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CVE-2026-74523 (GCVE-0-2026-74523)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
qede: sync udp_tunnel ports outside qede_lock in the recovery path
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < 19e505ee8bb9e0f0355eda9e9f614fb25fed0070 (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < c4c1e5d6bc2b900b2328d6fff93dc8146b858d69 (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < 8e1bdf57de91247e57816482966265ada573cc74 (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < e382a4efeeae6555b95d9ff336cf3094ee7d336b (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < 4626df3f63c9185efba5750fe76ac01ab3351bae (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < e51becb8f3377a377171ed5bf0082b96e22e6292 (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < 6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27 (git)
Affected: 8cd160a29415f1789d473b1dc07fcc9d02a02b87 , < 451c9075d6c53f2438d110addbeeeea6fac18567 (git)
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Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
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          "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."
        }
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      "metrics": [
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          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "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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        "dateUpdated": "2026-08-19T16:38:27.388Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/451c9075d6c53f2438d110addbeeeea6fac18567"
        }
      ],
      "title": "qede: sync udp_tunnel ports outside qede_lock in the recovery path",
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    "cveId": "CVE-2026-74523",
    "datePublished": "2026-08-15T12:27:40.575Z",
    "dateReserved": "2026-08-15T05:44:03.911Z",
    "dateUpdated": "2026-08-19T16:38:27.388Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74523",
      "date": "2026-09-10",
      "epss": "0.00501",
      "percentile": "0.41296"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:50:13.000Z",
      "cve": "CVE-2026-74523",
      "id": "msrc_CVE-2026-74523",
      "initial_release_date": "2026-08-23T15:03:04.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "qede: sync udp_tunnel ports outside qede_lock in the recovery path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74523.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74523\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:57.543\",\"lastModified\":\"2026-08-19T17:21:09.017\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/qlogic/qede/qede_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"19e505ee8bb9e0f0355eda9e9f614fb25fed0070\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"c4c1e5d6bc2b900b2328d6fff93dc8146b858d69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"8e1bdf57de91247e57816482966265ada573cc74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"e382a4efeeae6555b95d9ff336cf3094ee7d336b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"4626df3f63c9185efba5750fe76ac01ab3351bae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"e51becb8f3377a377171ed5bf0082b96e22e6292\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cd160a29415f1789d473b1dc07fcc9d02a02b87\",\"lessThan\":\"451c9075d6c53f2438d110addbeeeea6fac18567\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/qlogic/qede/qede_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19e505ee8bb9e0f0355eda9e9f614fb25fed0070\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/451c9075d6c53f2438d110addbeeeea6fac18567\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4626df3f63c9185efba5750fe76ac01ab3351bae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e1bdf57de91247e57816482966265ada573cc74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4c1e5d6bc2b900b2328d6fff93dc8146b858d69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e382a4efeeae6555b95d9ff336cf3094ee7d336b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e51becb8f3377a377171ed5bf0082b96e22e6292\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T11:33:12+00:00",
      "cve": "CVE-2026-74523",
      "id": "CVE-2026-74523",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: qede: sync udp_tunnel ports outside qede_lock in the recovery path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74523.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:40:18Z",
      "cve": "CVE-2026-74523",
      "id": "CVE-2026-74523",
      "initial_release_date": "2026-08-15T23:51:03Z",
      "product_status:known_affected": "223",
      "product_status:known_not_affected": "61",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74523",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74523.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.