{"id":"CVE-2026-74523","state":"PUBLISHED","title":"qede: sync udp_tunnel ports outside qede_lock in the recovery path","description":"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.","publishedAt":"2026-08-15T12:27:40.575Z","updatedAt":"2026-10-16T19:05:52.869Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"19e505ee8bb9e0f0355eda9e9f614fb25fed0070","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"c4c1e5d6bc2b900b2328d6fff93dc8146b858d69","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"8e1bdf57de91247e57816482966265ada573cc74","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"e382a4efeeae6555b95d9ff336cf3094ee7d336b","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"4626df3f63c9185efba5750fe76ac01ab3351bae","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"e51becb8f3377a377171ed5bf0082b96e22e6292","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"451c9075d6c53f2438d110addbeeeea6fac18567","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/qlogic/qede/qede_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/qlogic/qede/qede_main.c"]}],"references":["https://git.kernel.org/stable/c/19e505ee8bb9e0f0355eda9e9f614fb25fed0070","https://git.kernel.org/stable/c/c4c1e5d6bc2b900b2328d6fff93dc8146b858d69","https://git.kernel.org/stable/c/8e1bdf57de91247e57816482966265ada573cc74","https://git.kernel.org/stable/c/e382a4efeeae6555b95d9ff336cf3094ee7d336b","https://git.kernel.org/stable/c/4626df3f63c9185efba5750fe76ac01ab3351bae","https://git.kernel.org/stable/c/e51becb8f3377a377171ed5bf0082b96e22e6292","https://git.kernel.org/stable/c/6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27","https://git.kernel.org/stable/c/451c9075d6c53f2438d110addbeeeea6fac18567"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74523.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74523","state":"PUBLISHED","datePublished":"2026-08-15T12:27:40.575Z","dateUpdated":"2026-10-16T19:05:52.869Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.911Z"},"containers":{"cna":{"title":"qede: sync udp_tunnel ports outside qede_lock in the recovery path","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"19e505ee8bb9e0f0355eda9e9f614fb25fed0070","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"c4c1e5d6bc2b900b2328d6fff93dc8146b858d69","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"8e1bdf57de91247e57816482966265ada573cc74","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"e382a4efeeae6555b95d9ff336cf3094ee7d336b","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"4626df3f63c9185efba5750fe76ac01ab3351bae","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"e51becb8f3377a377171ed5bf0082b96e22e6292","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27","versionType":"git"},{"version":"8cd160a29415f1789d473b1dc07fcc9d02a02b87","status":"affected","lessThan":"451c9075d6c53f2438d110addbeeeea6fac18567","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/qlogic/qede/qede_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/qlogic/qede/qede_main.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:38:27.388Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74523","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T18:59:07.418597Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:52.869Z"}}]}}}