GHSA-W9JF-HMJ5-FP54
Vulnerability from github – Published: 2025-02-27 18:31 – Updated: 2025-02-27 18:31In the Linux kernel, the following vulnerability has been resolved:
macsec: fix UAF bug for real_dev
Create a new macsec device but not get reference to real_dev. That can not ensure that real_dev is freed after macsec. That will trigger the UAF bug for real_dev as following:
================================================================== BUG: KASAN: use-after-free in macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662 Call Trace: ... macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662 dev_get_iflink+0x73/0xe0 net/core/dev.c:637 default_operstate net/core/link_watch.c:42 [inline] rfc2863_policy+0x233/0x2d0 net/core/link_watch.c:54 linkwatch_do_dev+0x2a/0x150 net/core/link_watch.c:161
Allocated by task 22209: ... alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10549 rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3235 veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748
Freed by task 8: ... kfree+0xd6/0x4d0 mm/slub.c:4552 kvfree+0x42/0x50 mm/util.c:615 device_release+0x9f/0x240 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10327
After commit faab39f63c1f ("net: allow out-of-order netdev unregistration") and commit e5f80fcf869a ("ipv6: give an IPv6 dev to blackhole_netdev"), we can add dev_hold_track() in macsec_dev_init() and dev_put_track() in macsec_free_netdev() to fix the problem.
{
"affected": [],
"aliases": [
"CVE-2022-49390"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:15Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: fix UAF bug for real_dev\n\nCreate a new macsec device but not get reference to real_dev. That can\nnot ensure that real_dev is freed after macsec. That will trigger the\nUAF bug for real_dev as following:\n\n==================================================================\nBUG: KASAN: use-after-free in macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662\nCall Trace:\n ...\n macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662\n dev_get_iflink+0x73/0xe0 net/core/dev.c:637\n default_operstate net/core/link_watch.c:42 [inline]\n rfc2863_policy+0x233/0x2d0 net/core/link_watch.c:54\n linkwatch_do_dev+0x2a/0x150 net/core/link_watch.c:161\n\nAllocated by task 22209:\n ...\n alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10549\n rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3235\n veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748\n\nFreed by task 8:\n ...\n kfree+0xd6/0x4d0 mm/slub.c:4552\n kvfree+0x42/0x50 mm/util.c:615\n device_release+0x9f/0x240 drivers/base/core.c:2229\n kobject_cleanup lib/kobject.c:673 [inline]\n kobject_release lib/kobject.c:704 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1c8/0x540 lib/kobject.c:721\n netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10327\n\nAfter commit faab39f63c1f (\"net: allow out-of-order netdev unregistration\")\nand commit e5f80fcf869a (\"ipv6: give an IPv6 dev to blackhole_netdev\"), we\ncan add dev_hold_track() in macsec_dev_init() and dev_put_track() in\nmacsec_free_netdev() to fix the problem.",
"id": "GHSA-w9jf-hmj5-fp54",
"modified": "2025-02-27T18:31:08Z",
"published": "2025-02-27T18:31:08Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49390"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/196a888ca6571deb344468e1d7138e3273206335"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/78933cbc143b82d02330e00900d2fd08f2682f4e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d130282179aa6051449ac8f8df1115769998a665"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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