CVE-2022-49295
nbd: call genl_unregister_family() first in nbd_cleanup()
- Published
- Updated
- Reserved
- Assigned by
- Linux
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-)
Timeline
ID reserved
By Linux
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CISA-ADPADP (enrichment) | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Weakness
Affected products
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 8a1435c862ea09b06be7acda325128dc08458e25
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 1be608e1ee1f222464b2856bda9b85ab5184a33e
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < c0868f6e728c3c28bef0e8bee89d2daf86a8bbca
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < cbeafa7a79d08ecdb55f8f1d41a11323d0f709db
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 6f505bbb8063fd3a238a4239d2d8c165e5279f6f
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79
- affected e46c7287b1c27683a8e30ca825fb98e2b97f1099 – < 06c4da89c24e7023ea448cadf8e9daf06a0aae6e
- affected 4.12
- unaffected < 4.12
- unaffected 4.14.283 – ≤ 4.14.*
- unaffected 4.19.247 – ≤ 4.19.*
- unaffected 5.4.198 – ≤ 5.4.*
- unaffected 5.10.122 – ≤ 5.10.*
- unaffected 5.15.47 – ≤ 5.15.*
- unaffected 5.17.15 – ≤ 5.17.*
- unaffected 5.18.4 – ≤ 5.18.*
- unaffected 5.19 – ≤ *
References (8)
- https://git.kernel.org/stable/c/8a1435c862ea09b06be7acda325128dc08458e25 (opens in a new tab)
- https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c (opens in a new tab)
- https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e (opens in a new tab)
- https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca (opens in a new tab)
- https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db (opens in a new tab)
- https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f (opens in a new tab)
- https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79 (opens in a new tab)
- https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49295)Record last updated .