{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74523", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.911Z", "datePublished": "2026-08-15T12:27:40.575Z", "dateUpdated": "2026-08-19T16:38:27.388Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:27.388Z" }, "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's own mutex:\n\n qede_sp_task\n rtnl_lock()\n mutex_lock(&edev->qede_lock) <- taken\n qede_recovery_handler\n qede_load\n udp_tunnel_nic_reset_ntf\n __udp_tunnel_nic_device_sync\n info->sync_table == qede_udp_tunnel_sync\n mutex_lock(&edev->qede_lock) <- 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." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/qlogic/qede/qede_main.c" ], "versions": [ { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "19e505ee8bb9e0f0355eda9e9f614fb25fed0070", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "c4c1e5d6bc2b900b2328d6fff93dc8146b858d69", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "8e1bdf57de91247e57816482966265ada573cc74", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "e382a4efeeae6555b95d9ff336cf3094ee7d336b", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "4626df3f63c9185efba5750fe76ac01ab3351bae", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "e51becb8f3377a377171ed5bf0082b96e22e6292", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27", "status": "affected", "versionType": "git" }, { "version": "8cd160a29415f1789d473b1dc07fcc9d02a02b87", "lessThan": "451c9075d6c53f2438d110addbeeeea6fac18567", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/qlogic/qede/qede_main.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/19e505ee8bb9e0f0355eda9e9f614fb25fed0070" }, { "url": "https://git.kernel.org/stable/c/c4c1e5d6bc2b900b2328d6fff93dc8146b858d69" }, { "url": "https://git.kernel.org/stable/c/8e1bdf57de91247e57816482966265ada573cc74" }, { "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" } ], "title": "qede: sync udp_tunnel ports outside qede_lock in the recovery path", "x_generator": { "engine": "bippy-1.2.0" } } } }