Security readout for executives and security teams
Plain-English summary
CVE-2024-27399 is a Linux kernel Bluetooth flaw that can crash the kernel when a timing race leaves an internal L2CAP channel connection pointer null. The public record shows a KASAN proof-of-concept crash, but no KEV listing or active exploitation evidence.
Executive priority
Handle as a routine but timely kernel availability risk. Prioritize Bluetooth-enabled endpoints, embedded Linux devices, and vendor appliances. The evidence supports patching, but not emergency response absent confirmed exposure or exploitation.
Technical view
The issue is a race between l2cap_chan_timeout() and l2cap_chan_del(). l2cap_chan_del() can clear chan->conn, while l2cap_chan_timeout() later dereferences it during mutex_lock(), causing a kernel null pointer dereference. Stable kernel fixes are referenced across maintained branches.
Likely exposure
Exposure is most relevant to Linux systems or appliances running affected kernels with Bluetooth/L2CAP functionality present. The source bundle does not define attack vector, privilege requirements, or reachability, so validation should focus on kernel version, vendor backports, and Bluetooth use.
Exploitation context
The CVE record includes a proof-of-concept-triggered KASAN crash report. It is not listed as CISA KEV in the bundle, and the supplied sources do not claim in-the-wild exploitation.
Researcher notes
The key condition is stale access to chan->conn after channel deletion. The source crash was observed on a 6.9.0-rc5 KASAN build. Affected version data is broad and branch-based, so rely on vendor kernel advisories and backport status rather than upstream version strings alone.
Mitigation direction
- Apply kernel updates from Linux stable or your distribution vendor.
- Prioritize vendor kernels that backport the referenced stable fixes.
- Review Fedora, Debian, NetApp, or platform-specific advisories where applicable.
- If unpatched, follow vendor guidance for temporary Bluetooth risk reduction.
Validation and detection
- Inventory Linux systems and appliances with Bluetooth-capable kernels.
- Map installed kernel packages to vendor fixed releases or backports.
- Confirm fixes corresponding to the referenced stable commits are present.
- Check whether Bluetooth is enabled on exposed laptops, servers, and embedded 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.
CVE-2024-27399 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.
SSVC decision data
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/e137e2ba96e51902dc2878131823a96bf8e638aeCVE reference, Linux
- https://git.kernel.org/stable/c/6466ee65e5b27161c846c73ef407f49dfa1bd1d9CVE reference, Linux
- https://git.kernel.org/stable/c/06acb75e7ed600d0bbf7bff5628aa8f24a97978cCVE reference, Linux
- https://git.kernel.org/stable/c/e97e16433eb4533083b096a3824b93a5ca3aee79CVE reference, Linux
- https://git.kernel.org/stable/c/8960ff650aec70485b40771cd8e6e8c4cb467d33CVE reference, Linux
- https://git.kernel.org/stable/c/955b5b6c54d95b5e7444dfc81c95c8e013f27ac0CVE reference, Linux
- https://git.kernel.org/stable/c/eb86f955488c39526534211f2610e48a5cf8ead4CVE reference, Linux
- https://git.kernel.org/stable/c/adf0398cee86643b8eacde95f17d073d022f782cCVE reference, Linux
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OTB4HWU2PTVW5NEYHHLOCXDKG3PYA534/CVE reference, CVE · x_transferred
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DW2MIOIMOFUSNLHLRYX23AFR36BMKD65/CVE reference, CVE · x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlCVE reference, CVE · x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00019.htmlCVE reference, CVE · x_transferred
- https://security.netapp.com/advisory/ntap-20240926-0001/CVE reference, CVE
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.