# CVE-2022-49295: linux: In the Linux kernel, the following vulnerability has been resolved:  nbd: call genl_unregister_family() first in nbd_...

CVE-2022-49295 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49295, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49295
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  nbd: call genl_unregister_family() first in nbd_cleanup()  Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below:    BUG: kernel NULL pointer dereference, address: 0000000000000098   Oops: 0002 [#1] SMP PTI   CPU: 1 PID: 31299 Comm: nbd-client Tainted: G            E     5.14.0-rc4   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)   RIP: 0010:down_write+0x1a/0x50   Call Trace:    start_creating+0x89/0x130    debugfs_create_dir+0x1b/0x130    nbd_start_device+0x13d/0x390 [nbd]    nbd_genl_connect+0x42f/0x748 [nbd]    genl_family_rcv_msg_doit.isra.0+0xec/0x150    genl_rcv_msg+0xe5/0x1e0    netlink_rcv_skb+0x55/0x100    genl_rcv+0x29/0x40    netlink_unicast+0x1a8/0x250    netlink_sendmsg+0x21b/0x430    ____sys_sendmsg+0x2a4/0x2d0    ___sys_sendmsg+0x81/0xc0    __sys_sendmsg+0x62/0xb0    __x64_sys_sendmsg+0x1f/0x30    do_syscall_64+0x3b/0xc0    entry_SYSCALL_64_after_hwframe+0x44/0xae   Modules linked in: nbd(E-)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49295](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49295.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49295](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49295.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49295](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49295.md) | Feb 26, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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