CVE-2026-15449: TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption
illumos · illumos-gate
Vendor fix available · Affected: illumos-gate · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 1% of scored CVEs
DescriptionCVE.org
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 products3
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- illumos · illumos-gateVersions not stated
- OmniOS · OmniOSfrom any before r151054; from r151058 before r151058j; from r151056 before r151056aj; from r151054 before r151054bj
- Triton Data Center · SmartOSfrom any before 202060709
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No CyberSIXT article names CVE-2026-15449 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.