5.8

CVE-2026-15449

TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerillumos
≫
Produkt illumos-gate
Default Statusaffected
Version eae72b5b807baa9116e64502cbb278edf15f3146
Version < 6959feb5b430411a4809b06c53dcdb42fb525eac
Status affected
HerstellerOmniOS
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Produkt OmniOS
Default Statusaffected
Version any
Version < r151054
Status affected
Version r151058
Version < r151058j
Status affected
Version r151056
Version < r151056aj
Status affected
Version r151054
Version < r151054bj
Status affected
HerstellerTriton Data Center
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Produkt SmartOS
Default Statusaffected
Version any
Version < 202060709
Status affected
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.08% 0.004
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
0ca53633-f0b5-4853-ba72-e0a2e62000d0 5.8 0 0
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-122 Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

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