CVE-2024-56640
9.8 · CRITICALOverview
CVE-2024-56640 is a critical-severity vulnerability affecting linux linux_kernel. It was published on December 27, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix LGR and link use-after-free issue
We encountered a LGR/link use-after-free issue, which manifested as
the LGR/link refcnt reaching 0 early and entering the clear process,
making resource access unsafe.
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 14 PID: 107447 at lib/refcount.c:25 refcount_warn_saturate+0x9c/0x140
Workqueue: events smc_lgr_terminate_work [smc]
Call trace:
refcount_warn_saturate+0x9c/0x140
__smc_lgr_terminate.part.45+0x2a8/0x370 [smc]
smc_lgr_terminate_work+0x28/0x30 [smc]
process_one_work+0x1b8/0x420
worker_thread+0x158/0x510
kthread+0x114/0x118
or
refcount_t: underflow; use-after-free.
WARNING: CPU: 6 PID: 93140 at lib/refcount.c:28 refcount_warn_saturate+0xf0/0x140
Workqueue: smc_hs_wq smc_listen_work [smc]
Call trace:
refcount_warn_saturate+0xf0/0x140
smcr_link_put+0x1cc/0x1d8 [smc]
smc_conn_free+0x110/0x1b0 [smc]
smc_conn_abort+0x50/0x60 [s
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel 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 | >= 4.18, < 5.15.174 | Affected |
References
Frequently Asked Questions
What is CVE-2024-56640?
CVE-2024-56640 is a critical-severity vulnerability affecting linux linux_kernel. It was published on December 27, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2024-56640?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2024-56640?
Check the references section for vendor advisories and patches from linux. Update linux_kernel 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-2024-56640?
CyberStrike's AI-powered security agents can automatically detect CVE-2024-56640 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.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
Related CRITICAL CVEs from 2024
View all →An attacker in the wifi vicinity of a target Google Home can spy on the victim, resulting in Elevati
Google Nest WiFi Pro root code-execution & user-data compromise
In checkDebuggingDisallowed of DeviceVersionFragment.java, there is a possible way to access adb
Unrestricted Upload of File with Dangerous Type vulnerability in JS Help Desk JS Help Desk – Best He
In default installations of Microchip maxView Storage Manager (for Adaptec Smart Storage Controllers
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of
Deserialization of Untrusted Data vulnerability in Anton Bond Woocommerce Tranzila Payment Gateway.T
Deserialization of Untrusted Data vulnerability in Tagbox Tagbox – UGC Galleries, Social Media Widge
A vulnerability has been identified in SIMATIC IPC1047E (All versions with maxView Storage Manager <
An issue has been discovered in GitLab CE/EE affecting all versions from 16.1 prior to 16.1.6, 16.2
The Social Warfare plugin for WordPress is vulnerable to Remote Code Execution in versions up to, an
Unrestricted upload of dangerous file types in the C21 Live Encoder and Live Mosaic product, version