Security readout for executives and security teams
Plain-English summary
A malformed network RESPONSE can exploit a Linux kernel length-check error and trigger a kernel assertion, potentially crashing the system. The documented impact is loss of availability, not data theft or modification. Risk is highest where the affected RxRPC/RXGK processing path is network-reachable.
Executive priority
Treat as a prompt availability-risk update for exposed or critical Linux systems. Prioritize internet-facing and high-availability workloads, while validating actual RxRPC/RXGK exposure and vendor package status before declaring broad impact.
Technical view
rxgk_verify_response() reverses the intended bounds check for the decoded authenticator length. An oversized value can reach rxgk_decrypt_skb() and then skb_to_sgvec() with an impossible length, triggering BUG_ON(len). The kernel fix rejects authenticator lengths exceeding the packet’s remaining payload.
Likely exposure
Potentially exposed systems run an affected Linux kernel and have the RxRPC/RXGK path present and network-reachable. The supplied version data does not clearly express exact ranges or distribution backports, so kernel package status must be confirmed through the applicable vendor.
Exploitation context
The CVSS vector describes network-accessible, low-complexity, unauthenticated denial of service without user interaction. A public repository is tagged as an exploit reference, but the supplied evidence does not establish its reliability or active exploitation. This CVE is not listed as KEV in the bundle.
Researcher notes
The root cause is CWE-130-style improper length interpretation: an inverted remaining-payload comparison admits an oversized authenticator. The demonstrated failure reaches a kernel BUG_ON through workqueue-based connection processing. Source data supports denial of service; it does not support confidentiality, integrity, code-execution, or in-the-wild exploitation claims.
Mitigation direction
- Install a vendor kernel containing the applicable upstream or stable fix.
- Check Linux distribution guidance for fixed package versions and backports.
- Prioritize network-reachable systems using the RxRPC/RXGK processing path.
- Reboot into the corrected kernel after installation, where required.
Validation and detection
- Inventory running kernel versions on potentially exposed Linux systems.
- Confirm the installed package includes the fix or an equivalent vendor backport.
- Verify systems are running the corrected kernel after remediation.
- Review kernel logs for skb_to_sgvec assertions or related RxRPC crashes.
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.
CWE-130: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-31635 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.
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: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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/beee051f259acd286fed64c32c2b31e6f5097eb5CVE reference, Linux
- https://git.kernel.org/stable/c/e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305CVE reference, Linux
- https://git.kernel.org/stable/c/a2567217ade970ecc458144b6be469bc015b23e5CVE reference, Linux
- https://github.com/v12-security/pocs/tree/main/dirtydecryptCVE reference, CISA-ADP · exploit
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.
Improper Handling of Length Parameter Inconsistency
Improper Handling of Length Parameter Inconsistency represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.