CVE-2021-47247
7.8 · HIGHOverview
CVE-2021-47247 is a high-severity vulnerability affecting debian debian_linux. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: Fix use-after-free of encap entry in neigh update handler
Function mlx5e_rep_neigh_update() wasn't updated to accommodate rtnl lock
removal from TC filter update path and properly handle concurrent encap
entry insertion/deletion which can lead to following use-after-free:
[23827.464923] ==================================================================
[23827.469446] BUG: KASAN: use-after-free in mlx5e_encap_take+0x72/0x140 [mlx5_core]
[23827.470971] Read of size 4 at addr ffff8881d132228c by task kworker/u20:6/21635
[23827.472251]
[23827.472615] CPU: 9 PID: 21635 Comm: kworker/u20:6 Not tainted 5.13.0-rc3+ #5
[23827.473788] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[23827.475639] Workqueue: mlx5e mlx5e_rep_neigh_update [mlx5_core]
[23827.476731] Call Trace:
[23827.477260] dump_stack+0xbb/0x107
[23827.477906] print_address_
Remediation
Check the references section for vendor advisories and patches from debian. Update debian_linux to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 0, < 5.10.237 | Affected |
References
Frequently Asked Questions
What is CVE-2021-47247?
CVE-2021-47247 is a high-severity vulnerability affecting debian debian_linux. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-47247?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-47247?
Check the references section for vendor advisories and patches from debian. Update debian_linux to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-47247?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-47247 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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