Security readout for executives and security teams
Plain-English summary
CVE-2023-53402 is a Linux kernel memory leak in printk debugfs cleanup logic. A local, low-privileged user could potentially contribute to memory exhaustion, affecting system availability. The source bundle does not show data theft, integrity impact, or remote exploitation.
Executive priority
Treat as scheduled remediation, not emergency response, unless exposed systems allow many untrusted local users. The main business risk is service disruption from memory exhaustion, not confidentiality loss or remote compromise.
Technical view
The flaw is CWE-401 in kernel/printk/index.c. debugfs_lookup() returned a reference that was not released with dput(), leaking memory over time. The kernel fix replaces the pattern with debugfs_lookup_and_remove(), which handles lookup, removal, and reference cleanup.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions listed in the source bundle, including 5.15, 5.15.100, 6.1.18, 6.2.5, and 6.3 entries. Distro backports may change exact status, so kernel package advisories matter.
Exploitation context
The CVSS vector is local, low complexity, low privilege, no user interaction, with high availability impact only. The bundle says KEV is false and provides no cited evidence of active exploitation or public weaponization.
Researcher notes
The source evidence is concise and code-focused. It identifies the missing dput() after debugfs_lookup() and the stable fix approach, but does not document a concrete trigger path, affected distributions, or exploitation in the wild.
Mitigation direction
- Apply Linux kernel or distribution updates containing the referenced stable fixes.
- Check vendor advisories for backported fixes in supported distro kernels.
- Prioritize multi-user systems where untrusted local users have shell or workload access.
- Monitor systems for abnormal memory pressure until patched.
Validation and detection
- Inventory running kernel versions across Linux hosts.
- Compare kernel builds against vendor fixed versions or linked stable commits.
- Review package changelogs for the printk debugfs memory leak fix.
- Confirm no affected kernels remain on high-risk multi-user 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-401: 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-2023-53402 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/2e07fa2e30d48d24a791483774a3d4b76769e0cfCVE reference, Linux
- https://git.kernel.org/stable/c/c578a68ffcdc2e8c72556bebdaae2b7500398e81CVE reference, Linux
- https://git.kernel.org/stable/c/13969236b6900b5a3625ad2193569588e978f1ccCVE reference, Linux
- https://git.kernel.org/stable/c/55bf243c514553e907efcf2bda92ba090eca8c64CVE 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.
Missing Release of Memory after Effective Lifetime
Missing Release of Memory after Effective Lifetime represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.