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CVE-2026-74667— net/packet: reset the MAC header on the packet-socket transmit path

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.

以下是该漏洞描述信息的中文翻译： --- 在 Linux 内核中，以下漏洞已修复： net/packet: 重置数据包套接字传输路径上的 MAC 头信息 函数仅对未绑定协议的 SOCK_RAW 类型的帧重置 MAC 头信息。而对于已绑定协议的 SOCK_RAW 套接字、任何 SOCK_DGRAM 类型的帧以及传统的 SOCK_PACKET 路径，在此处均未设置 。 通过 发送的帧是无害的，因为它会无条件地重置 MAC 头。但是，packet-socket 的 路径使用 ，该函数不会重置 MAC 头，因此帧到达 时

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 75c65772c3d18447d62d3aca5f91b06c16cc25e4< 1e43a1d66615f411d427f9df1f46dd049d9e3681 affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< 4057853a91fb796c4f47c7d1baf1aa085394148e affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< 2610ed4e86a4590234a9d70518c469751c5af231 affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< b47ba8fe6e1d2df8c92048de5afafd059447dc30 affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< 284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< 971aa7d99242bbf09513e27b7a243f0b29ff23ae affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< fdd4d7d52358a58e351dd9d82530c04eba8ccd7a affected
75c65772c3d18447d62d3aca5f91b06c16cc25e4< c2707480cfbf19c7619acc9c089d17f20869821f affected
… +10 more rows
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I. Basic Information for CVE-2026-74667

Vulnerability Information
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Vulnerability Title
net/packet: reset the MAC header on the packet-socket transmit path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/packet: reset the MAC header on the packet-socket transmit path packet_parse_headers() resets the MAC header only for a SOCK_RAW frame whose socket did not bind a protocol. A protocol-bound SOCK_RAW socket, any SOCK_DGRAM frame, and the legacy SOCK_PACKET path therefore leave skb->mac_header unset here. For frames sent via __dev_queue_xmit() this is harmless: it resets the MAC header unconditionally. But the packet-socket PACKET_QDISC_BYPASS path uses dev_direct_xmit(), which does not, so the frame reaches ndo_start_xmit() with the MAC header unset. A driver that reads eth_hdr(skb) on transmit then dereferences skb->head + (u16)~0, an out-of-bounds access ~64 KiB past the head -- the same class fixed for one consumer in commit f5089008f90c ("macsec: do not read an unset MAC header in macsec_encrypt()"). packet_parse_headers() runs only on the transmit path, where skb->data points at the start of the L2 header for every packet-socket type regardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied header and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC header unconditionally, mirroring __dev_queue_xmit(), so the frame is anchored on the bypass path too. Found by 0sec (https://0sec.ai) using automated source analysis; verified against source and matched to the macsec KASAN report in f5089008f90c. Compile-tested.
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 75c65772c3d18447d62d3aca5f91b06c16cc25e4 ~ 1e43a1d66615f411d427f9df1f46dd049d9e3681 -
Linux Linux 5.1 -

II. Public POCs for CVE-2026-74667

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III. Intelligence Information for CVE-2026-74667

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Patches & Fixes for CVE-2026-74667 (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-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74667

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