Security readout for executives and security teams
Plain-English summary
CVE-2023-53304 is a Linux kernel netfilter issue that can affect system availability. A local authenticated user may be able to trigger a kernel failure path related to nftables interval set cleanup. The provided sources do not show data theft, integrity impact, or remote attack exposure.
Executive priority
Treat as a scheduled kernel maintenance item unless the environment hosts untrusted local users or workloads. Availability impact can be serious, but the available evidence indicates local privilege is required and no active exploitation is cited.
Technical view
The bug is in netfilter nft_set_rbtree interval handling. Lazy garbage collection during insert can mishandle expired interval entries, including incorrect previous-node handling and generation-mask checks. CVSS rates this local, low-complexity, low-privilege, no-user-interaction issue as availability-only impact.
Likely exposure
Exposure is most relevant to Linux hosts using affected kernel builds with netfilter/nftables support available to local users or workloads. Internet exposure alone is not enough based on the CVSS vector; local access or local code execution is required.
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation. The CVE text references a reproducible nftables test and kmemleak-enabled kernel, but that is validation context, not proof of weaponized exploitation.
Researcher notes
Focus review on nft_set_rbtree interval-set expiration and lazy garbage-collection behavior. The provided record names pointer selection and generation-mask validation issues. Avoid assuming exploitability beyond local availability impact without additional kernel, namespace, and capability context.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the linked stable netfilter fixes.
- Prioritize multi-user Linux systems, container hosts, and systems allowing untrusted local workloads.
- Review distribution advisories for exact fixed package versions before scheduling rollout.
- Restrict unnecessary local access to nftables/netfilter management capabilities.
Validation and detection
- Inventory Linux kernel versions across servers, containers hosts, and appliances.
- Check whether kernels include the referenced upstream stable commits or downstream vendor backports.
- Confirm nftables/netfilter is present and relevant to local workload exposure.
- Run vendor-recommended regression tests after kernel updates.
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
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Open ATT&CK lookupCVE-2023-53304 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/8284a79136c384059e85e278da2210b809730287CVE reference, Linux
- https://git.kernel.org/stable/c/acaee227cf79c45a5d2d49c3e9a66333a462802cCVE reference, Linux
- https://git.kernel.org/stable/c/893cb3c3513cf661a0ff45fe0cfa83fe27131f76CVE reference, Linux
- https://git.kernel.org/stable/c/50cbb9d195c197af671869c8cadce3bd483735a0CVE reference, Linux
- https://git.kernel.org/stable/c/89a4d1a89751a0fbd520e64091873e19cc0979e8CVE reference, Linux
- https://git.kernel.org/stable/c/cd66733932399475fe933cb3ec03e687ed401462CVE reference, Linux
- https://git.kernel.org/stable/c/f718863aca469a109895cb855e6b81fff4827d71CVE 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.