CVE-2025-37823VulnerabilityPublished 2 Sep 2025Updated 11 Oct 2026

SUSE · security update for kernel

Affects SUSESource GCVE Database

Not known to be exploited · fixed in 5.15.0-1094.103~20.04.1 : patch SUSE soon.

Data as of 25 Oct 2026, 19:02 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.15.0-1094.103~20.04.1, 5.15.0-1088.95~20.04.1, 5.15.0-1087.96~20.04.2 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Sep 2025
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: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
SUSE Product Security Team SUSE	Affected <5.15.0-1088.95~20.04.1 <5.15.0-1094.103~20.04.1 <5.15.0-1087.96~20.04.2 <5.15.0-144.157~20.04.1 <5.15.0-1080.83~20.04.1	Fixed in 5.15.0-1088.95~20.04.1 5.15.0-1094.103~20.04.1 5.15.0-1087.96~20.04.2 5.15.0-144.157~20.04.1 5.15.0-1080.83~20.04.1

AI-suggested

A security update patch is available from Red Hat and SUSE. Systems running affected kernel versions should apply the update as soon as possible and reboot to ensure the fix takes effect. Refer to the vendor advisory (https://access.redhat.com/errata/RHSA-2025:15011) and update instructions (https://access.redhat.com/articles/11258) for detailed guidance. No additional mitigation steps are required beyond applying the official patch.

Description

A use-after-free (UAF) vulnerability in the Linux kernel's net_sched hfsc_dequeue() function has been fixed. This vulnerability could potentially lead to memory corruption issues. The flaw was addressed by the SUSE Product Security Team and Red Hat in their kernel security updates. The vulnerability affects certain versions of the Linux kernel used in Red Hat Enterprise Linux 9 and related distributions. A patch is available, and applying the update requires a system reboot. No known exploits are currently reported in the wild.

Impact

Successful exploitation of this vulnerability could result in use-after-free conditions in the kernel, potentially leading to system instability or privilege escalation. However, no known exploits are reported in the wild at this time. The vulnerability affects the core Linux kernel, which is critical for system operation.

Summary

CVE-2025-37823 is a use-after-free vulnerability in the Linux kernel's net_sched subsystem, specifically in the hfsc_dequeue() function. The issue was identified as a potential UAF condition that could lead to memory corruption. The vulnerability was fixed by safeguarding the hfsc_dequeue() function. The fix is included in updated kernel packages provided by Red Hat and SUSE. The Red Hat advisory RHSA-2025:15011 confirms the availability of the patch and recommends updating affected systems. The vulnerability is rated as high severity by the vendor.

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).
CWE-191Integer Underflow (Wrap or Wraparound) (opens in a new tab)
Base weakness
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
CWE-664Improper Control of a Resource Through its Lifetime (opens in a new tab)
Pillar weakness
The product does not maintain or incorrectly maintains control over a resource throughout its lifetime of creation, use, and release.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Attack patterns
Session Credential Falsification through Forging (opens in a new tab)
Reusing Session IDs (aka Session Replay) (opens in a new tab)
Session Fixation (opens in a new tab)
Cross Site Request Forgery (opens in a new tab)
Exploitation of Trusted Identifiers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-825Expired Pointer Dereference (opens in a new tab)
Base weakness
The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
Architecture and Design
Choose a language that provides automatic memory management.
Implementation
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).
CWE-476NULL Pointer Dereference (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #13OWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product dereferences a pointer that it expects to be valid but is NULL.
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished.
Requirements
Select a programming language that is not susceptible to these issues.
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
OWASP Cheat Sheets
Logging (opens in a new tab)
Error Handling (opens in a new tab)
OWASP ASVS 4.0.3
V11.1.7 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Oct 2026, 22:24 UTC

WeaknessesCWE-416, CWE-191, CWE-664 +2

Technical details

References

Community reviews

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