# CVE-2021-47283: linux: In the Linux kernel, the following vulnerability has been resolved:  net:sfc: fix non-freed irq in legacy irq mode  S...

CVE-2021-47283 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47283, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47283
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net:sfc: fix non-freed irq in legacy irq mode  SFC driver can be configured via modparam to work using MSI-X, MSI or legacy IRQ interrupts. In the last one, the interrupt was not properly released on module remove.  It was not freed because the flag irqs_hooked was not set during initialization in the case of using legacy IRQ.  Example of (trimmed) trace during module remove without this fix:  remove_proc_entry: removing non-empty directory 'irq/125', leaking at least '0000:3b:00.1' WARNING: CPU: 39 PID: 3658 at fs/proc/generic.c:715 remove_proc_entry+0x15c/0x170 ...trimmed... Call Trace:  unregister_irq_proc+0xe3/0x100  free_desc+0x29/0x70  irq_free_descs+0x47/0x70  mp_unmap_irq+0x58/0x60  acpi_unregister_gsi_ioapic+0x2a/0x40  acpi_pci_irq_disable+0x78/0xb0  pci_disable_device+0xd1/0x100  efx_pci_remove+0xa1/0x1e0 [sfc]  pci_device_remove+0x38/0xa0  __device_release_driver+0x177/0x230  driver_detach+0xcb/0x110  bus_remove_driver+0x58/0xd0  pci_unregister_driver+0x2a/0xb0  efx_exit_module+0x24/0xf40 [sfc]  __do_sys_delete_module.constprop.0+0x171/0x280  ? exit_to_user_mode_prepare+0x83/0x1d0  do_syscall_64+0x3d/0x80  entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9f9385800b ...trimmed...

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47283](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47283.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47283](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47283.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47283](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47283.md) | May 21, 2024 |

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