CVE-2024-36971VulnerabilityPublished 19 Aug 2024Updated 1 Sep 2026

Red Hat Security Advisory: kpatch-patch-4_18_0-372_87_1 and kpatch-patch-4_18_0-372_91_1 security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

Exploited in the wild · KEV due 28 Aug 2024 · 2% EPSS : upgrade to 8.6.372.91 now.

Data as of 25 Oct 2026, 19:02 UTC

Exploitation

Actively exploited

High severity · No CVSS score from NVD or the CNA

KEV deadline: 28 Aug 2024 US federal agencies must patch by this date; a sensible deadline for everyone else.
EPSS: 2.7% chance of exploitation in 30 days – higher than 85% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.6.372.91

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 19 Aug 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 12 days before disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

Added to CISA KEV (opens in a new tab)
exploitation confirmed
2024-08-07, 12 days before disclosure
CVE published
on cve.org
2024-08-1918:26Z, t = 0
KEV remediation due
US federal deadline
2024-08-28, 9 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat to 8.6.372.91.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=8.6 <8.6.372.91	Fixed in 8.6.372.91

Description

Red Hat has released a security advisory for kernel live patch modules kpatch-patch-4_18_0-372_87_1 and kpatch-patch-4_18_0-372_91_1 targeting kernel version 4.18.0-372.87.1.el8_6. The update addresses three vulnerabilities: a use-after-free (UAF) in network route management (CVE-2024-36971) and two denial of service issues related to virtio-net tap and tun interfaces with mlx5_core short frames (CVE-2024-41090 and CVE-2024-41091). These vulnerabilities affect Red Hat Enterprise Linux 8.6 versions prior to 8.6.372.91. The advisory rates the impact as Important (high severity) and provides updated patch packages to remediate these issues.

Impact

The vulnerabilities include a use-after-free in network route management, which could lead to kernel memory corruption or crashes, and denial of service conditions in virtio-net tap and tun drivers that may disrupt network functionality. These issues can affect system stability and availability on affected Red Hat Enterprise Linux 8.6 systems. No known exploits in the wild have been reported at this time.

Mitigation

Red Hat has released official patches in the form of kpatch live patch modules for Red Hat Enterprise Linux 8.6. Users should apply the updated kpatch-patch-4_18_0-372_91_1 or later packages to remediate these vulnerabilities. Detailed instructions for applying the update are available in the Red Hat advisory at https://access.redhat.com/articles/11258. Systems running affected versions prior to 8.6.372.91 should be updated promptly. No additional mitigation steps are indicated by the vendor.

CWE-20Improper Input Validation (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #18OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Attack Surface Reduction
Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build "recognizers" for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of…
Architecture and Design · Libraries or Frameworks
Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Server Side Include (SSI) Injection (opens in a new tab)
Cross Zone Scripting (opens in a new tab)
Command Line Execution through SQL Injection (opens in a new tab)
Object Relational Mapping Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-416Use After Free (opens in a new tab)
Variant weaknessLikelihood of exploit: HighCWE Top 25 (2025): #7
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.
Architecture and Design · Language Selection
Choose a language that provides automatic memory management.
Implementation · Attack Surface Reduction
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 21:32 UTC

WeaknessesCWE-20, CWE-416

Technical details

References

Community reviews

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