CVE-2026-45846

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dereference, address: 0000000000000018\n RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160)\n Call Trace:\n <TASK>\n bareudp_fill_metadata_dst (drivers/net/bareudp.c:532)\n do_execute_actions (net/openvswitch/actions.c:901)\n ovs_execute_actions (net/openvswitch/actions.c:1589)\n ovs_packet_cmd_execute (net/openvswitch/datapath.c:700)\n genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)\n genl_rcv_msg (net/netlink/genetlink.c:1209)\n netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n </TASK>\n\nAdd a NULL check returning -ESHUTDOWN, consistent with the xmit paths\nin the same driver."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/bareudp.c"], "versions": [{"version": "571912c69f0ed731bd1e071ade9dc7ca4aa52065", "lessThan": "31e010a106ff6cd8ccac4bfee547fd3fa1015574", "status": "affected", "versionType": "git"}, {"version": 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</TASK>\n\nAdd a NULL check returning -ESHUTDOWN, consistent with the xmit paths\nin the same driver."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.141", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.91", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, 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"6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4", "versionEndExcluding": "7.0.10", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()\n\nbareudp_fill_metadata_dst() passes bareudp->sock to\nudp_tunnel6_dst_lookup() in the IPv6 path without a NULL check.\nThe socket is only created in bareudp_open() and NULLed in\nbareudp_stop(), so calling this function while the device is down\ntriggers a NULL dereference via sock->sk.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160)\n Call Trace:\n <TASK>\n bareudp_fill_metadata_dst (drivers/net/bareudp.c:532)\n do_execute_actions (net/openvswitch/actions.c:901)\n ovs_execute_actions (net/openvswitch/actions.c:1589)\n ovs_packet_cmd_execute (net/openvswitch/datapath.c:700)\n genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)\n genl_rcv_msg (net/netlink/genetlink.c:1209)\n netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n </TASK>\n\nAdd a NULL check returning -ESHUTDOWN, consistent with the xmit paths\nin the same driver."}], "id": "CVE-2026-45846", "lastModified": "2026-11-06T16:18:46.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45846", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:42:11.877292Z", "version": "2.0.3"}}]}, "published": "2026-05-27T11:16:24.083", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()", "id": "2481868", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481868"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the bareudp driver of the Linux kernel. This vulnerability allows a local attacker to trigger a NULL pointer dereference in the `bareudp_fill_metadata_dst()` function. This occurs because the function attempts to access a NULL socket when the bareudp device is down, leading to a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-45846", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45846\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45846\nhttps://lore.kernel.org/linux-cve-announce/2026052713-CVE-2026-45846-ddca@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[571912c69f0ed731bd1e071ade9dc7ca4aa52065,a0f4e4e8e0f5e24ddd83e3d1221732621cf34636)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[571912c69f0ed731bd1e071ade9dc7ca4aa52065,35a115a204be08f97450b0389413e218268ef4a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[571912c69f0ed731bd1e071ade9dc7ca4aa52065,74a02921c48fcd35a7881956c9e5c52b86595f5d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[571912c69f0ed731bd1e071ade9dc7ca4aa52065,638905520fc4fae6a80991563f264131545ba3df)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[571912c69f0ed731bd1e071ade9dc7ca4aa52065,aa6c6d9ee064aabfede4402fd1283424e649ca19)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.33,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T12:15:05.194062+00:00", "updated": "2026-05-28T02:45:05.172692+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}