Security readout for executives and security teams
Plain-English summary
CVE-2023-53072 is a Linux kernel MPTCP cleanup bug that can leave a socket object used after it was freed. The public record shows it was found through KASAN during testing and fixed in stable kernel commits. No active exploitation is cited in the provided sources.
Executive priority
Treat as a kernel maintenance priority, not an emergency based on current evidence. Patch through normal urgent kernel update cycles, especially on exposed or shared infrastructure, because use-after-free bugs can have serious consequences even when public exploit evidence is absent.
Technical view
The flaw is a use-after-free in MPTCP token lookup after passive socket initialization changes. The fix moves destruction of unaccepted sockets through MPTCP workqueue cleanup so paired MPTCP resources are released in order and the MPTCP socket is released last.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions with MPTCP code present and relevant socket paths reachable. The provided data names Linux kernel versions around 5.7 through stable fixes, but does not provide distribution package mappings.
Exploitation context
The bundle shows a KASAN crash from a syzkaller-style executor path. It does not cite public exploitation, KEV listing, exploit availability, privilege requirements, or a confirmed real-world attack path.
Researcher notes
Key unknowns are practical exploitability, required local or remote reachability, and distro-specific affected ranges. The strongest evidence is the kernel commit narrative and KASAN trace; there is no CVSS, CWE, KEV, or exploit confirmation in the provided bundle.
Mitigation direction
- Update to a Linux kernel containing the referenced stable fixes.
- Use distribution security advisories to map fixed package versions.
- Prioritize internet-facing or multi-tenant systems where MPTCP is enabled or used.
- Check vendor guidance before applying non-patch mitigations.
- Avoid direct deployment shortcuts; follow normal kernel change controls.
Validation and detection
- Inventory Linux kernel versions across servers, appliances, and container hosts.
- Check whether deployed kernels include the referenced stable commits.
- Confirm distribution advisories map CVE-2023-53072 to installed packages.
- Review MPTCP usage or configuration where operationally relevant.
- Run regression tests for networking workloads 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.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-53072 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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/2827f099b3fb9a59263c997400e9182f5d423e84CVE reference, Linux
- https://git.kernel.org/stable/c/804cf487fb0031f3c74755b78d8663333f0ba636CVE reference, Linux
- https://git.kernel.org/stable/c/b6985b9b82954caa53f862d6059d06c0526254f0CVE 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.