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CVE-2026-99070— ipv6: do not warn on route notification size race

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，以下漏洞已得到修复： ipv6：避免在路由通知大小竞争时发出警告 fib6_info_hw_flags_set() 函数使用 rt6_nlmsg_size() 计算 skb（套接字缓冲区）的大小，随后通过 rt6_fill_node() 填充该缓冲区。当启用下一跳（nexthop）兼容模式时，在这两个独立快照之间，可能会发生并发替换操作，导致组（group）尺寸增大。因此，rt6_fill_node() 合法地返回 -EMSGSIZE 错误，此时发出的警告并不能证明存在真正的尺寸计算缺陷。

EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 907eea486888cfe118c19759bbc4b8fca2e004df< 8a3b935b6b6037eefb36bd27a60793a008358e8d affected
907eea486888cfe118c19759bbc4b8fca2e004df< 7b112bd43f1172fb152e848570a957467008a5ae affected
907eea486888cfe118c19759bbc4b8fca2e004df< 4ac7d92a4698e34e614c254359665b9de1f65283 affected
907eea486888cfe118c19759bbc4b8fca2e004df< 291fe0bafee78c95f9f2e7f579f17793fd5a1e5a affected
907eea486888cfe118c19759bbc4b8fca2e004df< c97426ec649d99596d8969e1a052c16b14b7b485 affected
5.12 affected
< 5.12 unaffected
6.6.160≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-99070

Vulnerability Information
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Vulnerability Title
ipv6: do not warn on route notification size race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: do not warn on route notification size race fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug. Remove the warning. The existing error path still frees the skb and reports the error to listeners.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 907eea486888cfe118c19759bbc4b8fca2e004df ~ 8a3b935b6b6037eefb36bd27a60793a008358e8d -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-99070

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III. Intelligence Information for CVE-2026-99070

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Patches & Fixes for CVE-2026-99070 (3)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections
CVE-2026-99014 7.8 HIGH Bluetooth: hci_sync: Fix command skb lifetime during scan setup
CVE-2026-99053 7.8 HIGH tipc: hold a reference to nodes found by link name
CVE-2026-98945 7.8 HIGH HID: steam: Rearrange teardown sequence
CVE-2026-99051 7.8 HIGH fsverity: RCU-delay the freeing of struct fsverity_info

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux