--- 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' --- ## Overview 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 `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. ## Vendor advisories - **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) - **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) - **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) - **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) - **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) **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. Affected: - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 9 - Red Hat OpenShift Container Platform 4 Fixed: - 10Base-SMTV - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream (v. 9) - Red Hat Enterprise Linux BaseOS (v. 10) - Red Hat Enterprise Linux BaseOS (v. 8) - Red Hat Enterprise Linux BaseOS (v. 9) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) - Red Hat Enterprise Linux CRB (v. 8) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) - Red Hat Enterprise Linux Hidden (v. 10) - Red Hat Enterprise Linux Real Time for NFV (v. 10) - Red Hat Enterprise Linux NFV (v. 8) - Red Hat Enterprise Linux Real Time for NFV (v. 9) - Red Hat Enterprise Linux Real Time (v. 10) - Red Hat Enterprise Linux RT (v. 8) - Red Hat Enterprise Linux Real Time (v. 9) No fix planned: - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 9 - Red Hat OpenShift Container Platform 4 Not affected: - Red Hat Enterprise Linux 6 ## Remediation For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red 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. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76738 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red 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. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76739 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red 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. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:75747