Is there a public exploit for CVE-2026-90589?

No public exploit for CVE-2026-90589 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-90589?

CVE-2026-90589 scores CVSS 5.5 (v3.1), rated medium.

What does CVE-2026-90589 affect?

CVE-2026-90589 affects zephyrproject Zephyr.

5.5 Medium

When CONFIGTHREADSTACKMEMMAPPED is enabled, each thread stack is mapped into the kernel virtual address space with a guard page on either…

CVE-2026-90589

When CONFIGTHREADSTACKMEMMAPPED is enabled, each thread stack is mapped into the kernel virtual address space with a guard page on either side, and the mapping is released during abort cleanup. kthreadabortcleanup() in kernel/thread.c has two paths: a deferred one for self-abort, which stashes the mapping in threadcleanupstackaddr/threadcleanupstacksz, and an immediate one for a thread aborted by some other thread. The immediate path called dothreadcleanup(), which ignored its thread argument and only ever unmapped the stashed address — a value populated exclusively by the self-abort path. The mapped stack of a thread aborted by another thread was therefore never unmapped. Every kthreadabort() of a non-current thread leaks the thread's stack region plus its two guard pages from the kernel virtual address space. Threads that end by returning from their entry function take the working self-abort path, so the leak is specific to explicit cancellation — kthreadabort(), pthreadcancel(), osThreadTerminate(), or the kernel thread kill shell command. Both kthreadcreate() and kthreadabort() are system calls, so with CONFIGUSERSPACE an unprivileged user-mode thread that has been granted a…

Assessment

CVSS: 5.5 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 9 November 2026
Last updated: 9 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

At the source

EUVD (ENISA)

References

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