CVE-2026-15449

Summary

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.

Affected Software

VendorProductVersion RangeStatus
illumosillumos-gateeae72b5b807baa9116e64502cbb278edf15f3146 < 6959feb5b430411a4809b06c53dcdb42fb525eacaffected
OmniOSOmniOSany < r151054affected
OmniOSOmniOSr151058 < r151058jaffected
OmniOSOmniOSr151056 < r151056ajaffected
OmniOSOmniOSr151054 < r151054bjaffected
Triton Data CenterSmartOSany < 202060709affected

Weaknesses

  • CWE-367: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-122: CWE-122 Heap-based Buffer Overflow

Workarounds

No mitigation is available. The referenced notification includes a DTrace script that detects exploitation attempts.

References