Security readout for executives and security teams
Plain-English summary
A Linux kernel BPF verifier flaw can incorrectly skip analysis of a packet-access state. This may weaken a security boundary intended to reject unsafe BPF programs. The supplied severity is high because successful local exploitation could affect confidentiality, integrity, and availability, but no concrete attack chain is documented.
Executive priority
Prioritize patch assessment for multi-user systems, shared compute, appliances, and hosts permitting low-privileged BPF access. Treat this as a high-severity local privilege boundary issue, while avoiding emergency-exploitation claims because active attacks are not supported by the supplied evidence.
Technical view
The BPF verifier’s regsafe() comparison may wrongly treat two packet-pointer register states as equivalent when the older range is BEYOND_PKT_END. That can prune the current state before its valid packet range is explored. The record provides stable-kernel fix commits but does not explain the resulting memory-safety primitive or exploitation chain.
Likely exposure
Exposure concerns Linux systems running an affected kernel and reachable by a low-privileged local user, as reflected by the CVSS vector. The supplied version data spans several stable branches but does not clearly express complete affected ranges. Administrators should map distribution package versions against vendor advisories and the referenced fixes.
Exploitation context
The CVSS vector indicates local access, low privileges, low complexity, and no user interaction. The supplied record is not in CISA KEV, and the sources provide no evidence of active exploitation or a public proof of concept. Practical exploitability remains insufficiently documented.
Researcher notes
The key defect is unsafe verifier state equivalence and path pruning for packet pointers. Source detail is too limited to establish whether exploitation enables verifier bypass, out-of-bounds access, or another primitive. Version interpretation also requires branch-specific vendor confirmation. Analysis should focus on patch-diff review and defensive regression testing without assuming exploitability.
Mitigation direction
- Install a supported Linux or downstream kernel update containing the applicable referenced stable fix.
- Use distribution or appliance vendor guidance to identify the exact corrected package for each kernel branch.
- If no update exists, request a vendor-supported mitigation; none is documented in the supplied sources.
Validation and detection
- Inventory running kernel versions across hosts, appliances, containers, and embedded Linux systems.
- Map each kernel package to vendor status and the applicable referenced stable fix.
- After updating, confirm systems booted into the corrected kernel rather than retaining the vulnerable kernel.
- Review which low-privileged local users or workloads can access BPF functionality.
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-2026-43030 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.
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/b52f6d0ef7b308f9d05bbddb78749852f28e8e40CVE reference, Linux
- https://git.kernel.org/stable/c/37db6b9726d0bcf91cbdf9d63b558c50da49f968CVE reference, Linux
- https://git.kernel.org/stable/c/015a74476dc1ab6923d89f1ee009aaf43faa7185CVE reference, Linux
- https://git.kernel.org/stable/c/b99d82706bd1511bb875e3de7154698fd9215c99CVE reference, Linux
- https://git.kernel.org/stable/c/7241da033fdc507b920e092dab1f97b945cb0370CVE reference, Linux
- https://git.kernel.org/stable/c/8aebe18069394f4a79d2d82080a0f806da449996CVE reference, Linux
- https://git.kernel.org/stable/c/ca995b1462ec6db1e869100ba1fb7356bd3f22f0CVE reference, Linux
- https://git.kernel.org/stable/c/a8502a79e832b861e99218cbd2d8f4312d62e225CVE 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.