Security readout for executives and security teams
Plain-English summary
This is a Linux kernel crash risk in the RDMA/cxgb4 driver. A low-privileged local user may be able to trigger a null pointer dereference, causing denial of service. The source bundle does not show remote exploitation or data theft impact.
Executive priority
Treat as routine-to-priority patching for affected Linux infrastructure, especially systems where uptime matters. It is not currently supported as internet-exploited or data-compromising by the provided sources.
Technical view
pass_establish() in Linux RDMA/cxgb4 can dereference ep after get_ep_from_tid() fails to return a non-NULL endpoint. The fix adds a sanity check. CVSS 3.1 is 5.5 with local attack vector, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most relevant to Linux systems using the RDMA/cxgb4 driver path. The affected version data names Linux kernel versions including 4.7, 5.15.99, 6.1.16, 6.2.3, and 6.3, but distribution backports require vendor-specific verification.
Exploitation context
The provided sources do not report active exploitation, and CISA KEV status is false. The CVSS vector indicates exploitation requires local access with low privileges and primarily affects availability, not confidentiality or integrity.
Researcher notes
The vulnerability is CWE-476 in RDMA/cxgb4 pass_establish(). Root cause is missing NULL handling after get_ep_from_tid() lookup failure. Evidence supports local denial of service; source material does not establish a remote path, exploit availability, or broader impact.
Mitigation direction
- Update to a kernel or vendor package containing the referenced stable fixes.
- Check Linux distribution advisories for backported fixes to supported kernels.
- Prioritize hosts where RDMA/cxgb4 is loaded or operationally required.
- If no fixed package is available, follow vendor guidance for reducing driver exposure.
Validation and detection
- Inventory Linux kernel versions and compare against vendor-fixed releases.
- Check whether RDMA/cxgb4-related modules are present and loaded.
- Confirm patched kernels include the referenced stable commits or equivalent backports.
- Review logs for unexplained kernel crashes on exposed systems.
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-476: 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-2023-53335 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/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/9dca64042d855a24b0bd81ce242e5dc7e939f6ebCVE reference, Linux
- https://git.kernel.org/stable/c/2cfc00e974d75a3aa8155f2660f57d342e1f67caCVE reference, Linux
- https://git.kernel.org/stable/c/9ddc77eefb2a567b705c3c86ab2ddabe43cadf1bCVE reference, Linux
- https://git.kernel.org/stable/c/283861a4c52c1ea4df3dd1b6fc75a50796ce3524CVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.