CVE-2022-49958 (GCVE-0-2022-49958)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-05-11 19:09
VLAI
Title
net/sched: fix netdevice reference leaks in attach_default_qdiscs()
Summary
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->qdisc 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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bf6dba76d278d296b385b436d3ac7de56c190d44 , < 44dfa645895a56f65461249deb5b81cd16560e2a (git)
Affected: bf6dba76d278d296b385b436d3ac7de56c190d44 , < a420d587260185407eda9c5766cfa9bdd5c39a56 (git)
Affected: bf6dba76d278d296b385b436d3ac7de56c190d44 , < 0c6c522857151ac00150fd01baeebf231fb7d142 (git)
Affected: bf6dba76d278d296b385b436d3ac7de56c190d44 , < f612466ebecb12a00d9152344ddda6f6345f04dc (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.142 , ≤ 5.10.* (semver)
Unaffected: 5.15.66 , ≤ 5.15.* (semver)
Unaffected: 5.19.8 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: corrige fugas de referencia de netdevice en attached_default_qdiscs() En attached_default_qdiscs(), si un dev tiene varias colas y la cola 0 no puede adjuntar qdisc porque no hay memoria en attached_one_default_qdisc(). Entonces dev-\u0026gt;qdisc ser\u00e1 noop_qdisc por defecto. Pero las otras colas pueden ser capaces de adjuntar con \u00e9xito a la qdisc predeterminada. En este caso, se activar\u00e1 el proceso de retorno a noqueue. Si la qdisc adjunta original no se libera y se adjunta una nueva directamente, esto causar\u00e1 fugas de referencia de netdevice. El siguiente es el registro de errores: veth0: falla de qdisc predeterminada (fq_codel), retorno a noqueue unregister_netdevice: esperando a que veth0 se libere. Recuento de uso = 32 referencias filtradas. 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 Corrija este error borrando cualquier qdisc que no sea noop que pueda haberse asignado antes de intentar volver a conectar."
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        "id": "CVE-2022-49958",
        "lastModified": "2026-06-17T05:19:37.450",
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                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:33:45+00:00",
      "cve": "CVE-2022-49958",
      "id": "CVE-2022-49958",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "321",
      "product_status:known_affected": "38",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: fix netdevice reference leaks in attach_default_qdiscs()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49958.json",
      "version": "3"
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}



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