CVE-2021-45868 : In the Linux kernel before 5.15.3, fs/quota/quota

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

Products affected by CVE-2021-45868

Linux » Linux Kernel
Versions before (<) 5.15.3
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions
Netapp » H410c Firmware » Version: N/A
cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H410c » Version: N/A
Netapp » H300s Firmware » Version: N/A
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H300s » Version: N/A
Netapp » H500s Firmware » Version: N/A
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H500s » Version: N/A
Netapp » H700s Firmware » Version: N/A
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H700s » Version: N/A
Netapp » H300e Firmware » Version: N/A
cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H300e » Version: N/A
Netapp » H500e Firmware » Version: N/A
cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H500e » Version: N/A
Netapp » H700e Firmware » Version: N/A
cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H700e » Version: N/A
Netapp » H410s Firmware » Version: N/A
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Netapp » H410s » Version: N/A

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 957,713

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

EPSS FAQ

0.12%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 46 %

Percentile, the proportion of vulnerabilities that are scored at or less

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

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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