VulnerabilityPublished 28 Jul 2026Updated 17 Oct 2026

CVE-2026-62434: Xen · A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM

Affects xenSource GCVE Database

Not known to be exploited · CVSS 5.3 Medium.

Data as of 27 Oct 2026, 17:11 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Jul 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

ghsa-q4cr-q8pj-wgf3

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10xen`pkg:deb/ubuntu/xen?arch=source&distro=stonking`Other threats	Affected =4.20.2+7-g1badcf5035-2build2 =4.20.2+37-g61ff35323e-1ubuntu1 =4.20.3+127-gc42374a105-1	Fixed in–
Ubuntu 26.04 LTSxen`pkg:deb/ubuntu/xen?arch=source&distro=resolute`Other threats	Affected =4.20.0+68-g35cb38b222-1 =4.20.2+7-g1badcf5035-2 =4.20.2+7-g1badcf5035-2build2	Fixed in–
Ubuntu 24.04 LTSxen`pkg:deb/ubuntu/xen?arch=source&distro=noble`Other threats	Affected 4.17.2-1 – 4.17.3+10-g091466ba55-1.1ubuntu3 7 affected builds	Fixed in–
Ubuntu 22.04 LTSxen`pkg:deb/ubuntu/xen?arch=source&distro=jammy`Other threats	Affected =4.11.4+24-gddaaccbbab-1ubuntu2 =4.16.0-1~ubuntu2 =4.16.0-1~ubuntu2.1	Fixed in–
Ubuntu 20.04 LTSxen`pkg:deb/ubuntu/xen?arch=source&distro=focal`Other threats	Affected 4.9.2-0ubuntu2 – 4.11.3+24-g14b62ab3e5-1ubuntu2.3 7 affected builds	Fixed in–
Ubuntu 18.04 LTSxen`pkg:deb/ubuntu/xen?arch=source&distro=bionic`Other threats	Affected =4.9.0-0ubuntu3 =4.9.0-0ubuntu4 =4.9.2-0ubuntu1	Fixed in–

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

AI-suggested

No specific mitigations are indicated in the available data.

Description

CVE-2026-62434 is a vulnerability in Xen where a guest started with Populated on Demand (PoD) enabled can attempt to reclaim pages that are not regular guest RAM. This behavior can lead to corruption of the memory management state within Xen. The vulnerability has a medium severity rating and does not have known exploits in the wild. No affected versions or patches are explicitly stated in the available data.

Impact

The vulnerability can cause corruption of the memory management state in Xen, potentially leading to denial of service or instability of the hypervisor environment. There is no indication of confidentiality or integrity compromise. No known exploits are reported in the wild.

Summary

This vulnerability involves the Xen hypervisor's handling of memory pages when Populated on Demand (PoD) is enabled for a guest. A guest can attempt to reclaim pages outside of regular guest RAM, causing corruption in Xen's memory management state. The issue is categorized under CWE-787 (Out-of-bounds Write). The CVSS vector indicates a network attack vector with low complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but an availability impact classified as low. There is no information on affected versions or available 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).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jul 2026, 11:23 UTC

WeaknessesCWE-787

Technical details

References

Community reviews

Related threats