CVE-2022-49295

nbd: call genl_unregister_family() first in nbd_cleanup()

State: Published
Severity: 7.0 High
Published: Feb 26, 2025
Updated: Aug 5, 2026
Reserved: 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-)

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	4.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 8a1435c862ea09b06be7acda325128dc08458e25Affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5cAffected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 1be608e1ee1f222464b2856bda9b85ab5184a33eAffected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before c0868f6e728c3c28bef0e8bee89d2daf86a8bbcaAffected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before cbeafa7a79d08ecdb55f8f1d41a11323d0f709dbAffected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 6f505bbb8063fd3a238a4239d2d8c165e5279f6fAffected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79Affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 06c4da89c24e7023ea448cadf8e9daf06a0aae6eAffected
LinuxLinux	4.12Affected before 4.12Not affected 4.14.283 through 4.14.Not affected 4.19.247 through 4.19.Not affected 5.4.198 through 5.4.Not affected 5.10.122 through 5.10.Not affected 5.15.47 through 5.15.Not affected 5.17.15 through 5.17.Not affected 5.18.4 through 5.18.*Not affected 5.19 and laterNot affected

Product

Versions

LinuxLinux

e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 8a1435c862ea09b06be7acda325128dc08458e25Affected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5cAffected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 1be608e1ee1f222464b2856bda9b85ab5184a33eAffected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before c0868f6e728c3c28bef0e8bee89d2daf86a8bbcaAffected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before cbeafa7a79d08ecdb55f8f1d41a11323d0f709dbAffected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 6f505bbb8063fd3a238a4239d2d8c165e5279f6fAffected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79Affected
e46c7287b1c27683a8e30ca825fb98e2b97f1099 to before 06c4da89c24e7023ea448cadf8e9daf06a0aae6eAffected

LinuxLinux

4.12Affected
before 4.12Not affected
4.14.283 through 4.14.*Not affected
4.19.247 through 4.19.*Not affected
5.4.198 through 5.4.*Not affected
5.10.122 through 5.10.*Not affected
5.15.47 through 5.15.*Not affected
5.17.15 through 5.17.*Not affected
5.18.4 through 5.18.*Not affected
5.19 and laterNot affected

References

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