Bug 2400618 (CVE-2025-39911)

Summary: CVE-2025-39911 kernel: i40e: fix IRQ freeing in i40e_vsi_request_irq_msix error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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Description OSIDB Bzimport 2025-10-01 08:02:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i40e: fix IRQ freeing in i40e_vsi_request_irq_msix error path

If request_irq() in i40e_vsi_request_irq_msix() fails in an iteration
later than the first, the error path wants to free the IRQs requested
so far. However, it uses the wrong dev_id argument for free_irq(), so
it does not free the IRQs correctly and instead triggers the warning:

 Trying to free already-free IRQ 173
 WARNING: CPU: 25 PID: 1091 at kernel/irq/manage.c:1829 __free_irq+0x192/0x2c0
 Modules linked in: i40e(+) [...]
 CPU: 25 UID: 0 PID: 1091 Comm: NetworkManager Not tainted 6.17.0-rc1+ #1 PREEMPT(lazy)
 Hardware name: [...]
 RIP: 0010:__free_irq+0x192/0x2c0
 [...]
 Call Trace:
  <TASK>
  free_irq+0x32/0x70
  i40e_vsi_request_irq_msix.cold+0x63/0x8b [i40e]
  i40e_vsi_request_irq+0x79/0x80 [i40e]
  i40e_vsi_open+0x21f/0x2f0 [i40e]
  i40e_open+0x63/0x130 [i40e]
  __dev_open+0xfc/0x210
  __dev_change_flags+0x1fc/0x240
  netif_change_flags+0x27/0x70
  do_setlink.isra.0+0x341/0xc70
  rtnl_newlink+0x468/0x860
  rtnetlink_rcv_msg+0x375/0x450
  netlink_rcv_skb+0x5c/0x110
  netlink_unicast+0x288/0x3c0
  netlink_sendmsg+0x20d/0x430
  ____sys_sendmsg+0x3a2/0x3d0
  ___sys_sendmsg+0x99/0xe0
  __sys_sendmsg+0x8a/0xf0
  do_syscall_64+0x82/0x2c0
  entry_SYSCALL_64_after_hwframe+0x76/0x7e
  [...]
  </TASK>
 ---[ end trace 0000000000000000 ]---

Use the same dev_id for free_irq() as for request_irq().

I tested this with inserting code to fail intentionally.
Comment 1 Alexander B 2025-10-02 11:29:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100110-CVE-2025-39911-5646@gregkh/T