{"id":"CVE-2026-68432","title":"kernel: vxlan: require CAP_NET_ADMIN in the device netns for changelink (CVE-2026-68432)","summary":"A flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) implementation. A local attacker, with `CAP_NET_ADMIN` (network administration capability) in one network namespace, could exploit an incorrect privilege check in the `r…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-266","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 7","enterprise_linux 9","openshift_container_platform 4","10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8","enterprise_linux_real_time_v_9"],"patched":["10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8","enterprise_linux_real_time_v_9"],"published":"2026-08-12","updated":"2026-10-26","sourceUpdated":"2026-10-26T09:33:04+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68432.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68432.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-68432"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514441"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68432"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68432"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081254-CVE-2026-68432-30f2@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:76738"},{"url":"https://access.redhat.com/errata/RHSA-2026:76739"},{"url":"https://access.redhat.com/errata/RHSA-2026:75747"},{"url":"https://access.redhat.com/errata/RHSA-2026:75746"},{"url":"https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0"},{"url":"https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a"},{"url":"https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed"},{"url":"https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5"},{"url":"https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f"},{"url":"https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6"},{"url":"https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87"},{"url":"https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00146,"epssPercentile":0.03827,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:48:52.480523Z"},"scores":{"vendor":7,"cna":8.8},"ingestedAt":"2026-10-16T17:24:46.866Z","slug":"CVE-2026-68432","body":"## Overview\n\nA flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) implementation. A local attacker, with `CAP_NET_ADMIN` (network administration capability) in one network namespace, could exploit an incorrect privilege check in the `rtnl changelink` path. This allows the attacker to modify the configuration of a VXLAN device whose underlying network interface resides in a different network namespace where the attacker lacks the necessary privileges, potentially leading to unauthorized network configuration changes.\n\n## Vendor advisories\n\n- **RHSA-2026:76738** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76738)\n- **RHSA-2026:76739** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76739)\n- **RHSA-2026:75747** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75747)\n- **RHSA-2026:75746** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75746)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68432.json)\n\n**kernel: vxlan: require CAP_NET_ADMIN in the device netns for changelink** — rated Important by Red Hat. Released 2026-08-12, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nFixed:\n\n- 10Base-SMTV\n- Red Hat Enterprise Linux AppStream (v. 10)\n- Red Hat Enterprise Linux AppStream (v. 9)\n- Red Hat Enterprise Linux BaseOS (v. 10)\n- Red Hat Enterprise Linux BaseOS (v. 8)\n- Red Hat Enterprise Linux BaseOS (v. 9)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)\n- Red Hat Enterprise Linux CRB (v. 8)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)\n- Red Hat Enterprise Linux Hidden (v. 10)\n- Red Hat Enterprise Linux Real Time for NFV (v. 10)\n- Red Hat Enterprise Linux NFV (v. 8)\n- Red Hat Enterprise Linux Real Time for NFV (v. 9)\n- Red Hat Enterprise Linux Real Time (v. 10)\n- Red Hat Enterprise Linux RT (v. 8)\n- Red Hat Enterprise Linux Real Time (v. 9)\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76738\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76739\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:75747","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229355,"id":"CVE-2026-68432","ts":1793019709487,"field":"cvss","old":"8.8","new":"7"}]}