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CVE-2026-99072— ipv4: stop route notification sizing when nexthop group shrinks

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：当下一跳组缩小时，停止路由通知的大小计算 提交 680aea08e78c（"net: ipv4: 在 fib 硬件标志变更时发送通知”）为异步硬件标志通知添加了一个仅使用 RCU 的 fib_nlmsg_size() 调用。 fib_nlmsg_size() 在每次迭代前会检查 fib_info_num_path()，随后 fib_info_nhc() 会独立地重新加载 nh->nh_grp。如果在这两次加载之间，RTM_NEWNEXTHOP 操作用一个路径更

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 680aea08e78c003292415518ad270bc20f9c80b1< 72d9d17092bb37b0717f12042a0817d01a1f9e78 affected
680aea08e78c003292415518ad270bc20f9c80b1< ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54 affected
680aea08e78c003292415518ad270bc20f9c80b1< c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49 affected
680aea08e78c003292415518ad270bc20f9c80b1< ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88 affected
680aea08e78c003292415518ad270bc20f9c80b1< d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 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-2026-99072

Vulnerability Information
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Vulnerability Title
ipv4: stop route notification sizing when nexthop group shrinks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: stop route notification sizing when nexthop group shrinks Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added an RCU-only fib_nlmsg_size() call for asynchronous hardware flag notifications. fib_nlmsg_size() checks fib_info_num_path() before each iteration, then fib_info_nhc() independently reloads nh->nh_grp. If RTM_NEWNEXTHOP replaces a group with fewer paths between those loads, fib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences it. Stop sizing when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.
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 ~ 72d9d17092bb37b0717f12042a0817d01a1f9e78 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-99072

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III. Intelligence Information for CVE-2026-99072

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Patches & Fixes for CVE-2026-99072 (5)

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