Описание
In the Linux kernel, the following vulnerability has been resolved:
wifi: cfg80211: check IP header size in cfg80211_classify8021d()
A frame that looks like IP can be transmitted, but be too short, so
the DS field is read incorrectly:
BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027
cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027
ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180
__ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304
ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538
...
packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108
Use skb_header_pointer() like the MPLS case.
A flaw was found in the Linux kernel's cfg80211 wireless subsystem. A local attacker can cause a Denial of Service (DoS) by transmitting crafted network frames that appear to be Internet Protocol (IP) traffic. Because the kernel fails to verify that the frame is large enough to hold a complete header before reading traffic priority fields, it reads uninitialized memory, potentially crashing the system.
Отчет
A low-impact flaw was found in the Linux kernel's cfg80211 wireless subsystem in the cfg80211_classify8021d() function. When a locally transmitted frame claims to be IPv4 or IPv6 traffic but is shorter than the corresponding IP header, the function reads the DSCP field from uninitialized memory while classifying the frame for 802.1d queue selection, as reported by KMSAN. A local attacker who can transmit crafted frames, which requires local privileges such as CAP_NET_RAW or an equivalent capability needed to send raw packets, could use this flaw to cause a denial of service by crashing the kernel. The uninitialized value is only consumed internally for queue selection, so it is not disclosed to user space and cannot be used for privilege escalation or data modification. Although the Red Hat CVSS 3.1 score of 5.5 (Moderate, AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) reflects high availability impact, Red Hat rates the overall security impact of this flaw as Low, because the uninitialized value only influences internal traffic classification and a kernel panic is not the expected outcome on standard configurations. The Red Hat Enterprise Linux 6 ELS stream is recorded as out of support scope for this flaw. For the affected Red Hat Enterprise Linux, Red Hat In-Vehicle OS, and OpenShift Container Platform (RHEL CoreOS) streams, the fix is deferred: due to the Low security impact, it will be addressed in a future planned kernel update rather than through an immediate update. The residual risk is limited to a local denial of service by an attacker who already holds the local privileges required to transmit raw frames.
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 | Out of support scope | ||
| 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 |
Показывать по
Дополнительная информация
Статус:
EPSS
5.5 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: check IP header size in cfg80211_classify8021d() A frame that looks like IP can be transmitted, but be too short, so the DS field is read incorrectly: BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 ... packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108 Use skb_header_pointer() like the MPLS case.
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: check IP header size in cfg80211_classify8021d() A frame that looks like IP can be transmitted, but be too short, so the DS field is read incorrectly: BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 ... packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108 Use skb_header_pointer() like the MPLS case.
wifi: cfg80211: check IP header size in cfg80211_classify8021d()
In the Linux kernel, the following vulnerability has been resolved: w ...
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: check IP header size in cfg80211_classify8021d() A frame that looks like IP can be transmitted, but be too short, so the DS field is read incorrectly: BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 ... packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108 Use skb_header_pointer() like the MPLS case.
EPSS
5.5 Medium
CVSS3