Linux Kernel up to 5.14.15 qib qib_user_sdma_pkt buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.14.15. The impacted element is an unknown function of the component qib. Executing a manipulation of the argument qib_user_sdma_pkt can lead to buffer overflow. This vulnerability appears as CVE-2021-47485. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.14.15. This vulnerability affects an unknown function of the component qib. The manipulation of the argument qib_user_sdma_pkt with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields Overflowing either addrlimit or bytes_togo can allow userspace to trigger a buffer overflow of kernel memory. Check for overflows in all the places doing math on user controlled buffers.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2021-47485 since 05/22/2024. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 297269 (Ubuntu 14.04 LTS / 16.04 LTS : Linux kernel vulnerabilities (USN-7987-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.4.292, 4.9.290, 4.14.255, 4.19.216, 5.4.157, 5.10.77 or 5.14.16 eliminates this vulnerability. Applying the patch bda41654b6e0/3f57c3f67fd9/60833707b968/73d2892148aa/0f8cdfff0682/c3e17e58f571/0d4395477741/d39bf40e55e6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (297269). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 297269
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS : Linux kernel vulnerabilities (USN-7987-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.4.292/4.9.290/4.14.255/4.19.216/5.4.157/5.10.77/5.14.16
Patch: bda41654b6e0/3f57c3f67fd9/60833707b968/73d2892148aa/0f8cdfff0682/c3e17e58f571/0d4395477741/d39bf40e55e6

Timelineinfo

05/22/2024 🔍
05/22/2024 +0 days 🔍
05/22/2024 +0 days 🔍
02/01/2026 +620 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-47485 (🔍)
GCVE (CVE): GCVE-0-2021-47485
GCVE (VulDB): GCVE-100-265888

Entryinfo

Created: 05/22/2024 11:37
Updated: 02/01/2026 12:28
Changes: 05/22/2024 11:37 (58), 01/07/2025 04:16 (13), 02/01/2026 12:28 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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