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CVE-2026-74701— net/openvswitch: check Ethernet header length in key_extract()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： net/openvswitch: 在 中检查以太网头部长度 当数据包到达 类型的网络设备（例如 TUN 设备）时， 盲目信任用户提供的 字段。如果该字段值为 ，数据包会被分类为 ，并调用 ，但在此过程中并未确保 至少包含 （14 字节）的线性数据区。随后， 会无条件地抽取 字节以读取 MAC 地址，而 会再抽取 2 字节；当线性数据区不足时，上述任一操作都会触发 中的内核 BUG。 修复方法： 在 中访问以太网头部之前，调用 进行必要的头部长度检查。

CVSS 7.8 · High EPSS 0.13% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 217ac77a3c2524d999730b2a80b61fcc2d0f734a< e85278afd4890dd190ba3c7a1b1a712b801c9fe1 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< 831471718f6e19aed1a330b03b53190a90e06466 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< d8bea341b183190ce6c055ab0e64ab78eb9a7290 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< 0b60b55652ba772b173dddc63f3851e1d2dd5927 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< a8139285c8925efe59af28a9169bb2fda91bff15 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 affected
217ac77a3c2524d999730b2a80b61fcc2d0f734a< cf6f8b29befb92173659bcef6a441d274947bfae affected
… +10 more rows
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I. Basic Information for CVE-2026-74701

Vulnerability Information
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Vulnerability Title
net/openvswitch: check Ethernet header length in key_extract()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 217ac77a3c2524d999730b2a80b61fcc2d0f734a ~ e85278afd4890dd190ba3c7a1b1a712b801c9fe1 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-74701

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III. Intelligence Information for CVE-2026-74701

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Patches & Fixes for CVE-2026-74701 (7)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74701

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