CVE-2026-45846bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 31e010a106ff6cd8ccac4bfee547fd3fa1015574
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 55193df8d6d33318435f19572bf5ea47a22eee28
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 51eef9c072aa3405a6823a96ae666d38a3b48750
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < a0f4e4e8e0f5e24ddd83e3d1221732621cf34636
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 35a115a204be08f97450b0389413e218268ef4a2
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 74a02921c48fcd35a7881956c9e5c52b86595f5d
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < 638905520fc4fae6a80991563f264131545ba3df
- affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 – < aa6c6d9ee064aabfede4402fd1283424e649ca19
- affected 5.7
- unaffected < 5.7
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.141 – ≤ 6.6.*
- unaffected 6.12.91 – ≤ 6.12.*
- unaffected 6.18.33 – ≤ 6.18.*
- unaffected 7.0.10 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574 (opens in a new tab)
- https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28 (opens in a new tab)
- https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750 (opens in a new tab)
- https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636 (opens in a new tab)
- https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2 (opens in a new tab)
- https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d (opens in a new tab)
- https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df (opens in a new tab)
- https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32172 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-45846)Record last updated .