Security readout for executives and security teams
Plain-English summary
This is a Linux kernel EFI runtime bookkeeping bug, not a remote internet-facing issue. The CVSS source requires local access with high privileges. If exploitable on a system, impact could include sensitive data exposure or host disruption, so affected kernels should be updated through trusted vendor channels.
Executive priority
Treat as a routine but real kernel patching item. It is not presented as remotely exploited, but the possible confidentiality and availability impact justifies inclusion in the next Linux maintenance cycle, faster for high-value shared systems.
Technical view
The kernel fix addresses a potential overflow when calculating EFI soft-reserved memory region size. The source says md_size can be narrowed when a soft-reserved region contains at least 4GB worth of pages. CVSS 3.1 rates it 6.0 with local access, low complexity, high privileges, no user interaction, high confidentiality impact, and high availability impact.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions or downstream packages that include the vulnerable EFI runtime code. The bundle identifies Linux kernels including 5.5, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, and 6.8 as affected data points, with stable kernel fixes referenced.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The CVSS vector indicates exploitation requires local access and high privileges, which lowers broad external attack likelihood but matters on shared, delegated-admin, or already-compromised Linux hosts.
Researcher notes
Evidence is sparse and centered on kernel stable commits plus a Debian LTS notice. The core condition is integer narrowing around EFI soft-reserved memory sizing. Avoid assuming reachable exploitation on every Linux host; validate kernel lineage, distribution backports, EFI usage, and vendor patch status.
Mitigation direction
- Update affected Linux kernels using vendor-supported packages or stable kernel fixes.
- Review Debian LTS guidance if managing Debian LTS systems.
- Prioritize shared hosts, privileged multi-user systems, and critical Linux infrastructure.
- Check vendor advisories before applying non-distribution kernels.
- Track reboot requirements after kernel package updates.
Validation and detection
- Inventory Linux kernel versions across servers, workstations, and appliances.
- Compare installed kernels against vendor advisories for CVE-2024-26843.
- Confirm patched kernels include one of the referenced stable fixes.
- Verify affected systems rebooted into the updated kernel.
- Document exceptions where vendor guidance says the system is unaffected.
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-2024-26843 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
- Medium
- CVSS
- 6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/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
1 official scoreWe 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:H/UI:N/S:U/C:H/I:N/A:H0.85.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
6MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/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/4fff3d735baea104017f2e3c245e27cdc79f2426CVE reference, Linux
- https://git.kernel.org/stable/c/4aa36b62c3eaa869860bf78b1146e9f2b5f782a9CVE reference, Linux
- https://git.kernel.org/stable/c/700c3f642c32721f246e09d3a9511acf40ae42beCVE reference, Linux
- https://git.kernel.org/stable/c/cf3d6813601fe496de7f023435e31bfffa74ae70CVE reference, Linux
- https://git.kernel.org/stable/c/156cb12ffdcf33883304f0db645e1eadae712fe0CVE reference, Linux
- https://git.kernel.org/stable/c/de1034b38a346ef6be25fe8792f5d1e0684d5ff4CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlCVE reference, CVE · x_transferred
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.