### [CVE-2024-50040](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50040)
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### Description

In the Linux kernel, the following vulnerability has been resolved:igb: Do not bring the device up after non-fatal errorCommit 004d25060c78 ("igb: Fix igb_down hung on surprise removal")changed igb_io_error_detected() to ignore non-fatal pcie errors in orderto avoid hung task that can happen when igb_down() is called multipletimes. This caused an issue when processing transient non-fatal errors.igb_io_resume(), which is called after igb_io_error_detected(), assumesthat device is brought down by igb_io_error_detected() if the interfaceis up. This resulted in panic with stacktrace below.[ T3256] igb 0000:09:00.0 haeth0: igb: haeth0 NIC Link is Down[  T292] pcieport 0000:00:1c.5: AER: Uncorrected (Non-Fatal) error received: 0000:09:00.0[  T292] igb 0000:09:00.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), type=Transaction Layer, (Requester ID)[  T292] igb 0000:09:00.0:   device [8086:1537] error status/mask=00004000/00000000[  T292] igb 0000:09:00.0:    [14] CmpltTO [  200.105524,009][  T292] igb 0000:09:00.0: AER:   TLP Header: 00000000 00000000 00000000 00000000[  T292] pcieport 0000:00:1c.5: AER: broadcast error_detected message[  T292] igb 0000:09:00.0: Non-correctable non-fatal error reported.[  T292] pcieport 0000:00:1c.5: AER: broadcast mmio_enabled message[  T292] pcieport 0000:00:1c.5: AER: broadcast resume message[  T292] ------------[ cut here ]------------[  T292] kernel BUG at net/core/dev.c:6539![  T292] invalid opcode: 0000 [#1] PREEMPT SMP[  T292] RIP: 0010:napi_enable+0x37/0x40[  T292] Call Trace:[  T292]  <TASK>[  T292]  ? die+0x33/0x90[  T292]  ? do_trap+0xdc/0x110[  T292]  ? napi_enable+0x37/0x40[  T292]  ? do_error_trap+0x70/0xb0[  T292]  ? napi_enable+0x37/0x40[  T292]  ? napi_enable+0x37/0x40[  T292]  ? exc_invalid_op+0x4e/0x70[  T292]  ? napi_enable+0x37/0x40[  T292]  ? asm_exc_invalid_op+0x16/0x20[  T292]  ? napi_enable+0x37/0x40[  T292]  igb_up+0x41/0x150[  T292]  igb_io_resume+0x25/0x70[  T292]  report_resume+0x54/0x70[  T292]  ? report_frozen_detected+0x20/0x20[  T292]  pci_walk_bus+0x6c/0x90[  T292]  ? aer_print_port_info+0xa0/0xa0[  T292]  pcie_do_recovery+0x22f/0x380[  T292]  aer_process_err_devices+0x110/0x160[  T292]  aer_isr+0x1c1/0x1e0[  T292]  ? disable_irq_nosync+0x10/0x10[  T292]  irq_thread_fn+0x1a/0x60[  T292]  irq_thread+0xe3/0x1a0[  T292]  ? irq_set_affinity_notifier+0x120/0x120[  T292]  ? irq_affinity_notify+0x100/0x100[  T292]  kthread+0xe2/0x110[  T292]  ? kthread_complete_and_exit+0x20/0x20[  T292]  ret_from_fork+0x2d/0x50[  T292]  ? kthread_complete_and_exit+0x20/0x20[  T292]  ret_from_fork_asm+0x11/0x20[  T292]  </TASK>To fix this issue igb_io_resume() checks if the interface is running andthe device is not down this means igb_io_error_detected() did not bringthe device down and there is no need to bring it up.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/w4zu/Debian_security