CVE-2026-4652: On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT comma

Routine

HIGH 7.5REMOTEMITIGATE

CVE-2026-4652 is a high-severity flaw (CVSS 7.5) affecting freebsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT command for an I/O queue with a bogus or stale CNTLID. An attacker with network access to the NVMe/TCP target can trigger an unauthenticated Denial of Service condition on the affected machine.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): FreeBSD · Vendor: freebsd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 07:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

freebsd freebsd MITIGATE

Affected: 15.0 · 15.0 p1 · 15.0 p2 · 15.0 p3 · 15.0 p4

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4652?

freebsd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4652 being exploited?

CVE-2026-4652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4652 affect?

CVE-2026-4652 affects freebsd. Severity is high (CVSS 7.5). On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT command for an I/O queue with a bogus or stale CNTLID. An attacker with network access to the NVMe/TCP target can trigger an unauthent

How urgent is CVE-2026-4652?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-58082 CRITICAL 9.8 MITIGATE The ISO-2022 encoding module used a stack buffer sized to MB_LEN_MAX (6 bytes) for intermediate character outp
CVE-2026-58081 CRITICAL 9.8 MITIGATE Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly check the size of the caller-sup
CVE-2026-58085 HIGH 7.5 MITIGATE After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whethe
CVE-2026-58086 HIGH 8.1 MITIGATE As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user
CVE-2026-58083 HIGH 8.4 MITIGATE While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued

References

← Back to latest CVEs