CVE-2026-74523 (GCVE-0-2026-74523)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-10-16 19:05
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: qede: sync udp_tunnel ports outside qede_lock in the recovery path A TX timeout on a qede NIC that has VXLAN/GENEVE tunnel ports configured wedges the rtnetlink control plane of the whole machine: NETDEV WATCHDOG: ens6f1 (qede): transmit queue 2 timed out 10226 ms [qede_tx_timeout:586(ens6f1)]TX timeout on queue 2! [qede_recovery_handler:2665(ens6f0)]Starting a recovery process The recovery path deadlocks on the driver's own mutex: qede_sp_task rtnl_lock() mutex_lock(&edev->qede_lock) <- taken qede_recovery_handler qede_load udp_tunnel_nic_reset_ntf __udp_tunnel_nic_device_sync info->sync_table == qede_udp_tunnel_sync mutex_lock(&edev->qede_lock) <- same task: deadlock The mutex is not recursive, so the kworker blocks on itself with rtnl_lock held, and neither lock is ever released. Every task that calls rtnl_lock() afterwards (ip, ovs-vswitchd, lldpad, IPv6 addrconf, sshd) blocks forever while the node still answers ping. In a vmcore from an affected production node rtnl_mutex.owner decodes to the very kworker blocked at the innermost mutex_lock() above. Re-sync the tunnel ports from qede_sp_task() after the internal lock is dropped, still under rtnl_lock as the udp_tunnel API requires. This mirrors qede_open(), which calls udp_tunnel_nic_reset_ntf() under rtnl without the internal lock. qede_recovery_handler() now returns whether it has successfully reloaded an open device, and the caller re-syncs the ports only in that case. This keeps the old gating exactly: a device that was down or a failed recovery returns false, as those paths never reached the udp_tunnel_nic_reset_ntf() call before either. This was the only user of the qede_lock()/qede_unlock() helpers, so remove them.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
Version: 8cd160a29415f1789d473b1dc07fcc9d02a02b87
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nqede: sync udp_tunnel ports outside qede_lock in the recovery path\n\nA TX timeout on a qede NIC that has VXLAN/GENEVE tunnel ports\nconfigured wedges the rtnetlink control plane of the whole machine:\n\n  NETDEV WATCHDOG: ens6f1 (qede): transmit queue 2 timed out 10226 ms\n  [qede_tx_timeout:586(ens6f1)]TX timeout on queue 2!\n  [qede_recovery_handler:2665(ens6f0)]Starting a recovery process\n\nThe recovery path deadlocks on the driver\u0027s own mutex:\n\n  qede_sp_task\n   rtnl_lock()\n   mutex_lock(\u0026edev-\u003eqede_lock)        \u003c- taken\n   qede_recovery_handler\n    qede_load\n    udp_tunnel_nic_reset_ntf\n     __udp_tunnel_nic_device_sync\n      info-\u003esync_table == qede_udp_tunnel_sync\n       mutex_lock(\u0026edev-\u003eqede_lock)    \u003c- same task: deadlock\n\nThe mutex is not recursive, so the kworker blocks on itself with\nrtnl_lock held, and neither lock is ever released. Every task that\ncalls rtnl_lock() afterwards (ip, ovs-vswitchd, lldpad, IPv6\naddrconf, sshd) blocks forever while the node still answers ping.\nIn a vmcore from an affected production node rtnl_mutex.owner\ndecodes to the very kworker blocked at the innermost mutex_lock()\nabove.\n\nRe-sync the tunnel ports from qede_sp_task() after the internal lock\nis dropped, still under rtnl_lock as the udp_tunnel API requires.\nThis mirrors qede_open(), which calls udp_tunnel_nic_reset_ntf()\nunder rtnl without the internal lock.\n\nqede_recovery_handler() now returns whether it has successfully\nreloaded an open device, and the caller re-syncs the ports only in\nthat case. This keeps the old gating exactly: a device that was down\nor a failed recovery returns false, as those paths never reached the\nudp_tunnel_nic_reset_ntf() call before either.\n\nThis was the only user of the qede_lock()/qede_unlock() helpers, so\nremove them."
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              "value": "AV:N - The bug is reached from the qede NIC firmware error-recovery path triggered by network-driven faults (e.g., TX queue watchdog timeout on traffic-bearing queues); remote packets to an internet-facing qede host can induce recovery without local syscall access.\nAC:L - Once qede recovery runs on an interface with VXLAN/GENEVE ports registered, the nested qede_lock while rtnl_lock is held deadlocks deterministically; attackers can repeatedly apply traffic/load patterns to provoke TX timeout and firmware ERROR_RECOVERY.\nPR:N - Exploitation requires only the ability to send network traffic that provokes NIC recovery on a target that already has VXLAN/GENEVE offloads configured (normal on cloud/DC qede nodes); no attacker privileges or rtnetlink configuration are needed.\nUI:N - No victim interaction is required beyond routine use of a server whose qede uplink already runs overlay networking; the attacker does not need the victim to mount, open, or approve anything at exploit time.\nS:U - Impact is a kernel networking control-plane deadlock within the same host/kernel trust boundary; it does not cross VM, container, or IOMMU security domains to affect other authorities.\nC:N - This is a locking deadlock with no memory corruption, out-of-bounds access, use-after-free, or information disclosure; only mutex/RTNL state is wedged.\nI:N - The flaw does not modify data or achieve code execution; it only blocks threads waiting on rtnl_lock/qede_lock without altering memory contents or kernel objects beyond stalled lock state.\nA:H - The deadlock holds rtnl_lock indefinitely, freezing system-wide network reconfiguration and management (ip, ovs-vswitchd, sshd addr setup) until reboot; per CVSS guidance, kernel deadlocks that deny critical availability are rated High."
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    "datePublished": "2026-08-15T12:27:40.575Z",
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    "dateUpdated": "2026-10-16T19:05:52.869Z",
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{\"url\": \"https://git.kernel.org/stable/c/e382a4efeeae6555b95d9ff336cf3094ee7d336b\"}, {\"url\": \"https://git.kernel.org/stable/c/4626df3f63c9185efba5750fe76ac01ab3351bae\"}, {\"url\": \"https://git.kernel.org/stable/c/e51becb8f3377a377171ed5bf0082b96e22e6292\"}, {\"url\": \"https://git.kernel.org/stable/c/6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27\"}, {\"url\": \"https://git.kernel.org/stable/c/451c9075d6c53f2438d110addbeeeea6fac18567\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nqede: sync udp_tunnel ports outside qede_lock in the recovery path\\n\\nA TX timeout on a qede NIC that has VXLAN/GENEVE tunnel ports\\nconfigured wedges the rtnetlink control plane of the whole machine:\\n\\n  NETDEV WATCHDOG: ens6f1 (qede): transmit queue 2 timed out 10226 ms\\n  [qede_tx_timeout:586(ens6f1)]TX timeout on queue 2!\\n  [qede_recovery_handler:2665(ens6f0)]Starting a recovery process\\n\\nThe recovery path deadlocks on the driver\u0027s own mutex:\\n\\n  qede_sp_task\\n   rtnl_lock()\\n   mutex_lock(\u0026edev-\u003eqede_lock)        \u003c- taken\\n   qede_recovery_handler\\n    qede_load\\n    udp_tunnel_nic_reset_ntf\\n     __udp_tunnel_nic_device_sync\\n      info-\u003esync_table == qede_udp_tunnel_sync\\n       mutex_lock(\u0026edev-\u003eqede_lock)    \u003c- same task: deadlock\\n\\nThe mutex is not recursive, so the kworker blocks on itself with\\nrtnl_lock held, and neither lock is ever released. Every task that\\ncalls rtnl_lock() afterwards (ip, ovs-vswitchd, lldpad, IPv6\\naddrconf, sshd) blocks forever while the node still answers ping.\\nIn a vmcore from an affected production node rtnl_mutex.owner\\ndecodes to the very kworker blocked at the innermost mutex_lock()\\nabove.\\n\\nRe-sync the tunnel ports from qede_sp_task() after the internal lock\\nis dropped, still under rtnl_lock as the udp_tunnel API requires.\\nThis mirrors qede_open(), which calls udp_tunnel_nic_reset_ntf()\\nunder rtnl without the internal lock.\\n\\nqede_recovery_handler() now returns whether it has successfully\\nreloaded an open device, and the caller re-syncs the ports only in\\nthat case. This keeps the old gating exactly: a device that was down\\nor a failed recovery returns false, as those paths never reached the\\nudp_tunnel_nic_reset_ntf() call before either.\\n\\nThis was the only user of the qede_lock()/qede_unlock() helpers, so\\nremove them.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.103\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.44\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.8\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:38:27.388Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74523\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:05:52.869Z\", \"dateReserved\": \"2026-08-15T05:44:03.911Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T12:27:40.575Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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