CVE-2026-15449 (GCVE-0-2026-15449)

Vulnerability from cvelistv5 – Published: 2026-07-16 19:27 – Updated: 2026-07-16 19:27
VLAI
Title
TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption
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.
Severity
5.8 (Medium)
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
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version
illumos illumos-gate Affected: eae72b5b807baa9116e64502cbb278edf15f3146 , < 6959feb5b430411a4809b06c53dcdb42fb525eac (git)
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OmniOS OmniOS Affected: any , < r151054 (custom)
Affected: r151058 , < r151058j (custom)
Affected: r151056 , < r151056aj (custom)
Affected: r151054 , < r151054bj (custom)
Create a notification for this product.
Triton Data Center SmartOS Affected: any , < 202060709 (custom)
Create a notification for this product.
Date Public
2026-07-08 19:00
Credits
Nick Wilkens of Edgecast Cloud Dan McDonald
Show details on NVD website
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              "value": "\u003cpre\u003eA 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.\u003c/pre\u003e"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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