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CVE-2026-74612— veth: fix skb length accounting after XDP frag adjustment

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： veth：修复在 XDP 碎片调整后的 skb 长度计数问题 veth 驱动通过 xdp_buff 暴露非线性（non-linear）的 skb 碎片。当 XDP 程序调整碎片区域时， 会将 复制回 ，但 仍保留旧的碎片贡献值。 在碎片收缩的情况下，这会导致 大于实际的线性区域长度。在复现的 UDP 接收路径中， 从 开始，向用户空间复制了超出实际线性尾端 1024 字节的数据。被复制的字节中包含了受影响 skb 的 、 ，以及来自 的一个内核指针。实际数据包数据被移位，并

CVSS 10.0 · Critical EPSS 0.49% · P40

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 718a18a0c8a67f97781e40bdef7cdd055c430996< 0c3024afabb8064b141f3cedcb1ddd6ab05ad9d5 affected
718a18a0c8a67f97781e40bdef7cdd055c430996< 2f2a7f3f8b9f1bffc9b0488aa02b6951b2aec139 affected
718a18a0c8a67f97781e40bdef7cdd055c430996< 41b96667d42b74bb4b137f1bb78b611a953c5943 affected
718a18a0c8a67f97781e40bdef7cdd055c430996< cdf745b7a777f87f51666e5d8f4c6fc279bcf54d affected
718a18a0c8a67f97781e40bdef7cdd055c430996< 3205b0652a37255dbb7ca8f3d942c8d8aa677c21 affected
718a18a0c8a67f97781e40bdef7cdd055c430996< cb6379feaaff11c4e1e79c26c745ffa23182768a affected
5.18 affected
< 5.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74612

Vulnerability Information
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Vulnerability Title
veth: fix skb length accounting after XDP frag adjustment
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: veth: fix skb length accounting after XDP frag adjustment veth exposes non-linear skb fragments through an xdp_buff. If an XDP program adjusts the fragment area, veth_xdp_rcv_skb() copies xdp_frags_size back to skb->data_len but leaves skb->len containing the old fragment contribution. After a fragment shrink, this makes skb_headlen() larger than the actual linear area. In the reproduced UDP receive path, __skb_datagram_iter() copied 1024 bytes past the actual linear tail to userspace, starting at struct skb_shared_info. The copied bytes included the affected skb's nr_frags, xdp_frags_size, and a kernel pointer from skb_shinfo(skb)->frags[0]. Real packet data was displaced by the same amount and truncated at the end. Subtract the old data_len before replacing it and add the new data_len afterwards, keeping skb->len and skb->data_len synchronized. Additionally, bpf_xdp_pull_data() can advance data_end while leaving frags present. The skb is then still non-linear, so the old __skb_put(skb, off) triggers SKB_LINEAR_ASSERT(). Use skb_set_tail_pointer() and update skb->len explicitly instead, following bpf_prog_run_generic_xdp(). Unlike __skb_put(), skb_set_tail_pointer() does not require a linear skb. A 60000-byte UDP datagram on a veth pair with MTU 64000 was shortened by 1024 bytes from its fragment area. Before the fix, all 10 runs produced corrupted payloads. After the fix, all 10 runs matched the expected payload exactly. A forced-tailroom reproducer also exercises bpf_xdp_pull_data() with frags still present; the old code triggers SKB_LINEAR_ASSERT(), while this fix passes 10/10 runs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 718a18a0c8a67f97781e40bdef7cdd055c430996 ~ 0c3024afabb8064b141f3cedcb1ddd6ab05ad9d5 -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-74612

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III. Intelligence Information for CVE-2026-74612

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Patches & Fixes for CVE-2026-74612 (6)

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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
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-2026-74587 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-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74730 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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
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-2026-74702 8.8 HIGH vhost-scsi: reject feature changes after endpoint

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-2026-74612

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