Security readout for executives and security teams
Plain-English summary
This Linux kernel flaw affects a narrow virtualization/device-passthrough path. A race in VFIO PCI interrupt handling can leave an interrupt permanently disabled for the user, disrupting the assigned device. Sources do not provide CVSS, confirmed exploitation, or broad remote attack evidence.
Executive priority
Treat as a targeted infrastructure maintenance issue, not an emergency internet-wide exposure from the provided evidence. Prioritize virtualization hosts and embedded products that use Linux VFIO PCI passthrough, then follow normal kernel patch governance.
Technical view
The bug is in vfio/pci exclusive INTx handling for devices without DisINTx support. request_irq() could briefly auto-enable the IRQ before VFIO reconciled masked state, allowing an interrupt to fire and double-increment disable depth. The fix uses IRQF_NO_AUTOEN so exclusive INTx is not auto-enabled before explicit unmasking.
Likely exposure
Likely exposure is Linux hosts running affected kernels with VFIO PCI device passthrough, especially devices using legacy INTx interrupts and requiring irqchip masking. General Linux servers without VFIO PCI passthrough are less likely to be practically exposed based on the provided description.
Exploitation context
CISA KEV status is false in the bundle, and no cited source states active exploitation. The source material describes a kernel race and stability/availability impact, not a public exploit path or remote unauthenticated attack.
Researcher notes
The affected-version data is sparse and partly commit-based. Validate against vendor backports rather than raw upstream version strings alone. The operational impact appears tied to an unrecoverable IRQ disable-depth mismatch for specific INTx passthrough devices.
Mitigation direction
- Update to a vendor kernel containing the referenced stable VFIO PCI fixes.
- Use distro advisories, including Debian LTS, to select the correct patched package.
- Check Siemens SSA-265688 where Siemens products or appliances are in scope.
- Review VFIO PCI passthrough use until affected hosts are patched.
- Avoid changing interrupt handling manually without vendor guidance.
Validation and detection
- Inventory Linux kernel versions across virtualization and passthrough hosts.
- Identify hosts loading VFIO PCI or assigning PCI devices to guests.
- Prioritize devices using legacy INTx or lacking DisINTx support.
- Confirm the relevant stable patch is present in the running vendor kernel.
- After update, regression-test affected passthrough devices and guest availability.
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.
CVE-2024-27437 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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
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/26389925d6c2126fb777821a0a983adca7ee6351CVE reference, Linux
- https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5CVE reference, Linux
- https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438CVE reference, Linux
- https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060CVE reference, Linux
- https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2CVE reference, Linux
- https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfdaCVE reference, Linux
- https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ecCVE reference, Linux
- https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlCVE reference, CVE · x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-265688.htmlCVE reference, siemens-SADP
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.