Security readout for executives and security teams
Plain-English summary
CVE-2024-26891 is a Linux kernel availability flaw. On systems using Intel VT-d IOMMU with PCIe hotplug devices, a disconnected device can still receive an invalidation request, causing a retry loop, hard lockup, and possible kernel panic.
Executive priority
Treat this as a targeted availability risk rather than broad internet-facing exposure. Prioritize critical Linux hosts where PCIe hotplug failures could interrupt production, especially appliances, servers, or industrial systems relying on vendor-managed kernels.
Technical view
The issue is in the Linux iommu/vt-d path. During PCIe hotplug removal or hot reset, the kernel may issue ATS device-TLB invalidation to a device that no longer exists. The reported failure occurs in interrupt context and can hang the system.
Likely exposure
Exposure appears limited to Linux systems with Intel VT-d IOMMU and hotplug-capable PCIe endpoints. The bundle lists affected Linux kernel versions and upstream stable fixes, but organizations should confirm through their distribution or appliance vendor.
Exploitation context
The source bundle does not show active exploitation, KEV listing, public exploit evidence, or remote attack evidence. The described trigger involves device link changes or hotplug removal behavior, making availability impact the main concern.
Researcher notes
The evidence supports a kernel DoS/hard-lockup condition in Intel VT-d ATS invalidation during PCIe hotplug disconnect. CVSS and CWE are absent in the bundle. Do not infer remote exploitability; validate against kernel configuration, hardware topology, and vendor backports.
Mitigation direction
- Apply Linux kernel updates containing the referenced upstream stable fixes.
- Use distribution or appliance vendor advisories to identify the corrected kernel package.
- Prioritize systems with Intel VT-d, ATS-capable PCIe devices, and hotplug-capable slots.
- For Siemens products, follow the Siemens ProductCERT advisory guidance.
- Where patching is delayed, reduce exposure to untrusted PCIe hotplug operations.
Validation and detection
- Inventory Linux kernel versions on systems using Intel VT-d IOMMU.
- Identify hosts with PCIe hotplug-capable endpoints or field-replaceable PCIe devices.
- Confirm vendor kernel packages include the CVE-2024-26891 stable fix.
- Review crash logs for pciehp, qi_submit_sync, ATS invalidation, or hard LOCKUP traces.
- Check Debian LTS or appliance advisories for package-specific status.
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-2024-26891 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/f873b85ec762c5a6abe94a7ddb31df5d3ba07d85CVE reference, Linux
- https://git.kernel.org/stable/c/d70f1c85113cd8c2aa8373f491ca5d1b22ec0554CVE reference, Linux
- https://git.kernel.org/stable/c/34a7b30f56d30114bf4d436e4dc793afe326fbcfCVE reference, Linux
- https://git.kernel.org/stable/c/2b74b2a92e524d7c8dec8e02e95ecf18b667c062CVE reference, Linux
- https://git.kernel.org/stable/c/c04f2780919f20e2cc4846764221f5e802555868CVE reference, Linux
- https://git.kernel.org/stable/c/025bc6b41e020aeb1e71f84ae3ffce945026de05CVE reference, Linux
- https://git.kernel.org/stable/c/4fc82cd907ac075648789cc3a00877778aa1838bCVE 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.