{"id":"DEBIAN-CVE-2022-49958","details":"In the Linux kernel, the following vulnerability has been resolved:  net/sched: fix netdevice reference leaks in attach_default_qdiscs()  In attach_default_qdiscs(), if a dev has multiple queues and queue 0 fails to attach qdisc because there is no memory in attach_one_default_qdisc(). Then dev-\u003eqdisc will be noop_qdisc by default. But the other queues may be able to successfully attach to default qdisc.  In this case, the fallback to noqueue process will be triggered. If the original attached qdisc is not released and a new one is directly attached, this will cause netdevice reference leaks.  The following is the bug log:  veth0: default qdisc (fq_codel) fail, fallback to noqueue unregister_netdevice: waiting for veth0 to become free. Usage count = 32 leaked reference.  qdisc_alloc+0x12e/0x210  qdisc_create_dflt+0x62/0x140  attach_one_default_qdisc.constprop.41+0x44/0x70  dev_activate+0x128/0x290  __dev_open+0x12a/0x190  __dev_change_flags+0x1a2/0x1f0  dev_change_flags+0x23/0x60  do_setlink+0x332/0x1150  __rtnl_newlink+0x52f/0x8e0  rtnl_newlink+0x43/0x70  rtnetlink_rcv_msg+0x140/0x3b0  netlink_rcv_skb+0x50/0x100  netlink_unicast+0x1bb/0x290  netlink_sendmsg+0x37c/0x4e0  sock_sendmsg+0x5f/0x70  ____sys_sendmsg+0x208/0x280  Fix this bug by clearing any non-noop qdiscs that may have been assigned before trying to re-attach.","modified":"2026-09-01T20:03:45.995563926Z","published":"2025-06-18T11:15:23.013Z","upstream":["CVE-2022-49958"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49958"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49958.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49958.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49958.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}