Vulnerability Details : CVE-2021-3348

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.

Vulnerability category: Memory Corruption

Published 2021-02-01 04:15:14

Updated 2022-04-26 16:17:03

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-3348

Probability of exploitation activity in the next 30 days: 0.04%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 6 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-3348

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.4	MEDIUM	AV:L/AC:M/Au:N/C:P/I:P/A:P	3.4	6.4	nvd@nist.gov
Access Vector: Local Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
7.0	HIGH	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	1.0	5.9	nvd@nist.gov
Attack Vector: Local Attack Complexity: High Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-3348

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Assigned by: nvd@nist.gov (Primary)
CWE-416 Use After Free

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-3348

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b98e762e3d71e893b221f871825dc64694cfb258

Mailing List;Patch;Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/02/01/1

oss-security - Re: Re: Linux kernel: linux-block: nbd: use-after-free Read in nbd_queue_rq
Mailing List;Patch;Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html

[SECURITY] [DLA 2610-1] linux-4.19 security update
Third Party Advisory

CVEs referencing this url
https://www.openwall.com/lists/oss-security/2021/01/28/3

oss-security - Linux kernel: linux-block: nbd: use-after-free Read in nbd_queue_rq
Mailing List;Patch;Third Party Advisory

Products affected by CVE-2021-3348

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel
Versions up to, including, (<=) 5.10.12
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions