EUVD-2026-38498
GHSA-p284-r695-7gxf
Severity by source
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local-only access with high complexity due to required non-default privsep-disabled configuration; low privileges to connect; availability-only impact from daemon crash with no confidentiality or integrity consequence.
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Heap use-after-free in dhcpcd through version 10.3.2 allows local unprivileged attackers to crash the DHCP client daemon by exploiting a double-free race between READ and HANGUP events on the control socket. When an attacker sends a privileged command such as -x, control_recvdata() frees the client fd_list object while the subsequent HANGUP event delivers the same stale pointer to control_hangup(), triggering memory corruption that results in denial of network service on the affected host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following conditions simultaneously: (1) dhcpcd must be running with privilege separation disabled, either explicitly via the --disable-privsep command-line argument or implicitly because the privsep subprocess failed to initialize at startup; (2) the control socket must be operating in mode 0666 - world-readable and world-writable - so that unprivileged local users can connect to it; and (3) the attacker must have local unprivileged user access to the host. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N, score 5.7) accurately captures the threat profile: local-only attack surface, a specific non-default attack prerequisite (privsep disabled), low but required privilege, and exclusively availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local unprivileged user on a host running dhcpcd with --disable-privsep (or after a privsep initialization failure leaves the control socket world-writable) connects to the mode-0666 control socket and issues the -x command to request daemon shutdown. The command causes control_recvdata() to free the fd_list client object, after which the pending HANGUP event on the same file descriptor triggers control_hangup() with the now-stale pointer, producing a heap use-after-free that crashes the dhcpcd daemon and drops all dynamically assigned network configuration from the host. … |
| Remediation | Upgrade dhcpcd to a version incorporating upstream commit 78ea09ed1633a583dbcde6e7bab9df4639ec8a34 (https://github.com/NetworkConfiguration/dhcpcd/commit/78ea09ed1633a583dbcde6e7bab9df4639ec8a34) once distribution packages are available; an exact patched release tag is not confirmed from current data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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dhcpcd before 6.10.0, as used in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-0
dhcp6.c in dhcpcd before 6.11.7 and 7.x before 7.2.2 has a buffer over-read in the D6_OPTION_PD_EXCLUDE feature. Rated c
dhcpcd before 7.2.1 contains a buffer overflow in dhcp6_findna in dhcp6.c when reading NA/TA addresses. Rated critical s
Stack out-of-bounds write in dhcpcd (the widely-used DHCP/DHCPv6 client) through version 10.3.2 lets a same-link attacke
Stack-based buffer overflow in the get_packet method in socket.c in dhcpcd 3.2.3 allows remote attackers to cause a deni
dhcpcd before 6.10.0 allows remote attackers to cause a denial of service (invalid read and crash) via vectors related t
The decode_search function in dhcp.c in dhcpcd 3.x allows remote DHCP servers to cause a denial of service (out-of-bound
The decode_search function in dhcp.c in dhcpcd 3.x allows remote DHCP servers to cause a denial of service (out-of-bound
The decode_search function in dhcp.c in dhcpcd 3.x does not properly free allocated memory, which allows remote DHCP ser
Denial of service in dhcpcd through version 10.3.2 allows an adjacent-network attacker to exhaust memory in the daemon b
The print_option function in dhcp-common.c in dhcpcd through 6.9.1, as used in dhcp.c in dhcpcd 5.x in Android before 5.
The get_option function in dhcp.c in dhcpcd before 6.2.0, as used in dhcpcd 5.x in Android before 5.1 and other products
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allVendor StatusVendor
SUSE
Severity: Moderate| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 16.0 | Affected |
| SUSE Linux Enterprise Server 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| SUSE Linux Micro 6.2 | Affected |
| openSUSE Leap 16.0 | Affected |
| SLES-CHOST-BYOS-Aliyun | Affected |
| SLES-CHOST-BYOS-Azure | Affected |
| SLES-CHOST-BYOS-EC2 | Affected |
| SLES-CHOST-BYOS-GCE | Affected |
| SLES-CHOST-BYOS-GDC | Affected |
| SLES-CHOST-BYOS-SAP-CCloud | Affected |
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External POC / Exploit Code
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