Medium 5.5Published May 27, 2026

CVE-2026-45846bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

Updated under an hour ago (Oct 26, 2026, 7:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	571912c69f0ed731bd1e071ade9dc7ca4aa52065 builds before 31e010a106ff6cd8ccac4bfee547fd3fa1015574; 571912c69f0ed731bd1e071ade9dc7ca4aa52065 builds before 55193df8d6d33318435f19572bf5ea47a22eee28; 571912c69f0ed731bd1e071ade9dc7ca4aa52065 builds before 51eef9c072aa3405a6823a96ae666d38a3b48750; from 571912c69f0ed731bd1e071ade9dc7ca4aa52065 before a0f4e4e8e0f5e24ddd83e3d1221732621cf34636; 571912c69f0ed731bd1e071ade9dc7ca4aa52065 builds before 35a115a204be08f97450b0389413e218268ef4a2; 571912c69f0ed731bd1e071ade9dc7ca4aa52065 builds before 74a02921c48fcd35a7881956c9e5c52b86595f5d; from 571912c69f0ed731bd1e071ade9dc7ca4aa52065 before 638905520fc4fae6a80991563f264131545ba3df; from 571912c69f0ed731bd1e071ade9dc7ca4aa52065 before aa6c6d9ee064aabfede4402fd1283424e649ca19	CNA record
linux linux_kernel linux:linux_kernel	from 5.7 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1	NVD

References

https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574patch
https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28patch
https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750patch
https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636patch
https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2patch
https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5dpatch
https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3dfpatch
https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.