CVE-2026-45846 Details
Description
In the Linux kernel, the following vulnerability has been resolved: bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst() bareudp_fill_metadata_dst() passes bareudp->sock to udp_tunnel6_dst_lookup() in the IPv6 path without a NULL check. The socket is only created in bareudp_open() and NULLed in bareudp_stop(), so calling this function while the device is down triggers a NULL dereference via sock->sk. BUG: kernel NULL pointer dereference, address: 0000000000000018 RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160) Call Trace: <TASK> bareudp_fill_metadata_dst (drivers/net/bareudp.c:532) do_execute_actions (net/openvswitch/actions.c:901) ovs_execute_actions (net/openvswitch/actions.c:1589) ovs_packet_cmd_execute (net/openvswitch/datapath.c:700) genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114) genl_rcv_msg (net/netlink/genetlink.c:1209) netlink_rcv_skb (net/netlink/af_netlink.c:2550) </TASK> Add a NULL check returning -ESHUTDOWN, consistent with the xmit paths in the same driver.
A NULL pointer dereference vulnerability has been identified in the Linux kernel's BareUDP implementation. The issue arises in the 'bareudp_fill_metadata_dst()' function, which passes a socket reference to 'udp_tunnel6_dst_lookup()' without checking for NULL. This oversight can lead to a kernel crash when the BareUDP device is inactive, as the socket reference is NULLed during the 'bareudp_stop()' process. The vulnerability was introduced in a commit that added the BareUDP module for UDP tunnel encapsulation.
The vulnerability has been addressed by adding a NULL check for the socket reference in the 'bareudp_fill_metadata_dst()' function. Users should apply the latest patches available in the Linux kernel stable tree to mitigate this issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574 | kernel.org | Patch |
| https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750 | kernel.org | Patch |
| https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28 | kernel.org | Patch |
| https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df | kernel.org | Patch |
| https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d | kernel.org | Patch |
| https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636 | kernel.org | Patch |
| https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.7, < 5.10.258 >= 5.11, < 5.15.209 >= 5.16, < 6.1.175 >= 6.2, < 6.6.141 >= 6.7, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 7.1 rc1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 25, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 1, 2026 | CVE Modified | kernel.org |
| May 27, 2026 | New CVE Received | kernel.org |