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CVE-2026-74616— xdp: reject clones that overrun skb_shared_info tailroom

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： XDP：拒绝超出 skb_shared_info 尾部空间（tailroom）的克隆帧 函数将广播副本克隆到单个页面中，并将 设置为 。随后， 将该页面视为普通的 XDP 帧，并期望在缓冲区末尾存在常规的 尾部空间。 当前的检查仅拒绝那些线性部分的 XDP 帧头、头部预留空间（headroom）以及包数据总大小超过 的帧。然而，由更大分配 backing 的源帧仍可能通过此检查，但其数据会延伸到克隆帧所需的共享信息区域。当此类克隆帧被转换回 sk_buff（skb）结构时，

CVSS 9.8 · Critical EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 58408982fa39f9758124cec169f42854d6f98f35 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 685edea27ac68d08fe4dbd3de74b858d2ad8e830 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< ba13763d667e008e185fedf592d53846a5b457d1 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< ef4b7c7046d29a67090de15af0da0d1ae8d1b192 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< fab820f1691a9e26d9031f18aae1e9ce09078f92 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< e48e8edbef2eb824201495daa5234560f632b23c affected
5.14 affected
… +8 more rows
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I. Basic Information for CVE-2026-74616

Vulnerability Information
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Vulnerability Title
xdp: reject clones that overrun skb_shared_info tailroom
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 e624d4ed4aa8cc3c69d1359b0aaea539203ed266 ~ 58408982fa39f9758124cec169f42854d6f98f35 -
Linux Linux 5.14 -

II. Public POCs for CVE-2026-74616

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III. Intelligence Information for CVE-2026-74616

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Patches & Fixes for CVE-2026-74616 (7)

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

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
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
CVE-2026-74615 8.8 HIGH vxlan: do not arm the ageing timer on a device that is down

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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