Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a race in DMA memory cleanup. Under concurrent activity, the kernel can free or remove the wrong internal tracking record for a DMA allocation, leading to a kernel warning and possible driver or system instability. Public sources do not provide a CVSS score or confirmed exploitation.
Executive priority
Treat this as a kernel maintenance and vendor-tracking item unless your environment depends heavily on custom drivers or embedded Linux devices. The public record lacks exploitation evidence and severity scoring, but kernel defects can be operationally disruptive when left unpatched.
Technical view
dmam_free_coherent() freed the DMA allocation before removing its devres tracking entry. A concurrent allocation could reuse the same virtual address and create duplicate devres entries, so devres_destroy() could match and free the wrong entry, triggering WARN_ON() in dmam_match. The fix changes the call order.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions or vendor products that embed those kernels. Internet reachability is not indicated by the sources; this appears tied to local kernel, driver, and device DMA behavior.
Exploitation context
The CVE source says KEV is false and provides no evidence of active exploitation. The public description identifies a concurrency flaw but does not describe an exploit path, attacker prerequisites, or practical impact beyond incorrect devres cleanup and WARN_ON().
Researcher notes
The core condition is a race between freeing DMA memory and destroying the devres tracking entry. Analysis should focus on affected kernel branches, downstream backports, and drivers using dmam_free_coherent(). Public evidence is insufficient to claim remote exploitability or broad privilege-escalation impact.
Mitigation direction
- Apply the relevant Linux stable kernel fix or vendor kernel update.
- Check Debian LTS and device vendor advisories for packaged fixes.
- Prioritize embedded, industrial, and appliance kernels that lag upstream stable releases.
- Avoid direct wrangler-style assumptions; follow vendor-specific kernel update guidance.
Validation and detection
- Inventory Linux kernel versions across servers, appliances, and embedded systems.
- Compare deployed kernels against vendor advisories and listed stable commits.
- Confirm whether downstream distributions backported the dmam_free_coherent() fix.
- Review kernel logs for related DMA/devres WARN_ON() events.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit fe2d246080f0
- Linux stable commit 2f7bbdc744f2
- Linux stable commit 257193083e8f
- Linux stable commit 87b34c8c94e2
- Linux stable commit f993a4baf6b6
- Linux stable commit 1fe97f68fce1
- Linux stable commit 22094f5f52e7
- Linux stable commit 28e8b7406d3a
- Debian LTS advisory January 2025
- Debian LTS advisory October 2024
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-2024-43856 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/fe2d246080f035e0af5793cb79067ba125e4fb63CVE reference, Linux
- https://git.kernel.org/stable/c/2f7bbdc744f2e7051d1cb47c8e082162df1923c9CVE reference, Linux
- https://git.kernel.org/stable/c/257193083e8f43907e99ea633820fc2b3bcd24c7CVE reference, Linux
- https://git.kernel.org/stable/c/87b34c8c94e29fa01d744e5147697f592998d954CVE reference, Linux
- https://git.kernel.org/stable/c/f993a4baf6b622232e4c190d34c220179e5d61ebCVE reference, Linux
- https://git.kernel.org/stable/c/1fe97f68fce1ba24bf823bfb0eb0956003473130CVE reference, Linux
- https://git.kernel.org/stable/c/22094f5f52e7bc16c5bf9613365049383650b02eCVE reference, Linux
- https://git.kernel.org/stable/c/28e8b7406d3a1f5329a03aa25a43aa28e087cb20CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlCVE reference, CVE
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.htmlCVE reference, CVE
- 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.