ 91.990398] CPU: 0 PID: 461 Comm: rmmod Tainted: G W T 5.19.0-rc2+ #53\n[ 91.990418] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019\n[ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 91.990454] pc : refcount_warn_saturate+0xa0/0x144\n[ 91.990476] lr : refcount_warn_saturate+0xa0/0x144\n[ 91.990496] sp : ffff80000c843640\n[ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8\n[ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8\n[ 91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2\n[ 91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40\n[ 91.990708] x17: 0000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0\n[ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375\n[ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9 : ffff8000081aba28\n[ 91.990854] x8 : 206e6f206e6f6974 x7 : 69646461203a745f x6 : 746e756f63666572\n[ 91.990903] x5 : ffff00097648ec58 x4 : 0000000000000000 x3 : 0000000000000027\n[ 91.990952] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080260ba00\n[ 91.991000] Call trace:\n[ 91.991012] refcount_warn_saturate+0xa0/0x144\n[ 91.991034] kobject_get+0xac/0xb0\n[ 91.991055] of_node_get+0x2c/0x40\n[ 91.991076] of_fwnode_get+0x40/0x60\n[ 91.991094] fwnode_handle_get+0x3c/0x60\n[ 91.991116] fwnode_get_nth_parent+0xf4/0x110\n[ 91.991137] fwnode_full_name_string+0x48/0xc0\n[ 91.991158] device_node_string+0x41c/0x530\n[ 91.991178] pointer+0x320/0x3ec\n[ 91.991198] vsnprintf+0x23c/0x750\n[ 91.991217] vprintk_store+0x104/0x4b0\n[ 91.991238] vprintk_emit+0x8c/0x360\n[ 91.991257] vprintk_default+0x44/0x50\n[ 91.991276] vprintk+0xcc/0xf0\n[ 91.991295] _printk+0x68/0x90\n[ 91.991315] of_node_release+0x13c/0x14c\n[ 91.991334] kobject_put+0x98/0x114\n[ 91.991354] of_node_put+0x24/0x34\n[ 91.991372] of_fwnode_put+0x40/0x5c\n[ 91.991390] fwnode_handle_put+0x38/0x50\n[ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight]\n[ 91.991472] coresight_unregister+0x64/0xcc [coresight]\n[ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x]\n[ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x]\n[ 91.991598] amba_remove+0x3c/0x19c\n---truncated---",
"id": "GHSA-c35q-x63g-2qfh",
"modified": "2025-06-18T12:30:56Z",
"published": "2025-06-18T12:30:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50214"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2af89ebacf299b7fba5f3087d35e8a286ec33706"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/847b9273dd61567fb77617eabc5fa002594db062"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b49b29ee113a87997bcca0bb0585bb46582846c1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bc57850fcb7e4cb91b6321d0ce83357cefd55c54"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d43e967963c4d1b2b49f894d2f1b12865f87b098"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e9205d8dd1cafb7cff689ef9ddf06276a68f54a4"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.