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CVE-2026-74597— ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

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： ip6_tunnel: 在 ip6ip6_err() 中清空 skb2->cb[] ip6ip6_err() 函数会克隆一个外层 IPv6 ICMP 错误报文（skb），将其头部向下调整以提取所引用的内层 IPv6 数据包，随后将该克隆报文传递给 icmpv6_send()。然而，该克隆报文中仍保留了外层数据包 inet6_skb_parm 信息，存储在 skb->cb[] 中。 若外层数据包包含 Home Address 选项（Home Address Option, H

CVSS 9.8 · Critical EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e490d1d85cf5e191791979e5f260d32eb4f703a8< 44fe898df302e91c5ee5acbc71ffa74e78e6c183 affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< 0dadb0620ab65949a8bc2439dd28ea3c942fe87d affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< b6816536a2990c0db44a26130a03e40b441e829b affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< 64e41736a26f37ab6215bc2e6df125df05aceb08 affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< 484134e1eb07d700a73b1e4bbf3fb503e299be60 affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< 4eb15c465337b18f44716c499cd6ad63eee0ad54 affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< fbf40faa0414b753212494ad197542002e66ed9e affected
e490d1d85cf5e191791979e5f260d32eb4f703a8< f803c086399da277b5d0ff36a107d0f162751800 affected
… +10 more rows
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I. Basic Information for CVE-2026-74597

Vulnerability Information
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Vulnerability Title
ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.
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 e490d1d85cf5e191791979e5f260d32eb4f703a8 ~ 44fe898df302e91c5ee5acbc71ffa74e78e6c183 -
Linux Linux 2.6.22 -

II. Public POCs for CVE-2026-74597

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III. Intelligence Information for CVE-2026-74597

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Patches & Fixes for CVE-2026-74597 (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-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
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-2026-74691 8.8 HIGH net: thunderbolt: Tear down DMA paths before stopping the rings

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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