{"id":"CVE-2026-74523","summary":"qede: sync udp_tunnel ports outside qede_lock in the recovery path","details":"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-\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(&edev-\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.","modified":"2026-08-18T03:56:50.651543418Z","published":"2026-08-15T12:27:40.575Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74523.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/451c9075d6c53f2438d110addbeeeea6fac18567"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4626df3f63c9185efba5750fe76ac01ab3351bae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e382a4efeeae6555b95d9ff336cf3094ee7d336b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e51becb8f3377a377171ed5bf0082b96e22e6292"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74523.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74523"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8cd160a29415f1789d473b1dc07fcc9d02a02b87"},{"fixed":"e382a4efeeae6555b95d9ff336cf3094ee7d336b"},{"fixed":"4626df3f63c9185efba5750fe76ac01ab3351bae"},{"fixed":"e51becb8f3377a377171ed5bf0082b96e22e6292"},{"fixed":"6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27"},{"fixed":"451c9075d6c53f2438d110addbeeeea6fac18567"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74523.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74523.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}