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CVE-2026-99071— ipv4: 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： ipv4：针对路由通知大小的竞态条件，不再发出警告。 提交 680aea08e78c（"net: ipv4: 当 fib 硬件标志发生变化时发出通知”）为硬件标志变更添加了异步路由通知。 函数在仅持有 RCU（读 - 拷贝 - 更新）锁的情况下，先调用 计算套接字缓冲区（skb）的大小，随后调用 填充该缓冲区。当启用了下一跳（nexthop）兼容模式时，在这两个独立快照之间，并发替换操作可能导致路由组扩大。因此， 合法地返回 错误，此时发出的警告并不能证明存在大小计算错

EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 680aea08e78c003292415518ad270bc20f9c80b1< 088ba80eef85fa7a5ad8f9e7c82b403c99242b56 affected
680aea08e78c003292415518ad270bc20f9c80b1< 78a1cf5c54b2f795c81fedb530755a8d01cc84f0 affected
680aea08e78c003292415518ad270bc20f9c80b1< 7dfa7ca97f3ac46353edd4cc44f7733758e4535b affected
680aea08e78c003292415518ad270bc20f9c80b1< 221ef5e1e44a044790f0f54e6aa237883f475a4d affected
680aea08e78c003292415518ad270bc20f9c80b1< e02a5b6588161673ef75a4bc5cdfb62bd493374d 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-2026-99071

Vulnerability Information
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Vulnerability Title
ipv4: 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: ipv4: do not warn on route notification size race Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added asynchronous route notifications for hardware flag changes. fib_alias_hw_flags_set() sizes the skb with fib_nlmsg_size() and later fills it with fib_dump_info() while holding only RCU. With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. fib_dump_info() 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 680aea08e78c003292415518ad270bc20f9c80b1 ~ 088ba80eef85fa7a5ad8f9e7c82b403c99242b56 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-99071

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III. Intelligence Information for CVE-2026-99071

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Patches & Fixes for CVE-2026-99071 (4)

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

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Same vendor: Linux