CVE-2025-68811VulnerabilityPublished 6 Apr 2026Updated 21 Aug 2026

Red Hat Security Advisory: kernel security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

CVE-2026-23209

Not known to be exploited : upgrade to 11.0 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

Severity

Medium

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

EPSS: 0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 11.0

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Apr 2026
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.

ghsa-2gq5-6pmr-v24v

What to do

Upgrade Red Hat to 11.0.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=10.0 <11.0	Fixed in 11.0

AI-suggested

Red Hat has released an official kernel update for Red Hat Enterprise Linux 10.0 Extended Update Support that addresses these vulnerabilities. Users should apply the update as described in the Red Hat advisory (RHSA-2026:6692) and reboot their systems to ensure the fixes take effect. Patch status is confirmed as available and official.

Description

Red Hat has issued a security advisory for a kernel update addressing two vulnerabilities in the Linux kernel. The first vulnerability (CVE-2025-68811) involves the svcrdma component and fixes the use of rc_pageoff for memcpy byte offset. The second vulnerability (CVE-2026-23209) addresses error recovery in the macvlan component's macvlan_common_newlink() function. These issues affect Red Hat Enterprise Linux 10.0 Extended Update Support and related variants. The update is rated as having a moderate security impact. Systems must be rebooted after applying the update for the fixes to take effect.

Impact

The vulnerabilities affect the Linux kernel's svcrdma and macvlan components, potentially leading to improper memory operations and error recovery failures. Red Hat rates the security impact as moderate. No known exploits in the wild have been reported. The issues could affect system stability or security depending on the kernel modules' usage but no further impact details are provided.

Summary

This advisory covers two kernel vulnerabilities in Red Hat Enterprise Linux 10.0 EUS. CVE-2025-68811 fixes a flaw in the svcrdma kernel module related to the memcpy byte offset calculation using rc_pageoff. CVE-2026-23209 fixes error recovery in the macvlan_common_newlink() function within the macvlan kernel module. Both vulnerabilities have been addressed in the kernel update released by Red Hat. The advisory references Red Hat's errata RHSA-2026:6692 and provides links for applying the update. A system reboot is required to activate the patches.

CWE-787Out-of-bounds Write (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #5
The product writes data past the end, or before the beginning, of the intended buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
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-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).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 22 Aug 2026, 22:30 UTC

WeaknessesCWE-787, CWE-825

Technical details

References

Community reviews

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