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CVE-2026-80681— vxlan: re-fetch eth header after route_shortcircuit()

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： vxlan: 在 route_shortcircuit() 之后重新获取以太网头部 在调用 之前，代码会从 缓存了以太网头部（eth header）的指针。 在 内部，可能会调用 ，该函数可能导致 被重新分配。 在这种情况下，当控制流返回到 时，之前缓存的 eth 指针指向了已释放的内存，导致在解引用 时发生“释放后使用”（use-after-free）错误。 修复方式：在调用 之后，重新执行 以更新以太网头部指针。

CVSS 9.8 · Critical EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ae8840825605f36f98f247323edc150e761cb64e< 6375093eb45cd7d89f1945f939eeae3b29d79f56 affected
ae8840825605f36f98f247323edc150e761cb64e< 1b7f7b653e3557690047c62f03b80a24ea5a58a5 affected
ae8840825605f36f98f247323edc150e761cb64e< bf045341dfb3e767f0ff94cf240ce3c371973bd4 affected
ae8840825605f36f98f247323edc150e761cb64e< 2355c8c26d2aa1b4385b369e67202e47d460d555 affected
ae8840825605f36f98f247323edc150e761cb64e< 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 affected
ae8840825605f36f98f247323edc150e761cb64e< 1235e017aa11cf01e91b613c4c5ed6aa28934fff affected
ae8840825605f36f98f247323edc150e761cb64e< c9dceac9e1c7c772c43c732fc0d325e72835801a affected
ae8840825605f36f98f247323edc150e761cb64e< 1395a676ec15a0a02a2a6d86602324f2d5fd41d5 affected
… +10 more rows
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I. Basic Information for CVE-2026-80681

Vulnerability Information
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Vulnerability Title
vxlan: re-fetch eth header after route_shortcircuit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().
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 ae8840825605f36f98f247323edc150e761cb64e ~ 6375093eb45cd7d89f1945f939eeae3b29d79f56 -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-80681

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III. Intelligence Information for CVE-2026-80681

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Patches & Fixes for CVE-2026-80681 (8)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80683 8.8 HIGH Bluetooth: SCO: give the socket its own sco_conn reference
CVE-2026-80692 8.8 HIGH Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks
CVE-2026-80633 8.8 HIGH iommufd: Take dma_resv lock before dma_buf_unpin() in release path
CVE-2026-80672 8.8 HIGH ntfs: fix u16 truncation of restart-area length check

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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