Security readout for executives and security teams
Plain-English summary
A flaw in Linux netfilter’s x_tables handling allows a locally authenticated, low-privileged attacker to supply a name without proper termination. This may expose sensitive kernel-related information or disrupt the system. The issue is high severity but is not remotely exploitable according to the supplied CVSS vector.
Executive priority
Use an accelerated patch cycle, prioritizing shared or multi-user Linux systems. This is a meaningful local confidentiality and availability risk, but the supplied evidence does not justify emergency internet-wide incident treatment. Require asset owners to verify vendor backports rather than relying only on version numbers.
Technical view
x_tables passed fixed-size names to C-string functions without first ensuring a NUL terminator was present. The kernel fix rejects unterminated names. CVSS 3.1 scores this 7.1, with local access, low complexity, low privileges, no user interaction, and potentially high confidentiality and availability impact.
Likely exposure
Linux systems containing the affected x_tables code are candidates, particularly hosts accessible to untrusted local users or workloads. Network exposure alone is insufficient because the vector is local. The supplied version entries do not establish unambiguous affected and fixed ranges, so distribution-specific backports must be checked.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit. The CVSS vector indicates exploitation requires local low-privileged access but no user interaction. Reported impacts concern confidentiality and availability, not integrity.
Researcher notes
The source description identifies missing NUL-termination validation before C-string processing, but does not name the downstream functions, trigger path, CWE, or precise vulnerable branch boundaries. Stable commits are supplied across multiple kernel lines. Avoid inferring privilege escalation: the stated vector reports unchanged scope, no integrity impact, and high confidentiality and availability impact.
Mitigation direction
- Check Linux distributor advisories for affected packages and approved fixed kernel builds.
- Update to a supported kernel containing the applicable stable fix or vendor backport.
- Prioritize shared systems where untrusted users or workloads have local access.
- Apply normal access restrictions while patching; no specific workaround is documented in the bundle.
Validation and detection
- Inventory running kernel versions across Linux hosts and appliances.
- Compare package builds against distributor advisories, including documented backports.
- Verify the installed kernel contains the corresponding upstream fix or vendor equivalent.
- Reboot where required, confirm the running kernel, and regression-test netfilter operations.
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
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CVE-2026-43028 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
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/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.
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:N/A:H1.85.2LinuxVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:L/AC:L/PR:L/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/bcac50ea0a29d430eedc5ac87b215393b567baa9CVE reference, Linux
- https://git.kernel.org/stable/c/ea01c1b219f5a11c66918abaa6f052e5a74041d6CVE reference, Linux
- https://git.kernel.org/stable/c/aa6cd4a8863391e0a64f62d8922cb0af732a2cf2CVE reference, Linux
- https://git.kernel.org/stable/c/c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4CVE reference, Linux
- https://git.kernel.org/stable/c/673bbd36cba21d10a10f0932f479df7468e26fbbCVE reference, Linux
- https://git.kernel.org/stable/c/f419bdc205894750f4d3ec042bc87a1b9cde1351CVE reference, Linux
- https://git.kernel.org/stable/c/73124608172890306b85f2206d8b3cac20e324f1CVE reference, Linux
- https://git.kernel.org/stable/c/a958a4f90ddd7de0800b33ca9d7b886b7d40f74eCVE reference, Linux
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlCVE reference, siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-019113.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.