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CVE-2026-31738— vxlan: validate ND option lengths in vxlan_na_create

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证ND选项长度，可能导致解析器越界或使用过短的源LLADDR选项负载。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< 901c1dd3bab2955d7e664f914c374c8c3ac2b958 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< e476745917a1e288eb15e7ff49d286a86a4861d3 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< 2029712fb2c87e9a8c75094906f2ee29bf08c500 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< 602596c69a70e50d9ab8c6ae0290a01f88229dd7 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< de20d2e3b9179d132f5f5b44e490d7c916c6321b affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< eddfce70a6f3107d1679b0c2fcbeb96b593bd679 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< b69c4236255bd8de16cd876e58c6f0867d1d78b1 affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa< afa9a05e6c4971bd5586f1b304e14d61fb3d9385 affected
… +14 more rows
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I. Basic Information for CVE-2026-31738

Vulnerability Information
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Vulnerability Title
vxlan: validate ND option lengths in vxlan_na_create
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlan_na_create vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证ND选项长度，可能导致解析器越界或使用过短的源LLADDR选项负载。
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 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa ~ 901c1dd3bab2955d7e664f914c374c8c3ac2b958 -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-31738

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III. Intelligence Information for CVE-2026-31738

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Patches & Fixes for CVE-2026-31738 (8)

Same Patch Batch · Linux · 2026-05-01 · 146 CVEs total

CVE-2026-43011 9.8 CRITICAL net/x25: Fix potential double free of skb
CVE-2026-43037 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-31705 9.8 CRITICAL ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-43038 9.8 CRITICAL ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
CVE-2026-43039 9.8 CRITICAL net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
CVE-2026-31718 9.8 CRITICAL ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger
CVE-2026-43018 8.8 HIGH Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
CVE-2026-31773 8.8 HIGH Bluetooth: SMP: derive legacy responder STK authentication from MITM state
CVE-2026-31739 8.8 HIGH crypto: tegra - Add missing CRYPTO_ALG_ASYNC
CVE-2026-31735 8.8 HIGH iommupt: Fix short gather if the unmap goes into a large mapping
CVE-2026-31717 8.8 HIGH ksmbd: validate owner of durable handle on reconnect
CVE-2026-43048 8.8 HIGH HID: core: Mitigate potential OOB by removing bogus memset()
CVE-2026-31709 8.8 HIGH smb: client: validate the whole DACL before rewriting it in cifsacl
CVE-2026-31706 8.8 HIGH ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()
CVE-2026-31712 8.3 HIGH ksmbd: require minimum ACE size in smb_check_perm_dacl()
CVE-2026-31771 8.1 HIGH Bluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-31779 8.1 HIGH wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()
CVE-2026-43051 8.1 HIGH HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
CVE-2026-31708 8.1 HIGH smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
CVE-2026-31695 7.8 HIGH wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31738

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