CVE-2026-10671: In Zephyr's kernel pipe implementation, the userspace syscall verifier z_vrfy_k_pipe_init() in kernel/pipe.c u

Q: How do I fix CVE-2026-10671?

zephyr: upgrade to 4.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-10671 being exploited?

CVE-2026-10671 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-10671 affect?

CVE-2026-10671 affects zephyr. Severity is high (CVSS 7.1). In Zephyr's kernel pipe implementation, the userspace syscall verifier z_vrfy_k_pipe_init() in kernel/pipe.c used K_SYSCALL_OBJ() (which requires the kernel object to already be initialized) instead of K_SYSCALL_OBJ_NEVER_INIT() (which reje

Q: How urgent is CVE-2026-10671?

Priority 31/100. High severity; Public exploit reference

Routine

HIGH 7.1UPGRADE

CVE-2026-10671 is a high-severity flaw (CVSS 7.1) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Zephyr's kernel pipe implementation, the userspace syscall verifier z_vrfy_k_pipe_init() in kernel/pipe.c used K_SYSCALL_OBJ() (which requires the kernel object to already be initialized) instead of K_SYSCALL_OBJ_NEVER_INIT() (which rejects an already-initialized object). As a result, on CONFIG_USERSPACE builds an unprivileged user thread that has been granted access to a k_pipe object can invoke the k_pipe_init syscall to re-initialize a pipe

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-825, CWE-1188
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 15:16 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

zephyrproject zephyr UPGRADE

Affected: >= 4.1.0 and < 4.5.0

Fixed in: 4.5.0

Safe to downgrade to: a release before 4.1.0

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-2026-10671?

zephyr: upgrade to 4.5.0. Exact commands for each OS are on this page.

Is CVE-2026-10671 being exploited?

CVE-2026-10671 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-2026-10671 affect?

CVE-2026-10671 affects zephyr. Severity is high (CVSS 7.1). In Zephyr's kernel pipe implementation, the userspace syscall verifier z_vrfy_k_pipe_init() in kernel/pipe.c used K_SYSCALL_OBJ() (which requires the kernel object to already be initialized) instead of K_SYSCALL_OBJ_NEVER_INIT() (which reje

How urgent is CVE-2026-10671?

Priority 31/100. High severity; Public exploit reference

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References

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