{"id":"AZL-68043","summary":"CVE-2025-39911 affecting package kernel for versions less than 6.6.112.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: fix IRQ freeing in i40e_vsi_request_irq_msix error path\n\nIf request_irq() in i40e_vsi_request_irq_msix() fails in an iteration\nlater than the first, the error path wants to free the IRQs requested\nso far. However, it uses the wrong dev_id argument for free_irq(), so\nit does not free the IRQs correctly and instead triggers the warning:\n\n Trying to free already-free IRQ 173\n WARNING: CPU: 25 PID: 1091 at kernel/irq/manage.c:1829 __free_irq+0x192/0x2c0\n Modules linked in: i40e(+) [...]\n CPU: 25 UID: 0 PID: 1091 Comm: NetworkManager Not tainted 6.17.0-rc1+ #1 PREEMPT(lazy)\n Hardware name: [...]\n RIP: 0010:__free_irq+0x192/0x2c0\n [...]\n Call Trace:\n  \u003cTASK\u003e\n  free_irq+0x32/0x70\n  i40e_vsi_request_irq_msix.cold+0x63/0x8b [i40e]\n  i40e_vsi_request_irq+0x79/0x80 [i40e]\n  i40e_vsi_open+0x21f/0x2f0 [i40e]\n  i40e_open+0x63/0x130 [i40e]\n  __dev_open+0xfc/0x210\n  __dev_change_flags+0x1fc/0x240\n  netif_change_flags+0x27/0x70\n  do_setlink.isra.0+0x341/0xc70\n  rtnl_newlink+0x468/0x860\n  rtnetlink_rcv_msg+0x375/0x450\n  netlink_rcv_skb+0x5c/0x110\n  netlink_unicast+0x288/0x3c0\n  netlink_sendmsg+0x20d/0x430\n  ____sys_sendmsg+0x3a2/0x3d0\n  ___sys_sendmsg+0x99/0xe0\n  __sys_sendmsg+0x8a/0xf0\n  do_syscall_64+0x82/0x2c0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [...]\n  \u003c/TASK\u003e\n ---[ end trace 0000000000000000 ]---\n\nUse the same dev_id for free_irq() as for request_irq().\n\nI tested this with inserting code to fail intentionally.","modified":"2026-04-01T05:21:20.317897Z","published":"2025-10-01T08:15:34Z","upstream":["CVE-2025-39911"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39911"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.112.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-68043.json"}}],"schema_version":"1.7.5"}