Security readout for executives and security teams
Plain-English summary
A race in Linux DMA memory cleanup can confuse kernel bookkeeping when another task quickly reuses the freed address. The kernel may remove the wrong tracking record and raise a warning. The record rates this high severity, but the supplied evidence does not establish reliable privilege escalation or real-world compromise.
Executive priority
Treat this as a high-priority kernel maintenance issue, accelerating remediation on systems permitting low-privileged local access or using DMA-intensive drivers. The sources do not show an unauthenticated internet attack path or active exploitation, so prioritize using actual kernel and vendor-package exposure.
Technical view
dmam_free_coherent() freed a DMA allocation before removing its devres entry. A concurrent allocation could reuse the same virtual address, creating duplicate matches; devres_destroy() could then free the wrong entry and trigger WARN_ON() in dmam_match. The stable fixes reverse the cleanup order.
Likely exposure
Exposure applies to affected Linux kernels when reachable driver activity invokes managed coherent DMA cleanup under the required concurrency. The supplied version data includes ambiguous entries and does not identify affected drivers, so confirm exposure using distribution or device-vendor backport records.
Exploitation context
The CVSS vector describes a local, low-complexity attack requiring low privileges and no user interaction. The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit. Trigger reliability and practical security impact remain unclear.
Researcher notes
The documented outcome is race-dependent devres bookkeeping corruption and a dmam_match warning. The supplied sources do not establish deterministic code execution, privilege escalation, affected driver families, or exploit availability. Distribution exposure depends on backports, making commit-level package verification more reliable than version comparison alone.
Mitigation direction
- Update to a vendor-supported kernel containing the applicable stable fix or downstream backport.
- Reboot into the updated kernel and remove vulnerable kernels from normal boot selection.
- If patching is delayed, consult vendor guidance; the supplied sources identify no safe workaround.
Validation and detection
- Inventory running kernel versions and distribution package revisions across potentially affected systems.
- Confirm each installed package contains the applicable stable commit or documented downstream backport.
- Reboot patched systems and verify the running kernel matches the remediated package.
- Review kernel logs for WARN_ON reports involving dmam_match; absence alone does not prove safety.
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-2024-43856 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/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.