CVE-2026-15449

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/illumos/illumos-gate/commit/6959feb5b430411a4809b06c53dcdb42fb525eac
https://illumos.org/issues/18020
https://illumos.topicbox.com/groups/developer/T923147fae854a738-M03c29e1be33dac2a5e3d9535/18020-double-copyin-of-dldioc-consumers

Configurations

No configuration.

History

16 Jul 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-16 20:16

Updated : 2026-07-17 18:45

NVD link : CVE-2026-15449

Mitre link : CVE-2026-15449

CVE.ORG link : CVE-2026-15449

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

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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."}], "lastModified": "2026-07-17T18:45:53.333", "sourceIdentifier": "0ca53633-f0b5-4853-ba72-e0a2e62000d0"}