CVE-2026-23293

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If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n <TASK>\n vxlan_xmit+0x638/0x1ef0 [vxlan]\n dev_hard_start_xmit+0x9e/0x2e0\n __dev_queue_xmit+0xbee/0x14e0\n packet_sendmsg+0x116f/0x1930\n __sys_sendto+0x1f5/0x200\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x12f/0x1590\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "649e2bb74da54c96cf20729001e283626a2fefa0", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "b5190fcd75a1f1785c766a8d1e44d3938e168f45", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "5f93e6b4d12bd3a4517a6d447ea675f448f21434", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "f0373e9317bc904e7bdb123d3106fe4f3cea2fb7", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "fbbd2118982c55fb9b0a753ae0cf7194e77149fb", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "abcd48ecdeb2e12eccb8339a35534c757782afcd", "status": "affected", "versionType": "git"}, {"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945", "lessThan": "168ff39e4758897d2eee4756977d036d52884c7e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "3.12", "status": "affected"}, {"version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.77", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.17", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.7", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.12.77"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.18.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.19.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0"}, {"url": "https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc"}, {"url": "https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45"}, {"url": "https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434"}, {"url": "https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7"}, {"url": "https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb"}, {"url": "https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd"}, {"url": "https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"}], "title": "net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": 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the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n <TASK>\n vxlan_xmit+0x638/0x1ef0 [vxlan]\n dev_hard_start_xmit+0x9e/0x2e0\n __dev_queue_xmit+0xbee/0x14e0\n packet_sendmsg+0x116f/0x1930\n __sys_sendto+0x1f5/0x200\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x12f/0x1590\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.130", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.77", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.17", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.7", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "3.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:04:04.903Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23293", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:42:24.939Z", "dateReserved": "2026-01-13T15:37:45.993Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-03-25T10:26:51.160Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n <TASK>\n vxlan_xmit+0x638/0x1ef0 [vxlan]\n dev_hard_start_xmit+0x9e/0x2e0\n __dev_queue_xmit+0xbee/0x14e0\n packet_sendmsg+0x116f/0x1930\n __sys_sendto+0x1f5/0x200\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x12f/0x1590\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: vxlan: corrige la desreferencia de puntero NULL de nd_tbl cuando IPv6 est\u00e1 deshabilitado\n\nAl arrancar con el par\u00e1metro 'ipv6.disable=1', nd_tbl nunca se inicializa porque inet6_init() sale antes de que se llame a ndisc_init(), que es la funci\u00f3n que lo inicializa. Si se inyecta un paquete IPv6 en la interfaz, se llama a route_shortcircuit() y ocurre una desreferencia de puntero NULL en neigh_lookup().\n\nBUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000380\nOops: Oops: 0000 [#1] SMP NOPTI\n[...]\nRIP: 0010:neigh_lookup+0x20/0x270\n[...]\nTraza de Llamadas:\n \n vxlan_xmit+0x638/0x1ef0 [vxlan]\n dev_hard_start_xmit+0x9e/0x2e0\n __dev_queue_xmit+0xbee/0x14e0\n packet_sendmsg+0x116f/0x1930\n __sys_sendto+0x1f5/0x200\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x12f/0x1590\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nEsto se corrige a\u00f1adiendo una verificaci\u00f3n temprana en route_shortcircuit() cuando el protocolo es ETH_P_IPV6. Tenga en cuenta que ipv6_mod_enabled() no se puede usar aqu\u00ed porque VXLAN puede estar integrado incluso cuando IPv6 se compila como un m\u00f3dulo."}], "id": "CVE-2026-23293", "lastModified": "2026-11-10T13:18:39.483", "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-2026-23293", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:25:26.901090Z", "version": "2.0.3"}}]}, "published": "2026-03-25T11:16:24.520", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled", "id": "2451191", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451191"}, "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-824", "details": ["A flaw was found in the Linux kernel's Virtual Extensible LAN (VXLAN) module. When IPv6 is disabled, a remote attacker can trigger a system crash by injecting a specially crafted IPv6 packet into the network interface. This vulnerability, a null pointer dereference, can lead to a denial of service."], "mitigation": {"lang": "en:us", "value": "Do not use the ipv6.disable=1 boot parameter on systems using VXLAN, or avoid VXLAN when IPv6 is disabled."}, "name": "CVE-2026-23293", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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": "2026-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23293\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23293\nhttps://lore.kernel.org/linux-cve-announce/2026032525-CVE-2026-23293-b422@gregkh/T"], "statement": "This flaw affects systems using VXLAN while IPv6 is explicitly disabled via the ipv6.disable=1 boot parameter. When an IPv6 packet reaches the VXLAN interface under these conditions, the uninitialized nd_tbl causes a NULL pointer dereference. This configuration (VXLAN with IPv6 disabled) is uncommon but could be present in specialized network deployments.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,b5190fcd75a1f1785c766a8d1e44d3938e168f45)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,5f93e6b4d12bd3a4517a6d447ea675f448f21434)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,f0373e9317bc904e7bdb123d3106fe4f3cea2fb7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,fbbd2118982c55fb9b0a753ae0cf7194e77149fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,abcd48ecdeb2e12eccb8339a35534c757782afcd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e15a00aafa4b7953ad717d3cb1ad7acf4ff76945,168ff39e4758897d2eee4756977d036d52884c7e)"}}], "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": "generic", "value": "3.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.77,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.17,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.7,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0-rc3,*]"}}], "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": "2026-03-25T21:15:37.501989+00:00", "updated": "2026-05-29T17:15:04.229502+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}