VulnerabilityPublished 23 Mar 2026Updated 3 Nov 2026

CVE-2025-40246: linux-realtime-6.17 vulnerabilities

Affects Linux kernelSource GCVE Database

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Not known to be exploited : upgrade to 6.17.0-1008.9~24.04.1 soon.

Data as of 3 Nov 2026, 17:32 UTC

Severity

High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Patch: Available – fixed in 6.17.0-1008.9~24.04.1

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 3 Nov 2026.

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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity 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.

usn-8094-3

What to do

Upgrade the Ubuntu linux-realtime-6.17 package to 6.17.0-1008.9~24.04.1.

Patches and advisories

ubuntu.com/security/notices/USN-8094-3 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu Pro Realtime 24.04 LTSlinux-realtime-6.17`pkg:deb/ubuntu/linux-realtime-6.17?arch=source&distro=realtime/noble`Other threats	Affected <6.17.0-1008.9~24.04.1	Fixed in 6.17.0-1008.9~24.04.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied by updating to linux-realtime-6.17.0-1008.9~24.04.1 as provided by the Ubuntu security notice USN-8094-3. After updating, a system reboot is required to apply all changes. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure full remediation.

Description

Multiple security vulnerabilities were discovered in the linux-realtime-6.17 kernel, including issues in the AppArmor Linux kernel Security Module (LSM) that could allow an unprivileged local attacker to manipulate AppArmor profiles, leading to denial of service, exposure of kernel memory, local privilege escalation, or container escape. Additionally, some AMD Zen 5 processors with RDSEED instruction support improperly handle entropy, potentially allowing attackers to influence random values, causing confidentiality and integrity loss. Numerous other kernel subsystems and drivers were also affected by various security flaws.

Impact

An unprivileged local attacker could exploit AppArmor LSM vulnerabilities to manipulate security profiles, causing denial of service, exposure of kernel memory, privilege escalation, or container escape. The entropy issue in AMD Zen 5 processors could allow attackers to influence random number generation, leading to loss of confidentiality and integrity. Other kernel flaws could be leveraged to compromise system security. Overall, these vulnerabilities pose risks of local privilege escalation, information disclosure, denial of service, and container breakout.

References

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