Linux Kernel Open vSwitch Vulnerability Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-74701

Key Details

CVE	CVE-2026-74701
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-14
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Exploitation prediction (EPSS)	0.13% probability of exploitation in the next 30 days (2% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

net/openvswitch: check Ethernet header length in key_extract()

When a packet arrives on an ARPHRD_NONE device (e.g. TUN),

ovs_flow_key_extract() trusts the user-provided skb->protocol field: if

it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and

key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes

of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes

for MAC addresses and parse_ethertype() pulls 2 more, either of which

triggers a kernel BUG in __skb_pull() when the linear area is too small.

kernel BUG at include/linux/skbuff.h:2848!

RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933

ovs_flow_key_extract+0x419/0xa70

ovs_vport_receive+0x222/0x390

netdev_frame_hook+0x3e0/0x630

tun_get_user+0x2d0c/0x38e0

Fixed by calling check_header() in key_extract() before accessing the

Ethernet header. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74701
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74701

Source

Reference

NVD

CVE