Description (CNA)
In 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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2bce1ebed17da54c65042ec2b962e3234bad5b47 before 78933cbc143b82d02330e00900d2fd08f2682f4e; affected 2bce1ebed17da54c65042ec2b962e3234bad5b47 before d130282179aa6051449ac8f8df1115769998a665; affected 2bce1ebed17da54c65042ec2b962e3234bad5b47 before 196a888ca6571deb344468e1d7138e3273206335; affected 1861904a6092ed411203c6a02c75bfc45b27cc3c; affected 3a2675a2d97a68332fa5c33043038bfeb31455a8; affected b0add6db3d5ec4561cab257358871a9d3df7f0a3; affected 4.14.154 before 4.15; affected 4.19.84 before 4.20; affected 5.3.11 before 5.4 |
| Linux / Linux | affected 5.4; unaffected 0 before 5.4; unaffected 5.17.15 through 5.17.*; unaffected 5.18.3 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/78933cbc143b82d02330e00900d2fd08f2682f4e
- https://git.kernel.org/stable/c/d130282179aa6051449ac8f8df1115769998a665
- https://git.kernel.org/stable/c/196a888ca6571deb344468e1d7138e3273206335
ADP enrichment
No English description supplied.
No references supplied.