Vulnerability Description
A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in usr/src/uts/common/io/dld/dld_drv.c copies the dld_ioc_macprop_t ioctl header in once to read its pr_valsize field, sizes and allocates a kernel heap buffer from that value, and then copies the full request in a second time from the same unprivileged user address. A concurrent thread can enlarge pr_valsize between the two copyins, so the second copyin and the subsequent property handling write beyond the end of the undersized allocation and corrupt the kernel heap. An unprivileged local user, including one confined to a non-global zone that owns a datalink, can trigger this to panic the system. The resulting kernel heap corruption may be usable for further compromise.
Related Weaknesses (CWE)
References
- https://github.com/illumos/illumos-gate/commit/6959feb5b430411a4809b06c53dcdb42f
- https://illumos.org/issues/18020
- https://illumos.topicbox.com/groups/developer/T923147fae854a738-M03c29e1be33dac2
FAQ
What is CVE-2026-15449?
CVE-2026-15449 is a documented vulnerability. A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in u...
How severe is CVE-2026-15449?
CVSS scoring is not yet available for CVE-2026-15449. Check NVD for updates.
Is there a patch for CVE-2026-15449?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.