← Vulnerability feed

Vulnerability record · CVE-2026-5071 · published 30 May 2026

CVE-2026-5071: Zephyrproject zephyr out-of-bounds read vulnerability

Zephyrproject · Zephyr

The SocketCAN implementation validates the length of a user-provided buffer containing a socketcan_frame object using only a NET_ASSERT statement in zcan_sendto_ctx() before dereferencing it in socketcan_to_can_frame(). In production builds where assertions are disabled, a userspace application that controls the length passed to a sendto syscall can supply an incomplete or truncated frame, causing socketcan_to_can_frame() to dereference fields beyond the end of the buffer. This results in an out-of-bounds read that can cause denial-of-service crashes or, because the parsed frame contents are transmitted on the network, leak adjacent memory.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.4% CWE-125 · Out-of-bounds read
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
22 Jul 2026Last modified by NVD

Description

The SocketCAN implementation validates the length of a user-provided buffer containing a socketcan_frame object using only a NET_ASSERT statement in zcan_sendto_ctx() before dereferencing it in socketcan_to_can_frame(). In production builds where assertions are disabled, a userspace application that controls the length passed to a sendto syscall can supply an incomplete or truncated frame, causing socketcan_to_can_frame() to dereference fields beyond the end of the buffer. This results in an out-of-bounds read that can cause denial-of-service crashes or, because the parsed frame contents are transmitted on the network, leak adjacent memory.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3w6-x7m3-3c58 ExploitPatchVendor Advisory

Track CVE-2026-5071 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2023-4260Zephyrproject zephyr classic buffer overflow vulnerabilityPotential off-by-one buffer overflow vulnerability in the Zephyr fuse file system.EPSS 0.77%9.8CVE-2026-10666Zephyrproject zephyr stack-based buffer overflow vulnerabilityparse_ipv4() in subsys/net/ip/utils.c (reached via net_ipaddr_parse() for strings of the form "a.b.c.d:port") copies the port substring into a fixed …EPSS 0.65%9.8CVE-2026-5067Zephyrproject zephyr out-of-bounds write vulnerabilityA remote, unauthenticated attacker can trigger memory corruption in Zephyr's HTTP server WebSocket upgrade path by sending a crafted Sec-WebSocket-Ke…EPSS 0.87%9.8CVE-2026-1678Zephyrproject zephyr out-of-bounds write vulnerabilitydns_unpack_name() caches the buffer tailroom once and reuses it while appending DNS labels. As the buffer grows, the cached size becomes incorrect, a…EPSS 0.38%9.8CVE-2023-6881Zephyrproject zephyr classic buffer overflow vulnerabilityPossible buffer overflow in is_mount_pointEPSS 0.44%9.8CVE-2023-6249Zephyrproject zephyr vulnerabilitySigned to unsigned conversion esp32_ipm_sendEPSS 0.44%9.8CVE-2023-5779Zephyrproject zephyr out-of-bounds write vulnerabilitycan: out of bounds in remove_rx_filter functionEPSS 0.44%9.8CVE-2023-6749Zephyrproject zephyr stack-based buffer overflow vulnerabilityUnchecked length coming from user input in settings shellEPSS 0.44%

Source: NIST National Vulnerability Database (record CVE-2026-5071), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.