VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

Compare

Not known to be exploited · fixed in aa6c6d9ee064aabfede4402fd1283424e649ca19 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in aa6c6d9ee064aabfede4402fd1283424e649ca19, a0f4e4e8e0f5e24ddd83e3d1221732621cf34636, 638905520fc4fae6a80991563f264131545ba3df +5

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < aa6c6d9ee064aabfede4402fd1283424e649ca19	Fixed in aa6c6d9ee064aabfede4402fd1283424e649ca19
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < a0f4e4e8e0f5e24ddd83e3d1221732621cf34636	Fixed in a0f4e4e8e0f5e24ddd83e3d1221732621cf34636
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < 638905520fc4fae6a80991563f264131545ba3df	Fixed in 638905520fc4fae6a80991563f264131545ba3df
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < 55193df8d6d33318435f19572bf5ea47a22eee28	Fixed in 55193df8d6d33318435f19572bf5ea47a22eee28
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < 74a02921c48fcd35a7881956c9e5c52b86595f5d	Fixed in 74a02921c48fcd35a7881956c9e5c52b86595f5d
LinuxLinux	Affected ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065, < 51eef9c072aa3405a6823a96ae666d38a3b48750	Fixed in 51eef9c072aa3405a6823a96ae666d38a3b48750

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.

References

Community reviews

Loading reviews…