Security readout for executives and security teams
Plain-English summary
This is a Linux kernel bug in the mxs-auart serial driver used on some embedded Freescale/NXP MXS systems. A missing lock can trigger a kernel warning during CTS signal handling, observed when Bluetooth loads on an i.MX28 board. The sources do not show active exploitation or a scored severity.
Executive priority
Handle through normal kernel maintenance, with higher priority for embedded products using affected MXS serial hardware. There is no supplied evidence of active exploitation, but patched kernels reduce operational instability and support risk.
Technical view
uart_handle_cts_change() expects uport->lock to be held. The mxs-auart interrupt path called it while changing CTS state without that spinlock, violating serial_core locking expectations and producing a kernel splat. Upstream stable commits add the missing locking around CTS state changes.
Likely exposure
Exposure appears limited to Linux systems using the mxs-auart serial driver, such as MXS/i.MX28 embedded boards, especially where Bluetooth or serial hardware flow control uses CTS. Typical cloud servers and desktops are unlikely to be affected unless this driver and hardware path are present.
Exploitation context
The supplied sources provide no CVSS score, CWE, KEV listing, public exploit evidence, or attacker-controlled exploitation path. Evidence is a kernel warning and upstream stable fixes. Treat this as reliability and kernel correctness risk unless vendor advisories identify stronger impact.
Researcher notes
The core issue is a serial_core locking contract violation in mxs_auart_irq_handle. The source bundle does not establish memory corruption, privilege escalation, remote reachability, or exploitability. Validate exposure by driver and hardware presence, not by Linux version alone.
Mitigation direction
- Update to a vendor or distribution kernel containing the upstream stable fix.
- Apply relevant Debian LTS or Fedora kernel updates where those distributions are used.
- For embedded BSPs, ask the vendor whether the mxs-auart stable patch is included.
- Prioritize systems with MXS/i.MX28 hardware, Bluetooth, or CTS hardware flow control.
Validation and detection
- Inventory Linux devices using the mxs-auart driver or MXS/i.MX28 device trees.
- Confirm the running kernel includes one of the referenced upstream stable commits or distro fixes.
- Check kernel logs for uart_handle_cts_change or mxs_auart_irq_handle warnings.
- After updating, regression test Bluetooth and serial CTS flow-control behavior.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit 56434e295bd4
- Linux stable commit 21535ef0ac19
- Linux stable commit 0dc0637e6b16
- Linux stable commit 479244d68f5d
- Linux stable commit 2c9b943e9924
- Linux stable commit 5f40fd6ca2cf
- Linux stable commit 94b0e65c75f4
- Linux stable commit 54c4ec5f8c47
- Debian LTS announcement
- Fedora package announcement
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
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ATT&CK lookup starting points
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CVE-2024-27000 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/56434e295bd446142025913bfdf1587f5e1970adCVE reference, Linux
- https://git.kernel.org/stable/c/21535ef0ac1945080198fe3e4347ea498205c99aCVE reference, Linux
- https://git.kernel.org/stable/c/0dc0637e6b16158af85945425821bfd0151adb37CVE reference, Linux
- https://git.kernel.org/stable/c/479244d68f5d94f3903eced52b093c1e01ddb495CVE reference, Linux
- https://git.kernel.org/stable/c/2c9b943e9924cf1269e44289bc5e60e51b0f5270CVE reference, Linux
- https://git.kernel.org/stable/c/5f40fd6ca2cf0bfbc5a5c9e403dfce8ca899ba37CVE reference, Linux
- https://git.kernel.org/stable/c/94b0e65c75f4af888ab2dd6c90f060f762924e86CVE reference, Linux
- https://git.kernel.org/stable/c/54c4ec5f8c471b7c1137a1f769648549c423c026CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlCVE reference, CVE · x_transferred
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/CVE reference, CVE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/CVE reference, CVE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/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.