Security readout for executives and security teams
Plain-English summary
A Linux netfilter cleanup flaw can leave a pointer referencing freed memory. If connection tracking fails during startup and a helper module is loaded afterward, the kernel may corrupt memory. Successful abuse could compromise system confidentiality, integrity, or availability, but the required failure sequence limits likely exposure.
Executive priority
Schedule expedited remediation for affected multi-user, container-hosting, or otherwise locally accessible Linux systems. Prioritize hosts showing conntrack initialization failures or using helper modules. Treat this as high-priority maintenance rather than a confirmed active incident because exploitation evidence is absent and the triggering state is specific.
Technical view
When nf_conntrack_init_start() fails, its cleanup path frees nf_ct_helper_hash. With NF_CONNTRACK built in, later loading a conntrack helper module can reach nf_conntrack_helper_register() and use the dangling pointer. The stable fix prevents access when the hash is freed or uninitialized. CVSS 3.1 is 7.8: local access, low complexity, low privileges, no user interaction.
Likely exposure
Exposure requires an affected Linux kernel with NF_CONNTRACK enabled, failed connection-tracking initialization, and subsequent conntrack helper-module loading. The bundle lists several affected releases through 6.5, but its version representation is ambiguous for distribution kernels. Internet reachability alone is insufficient; verify each vendor kernel against the applicable stable fix.
Exploitation context
The supplied CVSS vector describes a local, low-privilege attack context. However, the source bundle does not explain how an attacker reliably induces every prerequisite. The CVE is not marked as KEV, and the provided sources contain no evidence of active exploitation or a public exploit.
Researcher notes
The essential state transition is failed conntrack initialization, cleanup of nf_ct_helper_hash, then later helper registration through another module. Assessment should distinguish vulnerable source lineage from distribution backports. The bundle provides eight branch-specific stable commits but does not identify downstream package mappings, reliable triggering conditions, public proof-of-concept availability, or observed exploitation.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the applicable referenced stable fix.
- Follow distribution guidance because the bundle does not map fixes to downstream package versions.
- After conntrack initialization failure, avoid loading helper modules until rebooting into a confirmed fixed kernel.
Validation and detection
- Record each running kernel release and vendor build, then compare it with vendor security guidance.
- Confirm whether affected systems build NF_CONNTRACK into the kernel.
- Review kernel logs for conntrack initialization or register_nf_conntrack_bpf failures.
- Identify systems that load FTP or other conntrack helper modules.
- After updating, verify the fixed kernel is running and test required netfilter functionality.
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-2023-53619 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7CVE reference, Linux
- https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0CVE reference, Linux
- https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9CVE reference, Linux
- https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175CVE reference, Linux
- https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566CVE reference, Linux
- https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034CVE reference, Linux
- https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7CVE reference, Linux
- https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309bCVE 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.