Security readout for executives and security teams
Plain-English summary
CVE-2023-53209 is a Linux kernel availability flaw in the mac80211_hwsim Wi-Fi simulation area. A local user with low privileges could trigger a NULL pointer dereference, potentially crashing the kernel. The sources do not indicate data theft, privilege escalation, remote access, or active exploitation.
Executive priority
Handle through normal kernel patch management, with higher priority on shared systems, test infrastructure, or endpoints allowing untrusted local users. There is no sourced evidence of active exploitation or remote compromise.
Technical view
The flaw is CWE-476 in Linux mac80211_hwsim. mac80211_hwsim_select_tx_link() could dereference a NULL sta pointer. CVSS 3.1 is 5.5 with local attack vector, low complexity, low privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most likely on Linux systems with affected kernel versions or builds containing the vulnerable mac80211_hwsim code. The available source bundle points to Linux 6.1 through 6.5 ranges, but distro backport status must be verified with vendor kernel advisories.
Exploitation context
No CISA KEV listing is provided, and the cited sources do not claim active exploitation. The CVSS vector indicates exploitation requires local access and low privileges. Expected impact is denial of service rather than confidentiality or integrity compromise.
Researcher notes
The key condition is a missing NULL check before accessing sta in mac80211_hwsim_select_tx_link(). Source evidence is limited to the CVE record, CVSS metadata, and stable kernel fix references; affected distro package mapping is not included.
Mitigation direction
- Update to a vendor kernel containing the referenced stable fixes.
- Prioritize affected systems where untrusted local users can run code.
- Check distribution advisories for backported fixes and exact package versions.
- Limit availability of unnecessary kernel modules where operationally safe.
- Track this as an availability risk, not a remote compromise issue.
Validation and detection
- Inventory running Linux kernel versions and vendor package revisions.
- Confirm whether vendor packages include the referenced stable commits.
- Check whether mac80211_hwsim is present, loadable, or used in testing workflows.
- Review kernel crash reports for NULL dereferences in mac80211_hwsim code.
- Document distro-specific affected and fixed version conclusions.
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-2023-53209 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/d0124848c7940aba73492e282506b32a13f2e30eCVE reference, Linux
- https://git.kernel.org/stable/c/a8a20fed3e05b3a6866c5c58855deaf3c217ccd6CVE reference, Linux
- https://git.kernel.org/stable/c/0cc80943ef518a1c51a1111e9346d1daf11dd545CVE 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.