Security readout for executives and security teams
Plain-English summary
A Linux kernel flaw in RDS/TCP connection handling can leave failed connections stuck during shutdown. A remote, unauthenticated trigger is reflected in the supplied CVSS assessment, and the documented impact is service availability rather than data theft or modification. Exposure depends on whether affected systems use reachable RDS/TCP functionality.
Executive priority
Treat this as an expedited availability-risk update for exposed or business-critical RDS deployments. Systems not using RDS/TCP are lower priority after verification. Because active exploitation is not established and affected-version data is ambiguous, prioritize using confirmed feature usage, network reachability, vendor package status, and service criticality.
Technical view
RDS/TCP multipath can transition a connection directly from RDS_CONN_ERROR to RDS_CONN_CONNECTING. Later callback reset processing may enter RDS_CONN_RESETTING while shutdown work is queued. The shutdown handler rejects that state, drops the connection, and can leave RDS_SHUTDOWN_WORK_QUEUED set indefinitely. The kernel fixes enforce the shutdown path and accept RESETTING during shutdown initialization.
Likely exposure
The supplied assessment rates exploitation as network-based, low-complexity, unauthenticated, and requiring no user interaction. Practical exposure is greatest on affected Linux systems using RDS over TCP, particularly multipath, where relevant connectivity is reachable. The bundle's version data is irregular, so distribution-specific kernel status should be verified rather than inferred solely from version numbers.
Exploitation context
The bundle does not report known active exploitation, and CVE-2026-43226 is not marked as CISA KEV. It provides no public proof-of-concept evidence. The high rating comes from potential remotely triggered availability loss, not demonstrated attacks. Real-world exploitability remains dependent on RDS/TCP deployment and reachability.
Researcher notes
The vulnerable path involves an unexpected state-machine sequence and permanently queued shutdown work, suggesting connection handling or service degradation rather than confidentiality or integrity compromise. The bundle lists duplicated commit identifiers, unusual version entries, and conflicting default-status groupings. Researchers should rely on vendor backport records and cited stable commits for exact build applicability.
Mitigation direction
- Apply a vendor-supported kernel update containing the applicable cited stable fix.
- Confirm the distribution advisory maps its packaged kernel to CVE-2026-43226.
- Prioritize reachable systems actively using RDS over TCP or multipath.
- If patching is delayed, consult the vendor for supported mitigations; the bundle names none.
Validation and detection
- Inventory kernel versions and identify systems where RDS networking is enabled or used.
- Determine whether RDS/TCP and multipath connectivity is reachable from untrusted networks.
- Check vendor advisories or changelogs for CVE-2026-43226 or the cited fix commits.
- After updating, confirm the running kernel includes the fix and dependent RDS services operate normally.
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-2026-43226 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/9bcd7c00691a2db9745817d5ea79262a503b135cCVE reference, Linux
- https://git.kernel.org/stable/c/a179ac7be8f5a650d0068040705f4cddd6ca369cCVE reference, Linux
- https://git.kernel.org/stable/c/19e384a7d00d888303a8285977cdf1970c6cccd6CVE reference, Linux
- https://git.kernel.org/stable/c/f0f729bdffb08af32e0f54521b81b8a9e0321f16CVE reference, Linux
- https://git.kernel.org/stable/c/81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8CVE reference, Linux
- https://git.kernel.org/stable/c/899ef00963ce76f9fc421a7d02335fe4ead6389bCVE reference, Linux
- https://git.kernel.org/stable/c/9ff599a9be784a808c36765086e3db2144aa3b66CVE reference, Linux
- https://git.kernel.org/stable/c/ad22d24be635c6beab6a1fdd3f8b1f3c478d15daCVE reference, Linux
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.