CVE-2021-45868 : In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk).

In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.

Published 2022-03-18 07:15:07

Updated 2023-02-04 00:00:28

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Threat overview for CVE-2021-45868

Top countries where our scanners detected CVE-2021-45868

Top open port discovered on systems with this issue 49152

IPs affected by CVE-2021-45868 955,369

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-45868!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-45868

Probability of exploitation activity in the next 30 days: 0.09%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 37 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-45868

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:N/A:P	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
5.5	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	1.8	3.6	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-45868

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-2021-45868

https://bugzilla.kernel.org/show_bug.cgi?id=214655

214655 – BUG: unable to handle kernel paging request in __dquot_free_space
Exploit;Issue Tracking;Vendor Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/2

oss-security - Re: Linux Kernel 5.15-rc-ksmbd-part2 is affected by: Buffer Overflow. The impact is: use-after-free (local).
Exploit;Mailing List;Patch;Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3

Mailing List;Release Notes;Vendor Advisory
https://security.netapp.com/advisory/ntap-20220419-0003/

February 2022 Linux Kernel 5.15.2 Vulnerabilities in NetApp Products | NetApp Product Security
Third Party Advisory

CVEs referencing this url
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050

kernel/git/torvalds/linux.git - Linux kernel source tree
Mailing List;Patch;Vendor Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/1

oss-security - Linux Kernel 5.15-rc-ksmbd-part2 is affected by: Buffer Overflow. The impact is: use-after-free (local).
Exploit;Mailing List;Patch;Third Party Advisory

Products affected by CVE-2021-45868