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CVE-2026-43040— net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak

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ndisc_ra_useropt函数未初始化nduseroptmsg结构中的填充字段，导致内核数据信息泄露。

AI Predicted 5.3 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 31910575a9de61e78065e93846e8e7a4894a18bf< 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c affected
31910575a9de61e78065e93846e8e7a4894a18bf< 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 affected
31910575a9de61e78065e93846e8e7a4894a18bf< 11d7fe97421cfc81549940c20ed5ac9472d6db05 affected
31910575a9de61e78065e93846e8e7a4894a18bf< 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d affected
31910575a9de61e78065e93846e8e7a4894a18bf< 4f810c686fde509d1cdaa706322d9d2531f8f1a4 affected
31910575a9de61e78065e93846e8e7a4894a18bf< b485eef3d97b7aae55ce669b6de555ec81f3d21c affected
31910575a9de61e78065e93846e8e7a4894a18bf< ef3645606e4a635d5062a492f22b7f490852ee67 affected
31910575a9de61e78065e93846e8e7a4894a18bf< ae05340ccaa9d347fe85415609e075545bec589f affected
… +10 more rows
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I. Basic Information for CVE-2026-43040

Vulnerability Information
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Vulnerability Title
net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Router Advertisements with user options the kernel builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct has three padding fields that are never zeroed and can leak kernel data The fix is simple, just zeroes the padding fields.
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ndisc_ra_useropt函数未初始化nduseroptmsg结构中的填充字段，导致内核数据信息泄露。
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 31910575a9de61e78065e93846e8e7a4894a18bf ~ 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-43040

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III. Intelligence Information for CVE-2026-43040

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Patches & Fixes for CVE-2026-43040 (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-2026-31705 9.8 CRITICAL ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-43037 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
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-2026-31735 8.8 HIGH iommupt: Fix short gather if the unmap goes into a large mapping
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-2026-31717 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-2026-31708 8.1 HIGH smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
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-2026-31771 8.1 HIGH Bluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-31772 7.8 HIGH Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync

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-2026-43040

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