VulnerabilityPublished 8 Apr 2026Updated 4 Nov 2026

CVE-2025-37849: linux-realtime vulnerabilities

Affects Linux kernelSource GCVE Database

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Not known to be exploited : upgrade to 5.15.0-1103.112 soon.

Data as of 5 Nov 2026, 00:01 UTC

Severity

High

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.15.0-1103.112

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Apr 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 4 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-8159-3

What to do

Upgrade the Ubuntu linux-realtime package to 5.15.0-1103.112.

Patches and advisories

ubuntu.com/security/notices/USN-8159-3 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu Pro Realtime 22.04 LTSlinux-realtime`pkg:deb/ubuntu/linux-realtime?arch=source&distro=realtime/jammy`Other threats	Affected <5.15.0-1103.112	Fixed in 5.15.0-1103.112

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 users should update to linux-image-5.15.0-1103-realtime version 5.15.0-1103.112 or later. After updating, a system reboot is required to apply the changes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled. Standard system upgrades will handle this automatically unless kernel metapackages have been manually removed.

Description

Multiple security vulnerabilities were identified in the Linux kernel real-time variant affecting ARM64 architecture, Cryptographic API, Netfilter, and network traffic control subsystems. These flaws could potentially allow an attacker to compromise the system. The issues are addressed in the linux-image-5.15.0-1103-realtime package version 5.15.0-1103.112 and later. Users must update and reboot their systems, and recompile third-party kernel modules due to an ABI change.

References

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