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CVE-2026-74669— ipvs: clear IPv4 options after rebasing tunnel ICMP errors

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，已解决以下漏洞： ipvs：在重新定位隧道 ICMP 错误后清除 IPv4 选项 函数在将 skb 从外部 ICMP 数据包重新定位到被引用的原始请求之前，会将其传递给 。然而， 仍然描述的是外部 IPv4 头部。 因此，外部头部中的时间戳选项可能会留下一个偏移量，该偏移量在重新定位后指向被引用的传输层头部。 将位于该过时位置的字节视为选项长度，并将其复制到 栈上的固定大小选项存储区中，从而导致栈溢出写操作。 在重置网络头部后清除过时的选项元数据。保留其余控制块字段，包括 ICMP 响应路径

CVSS 9.8 · Critical EPSS 0.51% · P41

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< 79ffa99202c944467e28b13b513bf2998732edff affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< c9413b50204738fbc429bb86bf01353c393a6c28 affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< 37c61b3745129cbd682c557b51345828120972e5 affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< ed246dd85ebf27c1f6b7897834d40786c0ca3006 affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< 6f46fc460e9316062bdcdf89199eb5d7a33da33b affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< 75eec935444db4af2123e0491936f6e273d7ea00 affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< 384b4dae14277d369221d187e9b3af56c79d2e50 affected
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e< e0ba936287dfe9783426aac27e5fd76fe35b38c9 affected
… +10 more rows
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I. Basic Information for CVE-2026-74669

Vulnerability Information
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Vulnerability Title
ipvs: clear IPv4 options after rebasing tunnel ICMP errors
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response 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 f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e ~ 79ffa99202c944467e28b13b513bf2998732edff -
Linux Linux 3.7 -

II. Public POCs for CVE-2026-74669

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III. Intelligence Information for CVE-2026-74669

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Patches & Fixes for CVE-2026-74669 (8)

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-2026-74608 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-2026-74723 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-2026-74730 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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
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-2026-74669

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