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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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 2.6.22版本存在安全漏洞，该漏洞源于ip6ip6_err()函数未清除skb2->cb[]控制块，导致解析内部IPv6数据包时复用外部数据包的过时主地址选项偏移，可能造成越界访问并破坏skb_shared_info。

CVSS 9.8 · Critical EPSS 0.54% · P44

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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 2.6.22版本存在安全漏洞，该漏洞源于ip6ip6_err()函数未清除skb2->cb[]控制块，导致解析内部IPv6数据包时复用外部数据包的过时主地址选项偏移，可能造成越界访问并破坏skb_shared_info。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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 · 149 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-2026-74608 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-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
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-2026-74655 8.8 HIGH serial: qcom-geni: fix TX DMA buffer flush

Showing top 20 of 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74597

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