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CVE-2026-74668— packet: use consistent hard_header_len in TX_RING send 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.

在 Linux 内核中，已修复以下漏洞： packet：在 TX_RING 发送路径中一致使用 hard_header_len 函数在 中分别读取 ，用于 skb 分配和头部构造。由于网络设备可能同时发生重新配置，这会导致预留的头部空间（headroom）小于后续实际推送的大小，或者使 的计算结果为负数。 解决方案是：在处理环形缓冲区（ring）中的帧之前，先一次性快照（snapshot）获取 的值，并将该快照值用于帧长度限制、头部空间分配、拷贝长度计算以及 skb 的构造。将该快照值传递给 。 注意：此处未解决

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1< d85d2fd54e901637c81d847811e03c662aee13cd affected
69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1< 016763e829cac37b3234eace86fd0a4c560de4a7 affected
69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1< 27e068d1b35dbec10a3cf268887c94407be4badc affected
69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1< d48ea5c9c4c34dc0df621f0e39ed3a16b644621a affected
69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1< 21b5953e7494c16a42e6cd8cf110e18d13ae4a6b affected
2.6.31 affected
< 2.6.31 unaffected
6.6.152≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74668

Vulnerability Information
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Vulnerability Title
packet: use consistent hard_header_len in TX_RING send path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in TX_RING send path tpacket_snd() reads dev->hard_header_len independently for skb allocation and header construction in tpacket_fill_skb(). Concurrent netdevice reconfiguration can therefore make the reserved headroom smaller than the amount later pushed, or make copylen - hard_header_len negative. Snapshot hard_header_len once before processing ring frames and use it for the frame limit, headroom allocation, copy length, and skb construction. Pass the snapshot to tpacket_fill_skb(). The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.
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 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 ~ d85d2fd54e901637c81d847811e03c662aee13cd -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-74668

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III. Intelligence Information for CVE-2026-74668

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Patches & Fixes for CVE-2026-74668 (5)

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-2026-74668

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