libxl leaks data to PVH guests via ACPI tables
PVH guests have their ACPI tables constructed by the toolstack. The construction involves building the tables in local memory, which are then copied into guest memory. While actually used parts of the local memory are filled in correctly, excess space that is being allocated is left with its prior contents.
- Published
- Dec 19, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 20th percentile
- CWE
- CWE-276
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| xen | xen | cpe:2.3:o:xen:xen |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- xen xen4.8.0 and later
Versions reported by the vendor
Affected version ranges reported by the assigning authority (XEN). Independent of NVD's CPE analysis and usually ahead of it.
Xen Xen
- consult Xen advisory XSA-464unknown
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.17 | xen | from 4.8.0 · before 4.16.6-r3 | 4.16.6-r3 |
| Alpine:v3.18 | xen | from 4.8.0 · before 4.17.5-r2 | 4.17.5-r2 |
| Alpine:v3.19 | xen | from 4.8.0 · before 4.18.3-r2 | 4.18.3-r2 |
| Alpine:v3.21 | xen | from 4.8.0 · before 4.19.0-r1 | 4.19.0-r1 |
| Debian:12 | xen | before 4.17.5+23-ga4e5191dc0-1 | 4.17.5+23-ga4e5191dc0-1 |
| Debian:13 | xen | before 4.19.1-1 | 4.19.1-1 |
| openSUSE:Tumbleweed | xen | before 4.19.0_06-1.1 | 4.19.0_06-1.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | xen | before 4.13.5_16-150200.3.99.1 | 4.13.5_16-150200.3.99.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | xen | before 4.14.6_22-150300.3.84.1 | 4.14.6_22-150300.3.84.1 |
| SUSE:Linux Enterprise Micro 5.3 | xen | before 4.16.6_06-150400.4.65.1 | 4.16.6_06-150400.4.65.1 |
| SUSE:Linux Enterprise Micro 5.5 | xen | before 4.17.5_06-150500.3.42.1 | 4.17.5_06-150500.3.42.1 |
| SUSE:Linux Enterprise Micro 5.5 | xen | before 4.17.5_06-150500.3.42.1 | 4.17.5_06-150500.3.42.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | xen | before 4.18.3_06-150600.3.12.1 | 4.18.3_06-150600.3.12.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | xen | before 4.18.3_06-150600.3.12.1 | 4.18.3_06-150600.3.12.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | xen | before 4.12.4_58-3.124.1 | 4.12.4_58-3.124.1 |
Same product
xen: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-10921The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, whi41Plan
- CVE-2017-10920The grant-table feature in Xen through 4.8.x mishandles a GNTMAP_device_map and GNTMAP_host_map mapping, when followed by only a GNTMAP_host41Plan
- CVE-2017-10918Xen through 4.8.x does not validate memory allocations during certain P2M operations, which allows guest OS users to obtain privileged host 41Plan
- CVE-2017-10912Xen through 4.8.x mishandles page transfer, which allows guest OS users to obtain privileged host OS access, aka XSA-217.41Plan
- CVE-2015-8104The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host O41Plan
- CVE-2015-5165The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to41Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:xen | 4.16.6-r3 · Alpine:v3.17 | Package registry (OSV) |
| debian:xen | 4.17.5+23-ga4e5191dc0-1 · Debian:12 | Package registry (OSV) |
| opensuse:xen | 4.17.5_06-150500.3.42.1 · openSUSE:Leap Micro 5.5 | Package registry (OSV) |
| suse:xen | 4.14.6_22-150300.3.84.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:xen | 4.17.5_06-150500.3.42.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Jason AndryukAMD.finder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-276 · Incorrect Default PermissionsCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- xenbits.xenproject.org/xsa/advisory-464.html
- www.openwall.com/lists/oss-security/2024/11/12/1
- www.openwall.com/lists/oss-security/2024/11/12/10
- www.openwall.com/lists/oss-security/2024/11/12/7
- xenbits.xen.org/xsa/advisory-464.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.