Описание
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: vlan: fix bugs caused by switchdev deletion errors
Allowing switchdev to prevent vlan deletion and error out in __vlan_del
could cause multiple different issues - inconsistent state, memory leaks
when flushing, NULL pointer dereference on bridge error when flushing.
It doesn't make sense to allow it to stop __vlan_del, so log the error
and continue with software vlan deletion. This is also consistent with
8021q behaviour.
A flaw was found in the Linux kernel's network bridge component. When removing Virtual Local Area Network (VLAN) configurations, errors returned by hardware offload devices prevent the kernel from completing software cleanup. A local user could exploit this vulnerability to trigger memory leaks or a null pointer dereference, leading to a system crash and a Denial of Service (DoS).
Отчет
A flaw of low impact was found in the Linux kernel's network bridge VLAN subsystem, affecting the Red Hat Enterprise Linux kernel and kernel-rt packages, the Red Hat In-Vehicle OS kernels, and the Red Hat CoreOS kernel builds shipped with OpenShift Container Platform. When a bridge VLAN is deleted, an error returned by a switchdev hardware offload device could abort the kernel's software VLAN cleanup in __vlan_del. This could leave the bridge VLAN state inconsistent, leak memory when VLANs are flushed, or cause a NULL pointer dereference on the bridge error path when flushing. A local user able to configure bridge VLANs (which requires CAP_NET_ADMIN) on a host whose bridge ports are offloaded to switchdev-capable hardware could use this to crash the kernel, resulting in a local denial of service. Red Hat Enterprise Linux 6 is not affected because the vulnerable code is not present in that release. Red Hat Product Security rates this issue Low impact because exploitation requires local privileged access and depends on a switchdev deletion error occurring, and the impact is limited to system availability. Because of this low impact, the fix is deferred to a future update of the affected products; the residual risk is a local, privilege-gated denial of service with no impact on confidentiality or integrity.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fix deferred | ||
| Red Hat Enterprise Linux 8 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
5.5 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: net: bridge: vlan: fix bugs caused by switchdev deletion errors Allowing switchdev to prevent vlan deletion and error out in __vlan_del could cause multiple different issues - inconsistent state, memory leaks when flushing, NULL pointer dereference on bridge error when flushing. It doesn't make sense to allow it to stop __vlan_del, so log the error and continue with software vlan deletion. This is also consistent with 8021q behaviour.
In the Linux kernel, the following vulnerability has been resolved: net: bridge: vlan: fix bugs caused by switchdev deletion errors Allowing switchdev to prevent vlan deletion and error out in __vlan_del could cause multiple different issues - inconsistent state, memory leaks when flushing, NULL pointer dereference on bridge error when flushing. It doesn't make sense to allow it to stop __vlan_del, so log the error and continue with software vlan deletion. This is also consistent with 8021q behaviour.
net: bridge: vlan: fix bugs caused by switchdev deletion errors
In the Linux kernel, the following vulnerability has been resolved: n ...
In the Linux kernel, the following vulnerability has been resolved: net: bridge: vlan: fix bugs caused by switchdev deletion errors Allowing switchdev to prevent vlan deletion and error out in __vlan_del could cause multiple different issues - inconsistent state, memory leaks when flushing, NULL pointer dereference on bridge error when flushing. It doesn't make sense to allow it to stop __vlan_del, so log the error and continue with software vlan deletion. This is also consistent with 8021q behaviour.
EPSS
5.5 Medium
CVSS3