Security readout for executives and security teams
Plain-English summary
CVE-2024-43893 is a Linux kernel stability flaw in serial port handling. A local action using invalid serial settings can make the kernel divide by zero, causing an Oops and potential denial of service. The source bundle does not show remote exploitation, privilege escalation, CVSS scoring, or confirmed active exploitation.
Executive priority
Treat as a moderate Linux kernel availability issue. Patch through normal kernel maintenance, faster for multi-user, embedded, industrial, or appliance environments with serial interfaces. No source evidence supports emergency internet-wide response.
Technical view
The Linux serial core did not reject a zero uartclk early enough when TIOCSSERIAL supplied an invalid baud_base. Later termios processing reached uart_get_divisor() and divided by zero. Kernel stable commits add the missing check before applying other serial settings.
Likely exposure
Exposure is most relevant on Linux systems where users, services, containers, or device-management software can interact with serial TTY ioctls. Servers without accessible serial devices are likely lower risk. Siemens and Debian references show downstream tracking, so embedded and appliance fleets should verify vendor kernels.
Exploitation context
The bundle supports a local denial-of-service interpretation through ioctl-triggered kernel Oops. KEV is false, and no provided source states active exploitation or public weaponization. Required permissions and device access are not fully established in the supplied evidence.
Researcher notes
Key uncertainty is exploitability conditions around who can invoke TIOCSSERIAL on relevant ports. The root cause and fix location are clear from the kernel description and stable commits, but the bundle lacks CVSS, CWE, privilege requirements, or proof of exploitation.
Mitigation direction
- Apply Linux kernel updates containing the referenced stable serial-core fixes.
- Use distribution security updates, including Debian LTS advisories where applicable.
- Check Siemens ProductCERT guidance for affected Siemens products and fixed firmware.
- Restrict unnecessary local access to serial devices until patched.
- Prioritize systems where untrusted users or services can access TTY devices.
Validation and detection
- Inventory running kernel versions and vendor kernel package revisions.
- Check vendor advisories for CVE-2024-43893 coverage and fixed package versions.
- Confirm kernel changelogs include the serial core uartclk zero check.
- Review device permissions for serial TTY exposure to untrusted accounts.
- After patching, verify updated kernels are booted, not merely installed.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit 3bbd90f
- Linux stable commit 55b2a5d
- Linux stable commit 52b138f
- Linux stable commit 9196e42
- Linux stable commit e13ba3f
- Linux stable commit e3ad503
- Debian LTS advisory Jan 2025
- Debian LTS advisory Oct 2024
- Siemens ProductCERT SSA-265688
- Siemens ProductCERT SSA-613116
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-2024-43893 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/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaCVE reference, Linux
- https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24fCVE reference, Linux
- https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9eCVE reference, Linux
- https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49CVE reference, Linux
- https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051CVE reference, Linux
- https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2CVE reference, Linux
- https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8CVE reference, Linux
- https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193CVE 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
- https://cert-portal.siemens.com/productcert/html/ssa-613116.htmlCVE reference, siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-355557.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.