Security readout for executives and security teams
Plain-English summary
A malicious or compromised host can interfere with memory-encryption transitions in confidential Linux virtual machines using Hyper-V VMBus. Error handling may return still-decrypted, host-visible pages to the normal allocator, risking disclosure, corruption, or disruption inside the guest.
Executive priority
Treat as an urgent, configuration-specific kernel issue. Expedite assessment and patching for confidential workloads on potentially untrusted Hyper-V hosts; avoid declaring fleet-wide exposure until platform and kernel inventories confirm applicability.
Technical view
When set_memory_encrypted() or set_memory_decrypted() fails, VMBus may free pages that remain shared rather than private. The kernel fix deliberately leaks those pages instead of returning unsafe memory to the allocator. The issue crosses the host-guest trust boundary and is scored CVSS 9.3.
Likely exposure
Exposure appears limited to affected Linux kernels running confidential-computing virtual machines with Hyper-V VMBus. Conventional Linux systems outside this configuration are less likely to be exposed. The bundle’s version data does not provide a sufficiently clear fixed-version mapping for reliable inventory decisions.
Exploitation context
The untrusted host can trigger the relevant transition failures without guest privileges or user interaction. However, the bundle reports no CISA KEV listing and provides no evidence of active exploitation or a public exploit.
Researcher notes
CWE-1258 describes exposure of sensitive information through uncleared resource reuse. Here, failed encryption-state transitions can leave shared pages eligible for reuse. The remediation trades a bounded page leak on failure for preventing unsafe allocator reuse. Source evidence does not establish exploit reliability, observed attacks, or exact distribution package boundaries.
Mitigation direction
- Prioritize affected confidential-computing guests running Hyper-V VMBus.
- Update to a vendor-supported kernel containing the referenced upstream fix.
- Consult Linux distribution guidance for exact fixed package versions.
- Restrict confidential workloads from hosts that are not fully trusted until remediation.
Validation and detection
- Inventory Linux confidential-computing guests using Hyper-V VMBus.
- Record each guest’s kernel and distribution package version.
- Confirm vendor advisories identify that version as fixed or unaffected.
- Verify the installed kernel incorporates the applicable referenced stable commit.
- Monitor vendor guidance because the supplied version mapping is ambiguous.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1258: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2024-36913 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H2.56LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/7f2afcbfe4f6b6047b5f68db5067b7321e5be125CVE reference, Linux
- https://git.kernel.org/stable/c/6123a4e8e25bd40cf44db14694abac00e6b664e6CVE reference, Linux
- https://git.kernel.org/stable/c/e813a0fc2e597146e9cebea61ced9c796d4e308fCVE reference, Linux
- https://git.kernel.org/stable/c/03f5a999adba062456c8c818a683beb1b498983aCVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlCVE reference, CVE
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive System Information Due to Uncleared Debug Information
Exposure of Sensitive System Information Due to Uncleared Debug Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.