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CVE-2026-15449— TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption

AI Predicted 7.8 Difficulty: Hard
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I. Basic Information for CVE-2026-15449

Vulnerability Information
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Vulnerability Title
TOCTOU double copyin in illumos dld ioctl handling causes kernel heap corruption
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
illumosillumos-gate eae72b5b807baa9116e64502cbb278edf15f3146 ~ 6959feb5b430411a4809b06c53dcdb42fb525eac -
OmniOSOmniOS any ~ r151054 -
Triton Data CenterSmartOS any ~ 202060709 -

II. Public POCs for CVE-2026-15449

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III. Intelligence Information for CVE-2026-15449

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Patches & Fixes for CVE-2026-15449 (1)

Other References for CVE-2026-15449 (1)

Other References for CVE-2026-15449 (1)

IV. Related Vulnerabilities

Same product: illumos-gate
Same vendor: illumos
Same weakness: CWE-367

V. Comments for CVE-2026-15449

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