CVE-2021-47197 Vulnerability Analysis & Exploit Details

CVE-2021-47197
Vulnerability Scoring

5.5

/10

Significant Risk

Security assessments indicate that CVE-2021-47197 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Local
Vulnerability requires local system access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2021-47197 Details

Status: Analyzed

Last updated: 🕛 21 Mar 2025, 12:03 UTC
Originally published on: 🕖 10 Apr 2024, 19:15 UTC

Time between publication and last update: 344 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE-2021-47197 Vulnerability Summary

CVE-2021-47197: In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: nullify cq->dbg pointer in mlx5_debug_cq_remove() Prior to this patch in case mlx5_core_destroy_cq() failed it proceeds to rest of destroy operations. mlx5_core_destroy_cq() could be called again by user and cause additional call of mlx5_debug_cq_remove(). cq->dbg was not nullify in previous call and cause the crash. Fix it by nullify cq->dbg pointer after removal. Also proceed to destroy operations only if FW return 0 for MLX5_CMD_OP_DESTROY_CQ command. general protection fault, probably for non-canonical address 0x2000300004058: 0000 [#1] SMP PTI CPU: 5 PID: 1228 Comm: python Not tainted 5.15.0-rc5_for_upstream_min_debug_2021_10_14_11_06 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:lockref_get+0x1/0x60 Code: 5d e9 53 ff ff ff 48 8d 7f 70 e8 0a 2e 48 00 c7 85 d0 00 00 00 02 00 00 00 c6 45 70 00 fb 5d c3 c3 cc cc cc cc cc cc cc cc 53 <48> 8b 17 48 89 fb 85 d2 75 3d 48 89 d0 bf 64 00 00 00 48 89 c1 48 RSP: 0018:ffff888137dd7a38 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888107d5f458 RCX: 00000000fffffffe RDX: 000000000002c2b0 RSI: ffffffff8155e2e0 RDI: 0002000300004058 RBP: ffff888137dd7a88 R08: 0002000300004058 R09: ffff8881144a9f88 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881141d4000 R13: ffff888137dd7c68 R14: ffff888137dd7d58 R15: ffff888137dd7cc0 FS: 00007f4644f2a4c0(0000) GS:ffff8887a2d40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b4500f4380 CR3: 0000000114f7a003 CR4: 0000000000170ea0 Call Trace: simple_recursive_removal+0x33/0x2e0 ? debugfs_remove+0x60/0x60 debugfs_remove+0x40/0x60 mlx5_debug_cq_remove+0x32/0x70 [mlx5_core] mlx5_core_destroy_cq+0x41/0x1d0 [mlx5_core] devx_obj_cleanup+0x151/0x330 [mlx5_ib] ? __pollwait+0xd0/0xd0 ? xas_load+0x5/0x70 ? xa_load+0x62/0xa0 destroy_hw_idr_uobject+0x20/0x80 [ib_uverbs] uverbs_destroy_uobject+0x3b/0x360 [ib_uverbs] uobj_destroy+0x54/0xa0 [ib_uverbs] ib_uverbs_cmd_verbs+0xaf2/0x1160 [ib_uverbs] ? uverbs_finalize_object+0xd0/0xd0 [ib_uverbs] ib_uverbs_ioctl+0xc4/0x1b0 [ib_uverbs] __x64_sys_ioctl+0x3e4/0x8e0

Assessing the Risk of CVE-2021-47197

Access Complexity Graph

The exploitability of CVE-2021-47197 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-47197

CVE-2021-47197 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-47197, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-47197, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2021-47197 has no significant impact on data confidentiality.
Integrity: None
CVE-2021-47197 poses no threat to data integrity.
Availability: High
CVE-2021-47197 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.045% (probability of exploit)

EPSS Percentile: 18.4% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 81.6% of others.

CVE-2021-47197 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

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cpe:2.3:o:linux:linux_kernel:5.14.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.18:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.18:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.19:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.19:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.20:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.20:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.21:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14.21:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.0-58:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.0-58:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-47197: Combat Critical CVE Threats

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