PT-2026-60562 · Omnios+2 · Omnios+2
CVSS v4.0
5.8
Medium
| Vector | AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N |
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.
Fix
Heap Based Buffer Overflow
Time Of Check To Time Of Use
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Related Identifiers
Affected Products
Omnios
Smartos
Illumos-Gate