CVE-2026-23209 (GCVE-0-2026-23209)
Vulnerability from cvelistv5
Published
2026-02-14 16:27
Modified
2026-08-05 12:20
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix error recovery in macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 ping -c1 -I p1 1.2.3.4 He also gave a very detailed analysis: <quote valis> The issue is triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called from macvlan_common_newlink() fails (e.g. because of the invalid link name). In this case macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink(): This adds a reference to vlan to the port's vlan_source_hash using macvlan_source_entry. vlan is a pointer to the priv data of the link that is being created. When register_netdevice() fails, the error is returned from macvlan_newlink() to rtnl_newlink_create(): if (ops->newlink) err = ops->newlink(dev, &params, extack); else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; } and free_netdev() is called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached to the lower device's macvlan port. Now all packets sent on the macvlan port with a matching source mac address will trigger a use-after-free in macvlan_forward_source(). </quote valis> With all that, my fix is to make sure we call macvlan_flush_sources() regardless of @create value whenever "goto destroy_macvlan_port;" path is taken. Many thanks to valis for following up on this issue.
References
Impacted products
Vendor Product Version
Linux Linux Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
Version: aa5fd0fb77486b8a6764ead8627baa14790e4280
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix error recovery in macvlan_common_newlink()\n\nvalis provided a nice repro to crash the kernel:\n\nip link add p1 type veth peer p2\nip link set address 00:00:00:00:00:20 dev p1\nip link set up dev p1\nip link set up dev p2\n\nip link add mv0 link p2 type macvlan mode source\nip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20\n\nping -c1 -I p1 1.2.3.4\n\nHe also gave a very detailed analysis:\n\n\u003cquote valis\u003e\n\nThe issue is triggered when a new macvlan link is created  with\nMACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or\nMACVLAN_MACADDR_SET) parameter, lower device already has a macvlan\nport and register_netdevice() called from macvlan_common_newlink()\nfails (e.g. because of the invalid link name).\n\nIn this case macvlan_hash_add_source is called from\nmacvlan_change_sources() / macvlan_common_newlink():\n\nThis adds a reference to vlan to the port\u0027s vlan_source_hash using\nmacvlan_source_entry.\n\nvlan is a pointer to the priv data of the link that is being created.\n\nWhen register_netdevice() fails, the error is returned from\nmacvlan_newlink() to rtnl_newlink_create():\n\n        if (ops-\u003enewlink)\n                err = ops-\u003enewlink(dev, \u0026params, extack);\n        else\n                err = register_netdevice(dev);\n        if (err \u003c 0) {\n                free_netdev(dev);\n                goto out;\n        }\n\nand free_netdev() is called, causing a kvfree() on the struct\nnet_device that is still referenced in the source entry attached to\nthe lower device\u0027s macvlan port.\n\nNow all packets sent on the macvlan port with a matching source mac\naddress will trigger a use-after-free in macvlan_forward_source().\n\n\u003c/quote valis\u003e\n\nWith all that, my fix is to make sure we call macvlan_flush_sources()\nregardless of @create value whenever \"goto destroy_macvlan_port;\"\npath is taken.\n\nMany thanks to valis for following up on this issue."
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              "value": "AV:L - Triggering the vulnerability requires CAP_NET_ADMIN to create macvlan interfaces, which is reachable via user namespaces (unshare -Urn) by an unprivileged local user. The setup is local even though the UAF is triggered by network packets.\nAC:L - The vulnerability is deterministically triggered by a straightforward sequence: create a macvlan source with a known-bad interface name to cause register_netdevice() failure, then send a packet with the matching source MAC. No race condition or special conditions needed.\nPR:L - Requires CAP_NET_ADMIN for RTM_NEWLINK netlink operations, but this capability is obtainable by any unprivileged user through user namespaces (unshare -Urn), as netlink_net_capable checks against the network namespace\u0027s user_ns, not init_user_ns.\nUI:N - No user interaction is needed. The attacker sets up the vulnerable macvlan configuration and triggers the UAF by sending packets on the lower device, all without any victim action.\nS:U - The vulnerability operates within the kernel\u0027s security context. While it allows kernel code execution, it does not cross a virtualization or sandbox boundary \u2014 it is standard kernel privilege escalation.\nC:H - The use-after-free in macvlan_forward_source() dereferences a freed macvlan_dev structure. An attacker can reclaim the freed memory via heap spraying, enabling arbitrary kernel memory reads through controlled object contents.\nI:H - The UAF accesses and writes to the freed macvlan_dev structure (e.g., macvlan_count_rx updates statistics). With heap spraying to reclaim the freed object, this provides arbitrary write primitives that can be leveraged for code execution.\nA:H - The use-after-free causes dereferencing of freed memory, which reliably causes kernel crashes (oops/panic) when the freed memory is reclaimed for other purposes. The reproducer in the commit message demonstrates a reliable crash."
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    "dateUpdated": "2026-08-05T12:20:40.203Z",
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The setup is local even though the UAF is triggered by network packets.\\nAC:L - The vulnerability is deterministically triggered by a straightforward sequence: create a macvlan source with a known-bad interface name to cause register_netdevice() failure, then send a packet with the matching source MAC. No race condition or special conditions needed.\\nPR:L - Requires CAP_NET_ADMIN for RTM_NEWLINK netlink operations, but this capability is obtainable by any unprivileged user through user namespaces (unshare -Urn), as netlink_net_capable checks against the network namespace\u0027s user_ns, not init_user_ns.\\nUI:N - No user interaction is needed. The attacker sets up the vulnerable macvlan configuration and triggers the UAF by sending packets on the lower device, all without any victim action.\\nS:U - The vulnerability operates within the kernel\u0027s security context. 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\"https://git.kernel.org/stable/c/c43d0e787cbba569ec9d11579ed370b50fab6c9c\"}, {\"url\": \"https://git.kernel.org/stable/c/11ba9f0dc865136174cb98834280fb21bbc950c7\"}, {\"url\": \"https://git.kernel.org/stable/c/986967a162142710076782d5b93daab93a892980\"}, {\"url\": \"https://git.kernel.org/stable/c/cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66\"}, {\"url\": \"https://git.kernel.org/stable/c/f8db6475a83649689c087a8f52486fcc53e627e9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmacvlan: fix error recovery in macvlan_common_newlink()\\n\\nvalis provided a nice repro to crash the kernel:\\n\\nip link add p1 type veth peer p2\\nip link set address 00:00:00:00:00:20 dev p1\\nip link set up dev p1\\nip link set up dev p2\\n\\nip link add mv0 link p2 type macvlan mode source\\nip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20\\n\\nping -c1 -I p1 1.2.3.4\\n\\nHe also gave a very detailed analysis:\\n\\n\u003cquote valis\u003e\\n\\nThe issue is triggered when a new macvlan link is created  with\\nMACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or\\nMACVLAN_MACADDR_SET) parameter, lower device already has a macvlan\\nport and register_netdevice() called from macvlan_common_newlink()\\nfails (e.g. because of the invalid link name).\\n\\nIn this case macvlan_hash_add_source is called from\\nmacvlan_change_sources() / macvlan_common_newlink():\\n\\nThis adds a reference to vlan to the port\u0027s vlan_source_hash using\\nmacvlan_source_entry.\\n\\nvlan is a pointer to the priv data of the link that is being created.\\n\\nWhen register_netdevice() fails, the error is returned from\\nmacvlan_newlink() to rtnl_newlink_create():\\n\\n        if (ops-\u003enewlink)\\n                err = ops-\u003enewlink(dev, \u0026params, extack);\\n        else\\n                err = register_netdevice(dev);\\n        if (err \u003c 0) {\\n                free_netdev(dev);\\n                goto out;\\n        }\\n\\nand free_netdev() is called, causing a kvfree() on the struct\\nnet_device that is still referenced in the source entry attached to\\nthe lower device\u0027s macvlan port.\\n\\nNow all packets sent on the macvlan port with a matching source mac\\naddress will trigger a use-after-free in macvlan_forward_source().\\n\\n\u003c/quote valis\u003e\\n\\nWith all that, my fix is to make sure we call macvlan_flush_sources()\\nregardless of @create value whenever \\\"goto destroy_macvlan_port;\\\"\\npath is taken.\\n\\nMany thanks to valis for following up on this issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.250\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.200\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.163\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.124\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.70\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.10\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:20:40.203Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23209\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:20:40.203Z\", \"dateReserved\": \"2026-01-13T15:37:45.986Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-02-14T16:27:31.175Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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