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CVE-2026-31682— bridge: br_nd_send: linearize skb before parsing ND options

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bridge中br_nd_send解析ND选项时假设选项在线性区域，可能导致访问线性缓冲区外数据。

CVSS 9.1 · Critical EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ed842faeb2bd49256f00485402f3113205f91d30< c68433fd291c9e88c00292095172c62d1997d662 affected
ed842faeb2bd49256f00485402f3113205f91d30< 4f397b950c916e9a1f8a4fce04ea0110206cad47 affected
ed842faeb2bd49256f00485402f3113205f91d30< bd91ec85aa4c77d645bd2739fc56784157a88ca2 affected
ed842faeb2bd49256f00485402f3113205f91d30< 658261898130da620fc3d0fbb0523efb3366cb55 affected
ed842faeb2bd49256f00485402f3113205f91d30< 2ba4caba423ed94d63006eb1d2227b0332ab7fcd affected
ed842faeb2bd49256f00485402f3113205f91d30< 9c55e41c73af5c4511070933b1bd25248521270c affected
ed842faeb2bd49256f00485402f3113205f91d30< 3a30f6469b058574f49efde61cd6f5d79e576053 affected
ed842faeb2bd49256f00485402f3113205f91d30< a01aee7cafc575bb82f5529e8734e7052f9b16ea affected
… +10 more rows
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I. Basic Information for CVE-2026-31682

Vulnerability Information
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Vulnerability Title
bridge: br_nd_send: linearize skb before parsing ND options
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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bridge中br_nd_send解析ND选项时假设选项在线性区域，可能导致访问线性缓冲区外数据。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ed842faeb2bd49256f00485402f3113205f91d30 ~ c68433fd291c9e88c00292095172c62d1997d662 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-31682

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III. Intelligence Information for CVE-2026-31682

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Same Patch Batch · Linux · 2026-04-25 · 13 CVEs total

CVE-2026-31685 9.4 CRITICAL netfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-31683 7.8 HIGH batman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-31680 7.8 HIGH net: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-31678 7.8 HIGH openvswitch: defer tunnel netdev_put to RCU release
CVE-2026-31675 7.8 HIGH net/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-31673 7.8 HIGH af_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-31676 7.5 HIGH rxrpc: only handle RESPONSE during service challenge
CVE-2026-31679 7.1 HIGH openvswitch: validate MPLS set/set_masked payload length
CVE-2026-31674 7.1 HIGH netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684 net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681 netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677 crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31682

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