Security readout for executives and security teams
Plain-English summary
This CVE is a Linux kernel configuration bug in a debug unit test. On systems without an MMU, running the iov_iter KUnit test can crash the kernel. Business impact appears limited to specialized embedded or test environments, not typical production servers.
Executive priority
Treat this as low urgency unless the organization ships or tests NOMMU Linux builds. Prioritize embedded build pipelines and kernel CI reliability over broad emergency response.
Technical view
TEST_IOV_ITER can be enabled on NOMMU kernels even though the test calls vmap(), which is unsupported on NOMMU systems. Running the test can trigger a BUG in mm/nommu.c and kernel panic. The fix makes TEST_IOV_ITER depend on MMU.
Likely exposure
Exposure is most likely in Linux NOMMU builds where kernel debug or KUnit iov_iter testing is enabled. The record lists Linux 6.6, 6.6.19, 6.7.7, and 6.8 as affected, but downstream vendor status is not provided.
Exploitation context
No active exploitation is identified in the provided sources, and the CVE is not listed as KEV. The issue is described as a crash during a unit test on NOMMU systems, not a remote or privilege-escalation attack path.
Researcher notes
The public record is narrow: it documents a Kconfig dependency fix for a KUnit test crash. There is no CVSS, CWE, exploit evidence, or broader affected-product detail in the provided bundle.
Mitigation direction
- Apply a Linux kernel version containing the referenced stable fixes.
- Disable TEST_IOV_ITER on NOMMU builds until patched.
- Confirm kernel configuration enforces TEST_IOV_ITER only with MMU support.
- Check downstream Linux vendor advisories for package-specific fixes.
Validation and detection
- Identify NOMMU Linux builds in embedded, lab, or CI environments.
- Check whether TEST_IOV_ITER or kunit_iov_iter is enabled.
- Verify the relevant stable patch is present in kernel sources.
- Review test logs for iov_iter KUnit panics on NOMMU targets.
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-2024-27406 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/e6316749d603fe9c4c91f6ec3694e06e4de632a3CVE reference, Linux
- https://git.kernel.org/stable/c/9e6e541b97762d5b1143070067f7c68f39a408f8CVE reference, Linux
- https://git.kernel.org/stable/c/1eb1e984379e2da04361763f66eec90dd75cf63eCVE reference, Linux
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.