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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-74701 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927 kernel.org
https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 kernel.org
https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466 kernel.org
https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 kernel.org
https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15 kernel.org
https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae kernel.org
https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290 kernel.org
https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-74701
NVD Published Date:
08/22/2026
NVD Last Modified:
08/22/2026
Source:
kernel.org