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CVE-2026-80838— vxlan: keep the last remote linked during FDB flush

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vxlan的FDB刷新过程未在过滤删除时保留最后一个remote链接，导致空链表头被用于list_entry_rcu产生无效remote指针，接收学习路径可对其进行读写，可能造成内存破坏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f< 2a7c2f00843225d5f037676bca649321f3d024c7 affected
c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f< a8820c8a7718327e96849782033e7c85a0f6bcfe affected
c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f< 8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c affected
c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f< 4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab affected
c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f< d5d4a7b538b52db63927773a8905fcd9f78a42e2 affected
6.7 affected
< 6.7 unaffected
6.12.108≤ 6.12.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80838

Vulnerability Information
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Vulnerability Title
vxlan: keep the last remote linked during FDB flush
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: keep the last remote linked during FDB flush A non-nexthop FDB entry is expected to have at least one remote while it remains reachable through the FDB hash table. A filtered bulk flush violates this invariant when every remote matches: It unlinks the last remote in vxlan_fdb_dst_destroy() and only afterwards tells vxlan_flush() to destroy the parent FDB entry. An RCU reader can find the parent during this interval. first_remote_rcu() then applies list_entry_rcu() to the empty list head, producing an invalid remote pointer that the receive learning path can read from and write to. When a matching remote is the sole remaining remote, leave it linked and ask the caller to destroy the entire FDB entry. vxlan_fdb_destroy() keeps the remote attached while sending the deletion notification and removing the parent from the lookup structures.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vxlan的FDB刷新过程未在过滤删除时保留最后一个remote链接，导致空链表头被用于list_entry_rcu产生无效remote指针，接收学习路径可对其进行读写，可能造成内存破坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f ~ 2a7c2f00843225d5f037676bca649321f3d024c7 -
Linux Linux 6.7 -

II. Public POCs for CVE-2026-80838

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III. Intelligence Information for CVE-2026-80838

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Patches & Fixes for CVE-2026-80838 (5)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80838

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