CVE-2026-56117— dhcpcd Heap Use-After-Free via Control Socket Handling
Possible ATT&CK Techniques 2AI
T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client ExecutionAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| NetworkConfiguration | dhcpcd | ≤ 10.3.2 | affected |
78ea09ed1633a583dbcde6e7bab9df4639ec8a34 | unaffected |
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I. Basic Information for CVE-2026-56117
Vulnerability Information
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Vulnerability Title
dhcpcd Heap Use-After-Free via Control Socket Handling
Source: CVE Program / CVE List V5
Vulnerability Description
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
NetworkConfiguration dhcpcd 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NetworkConfiguration dhcpcd是NetworkConfiguration团队的一款DHCP客户端软件。 NetworkConfiguration dhcpcd 10.3.2及之前版本存在资源管理错误漏洞，该漏洞源于src/control.c中控制套接字处理存在堆释放后重用，可能导致本地低权限攻击者在权限分离禁用时触发内存损坏。
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 |
|---|---|---|---|---|
| NetworkConfiguration | dhcpcd | 0 ~ 10.3.2 | - |
II. Public POCs for CVE-2026-56117
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-56117 (1)
News Coverage for CVE-2026-56117 (1)
Same Patch Batch · NetworkConfiguration · 2026-06-23 · 4 CVEs total
| CVE-2026-56116 | 6.5 MEDIUM | dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling |
| CVE-2026-56113 | 5.3 MEDIUM | dhcpcd Heap Use-After-Free in dhcp6_deprecateaddrs via DHCPv6 RENEW |
| CVE-2026-56114 | 5.3 MEDIUM | dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage() |
IV. Related Vulnerabilities
Same weakness: CWE-416
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Use-after-free race in kernel `k_queue_peek_head/tail` due t - CVE-2026-71847
Ruby JSON: JSON::ResumableParser#partial_value dereferences - CVE-2026-19176
Chrome 151.0.7922.109前存在Skia内存使用后释放漏洞 - CVE-2026-19175
Google Chrome 资源管理错误漏洞
V. Comments for CVE-2026-56117
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