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CVE-2026-74598— ipv6: fix Route Information option length validation

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，已修复以下安全漏洞： IPv6：修复路由信息选项（Route Information Option）长度验证缺陷 函数 在验证路由信息选项（依据 RFC 4191）的长度时，将其与前缀长度进行比较，但两个检查都存在“差一错误”（off-by-one）。 表示网络邻居（ND）选项的长度，单位为 8 字节（octets），包含 8 字节的选项头部。因此，一个携带 N 字节前缀数据的选项，其长度应等于 。根据 RFC 4191 第 2.3 节的规定： 当前缀长度大于 64 时，长度必须为 3； 当

CVSS 7.5 · High EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 70ceb4f53929f73746be72f73707cd9f8753e2fc< 2f6f94eda12430fb41b24b44a71e2ea4e93561d7 affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< 7eac87396c44a312be457ef41d4c5687883be9a2 affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< 7309529f257ae18e72112ef9f614edfd6df229bb affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< 0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< ff3cb05289b8a4ef95fa7ea14c7d34818359edbb affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< 3b2231e358d26e3aec5d8040b1fb777af03c5f05 affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< da64ed1f346ba84df574d6469fa2e422b2511719 affected
70ceb4f53929f73746be72f73707cd9f8753e2fc< d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824 affected
… +10 more rows
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I. Basic Information for CVE-2026-74598

Vulnerability Information
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Vulnerability Title
ipv6: fix Route Information option length validation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix Route Information option length validation rt6_route_rcv() validates the Route Information option (RFC 4191) length against the prefix length, but both checks are off by one. rinfo->length is the ND option length in units of 8 octets and it *includes* the 8-byte option header, so an option carrying N bytes of prefix has length == 1 + N/8. RFC 4191 section 2.3 requires length 3 when Prefix Length is greater than 64, and 2 or 3 when it is greater than 0. The code accepts length >= 2 and length >= 1 respectively. ipv6_addr_prefix() then copies prefix_len/8 bytes out of rinfo->prefix, so a Router Advertisement with (prefix_len=128, length=2) or (prefix_len=64, length=1) makes the kernel read up to 8 bytes past the end of the option. Those bytes end up in the prefix of the route that gets installed, so they are visible to userspace: # RA with a Route Information option (prefix_len=128, length=2) # followed by a source link-layer address option, 01 01 de ad be ef ca fe $ ip -6 route show 2001:db8:dead:beef:101:dead:beef:cafe via fe80::1234 dev veth0 proto ra ^^^^^^^^^^^^^^^^^^ the next option, read out of bounds When the Route Information option is the last one in the packet, those eight bytes come from the skb tail room instead. Reject the option lengths RFC 4191 does not allow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 70ceb4f53929f73746be72f73707cd9f8753e2fc ~ 2f6f94eda12430fb41b24b44a71e2ea4e93561d7 -
Linux Linux 2.6.17 -

II. Public POCs for CVE-2026-74598

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III. Intelligence Information for CVE-2026-74598

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Patches & Fixes for CVE-2026-74598 (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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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-2026-74586 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-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
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-2026-74712 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

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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