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NVD / CVE Program· CNA illumos

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

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: illumos illumos-gate 6959feb5b430411a4809b06c53dcdb42fb525eac; OmniOS OmniOS r151054bj, r151056aj, r151058j; Triton Data Center SmartOS 20260709.

Low priority for now. Upgrade to illumos illumos-gate 6959feb5b430411a4809b06c53dcdb42fb525eac; OmniOS OmniOS r151054bj, r151056aj, r151058j; Triton Data Center SmartOS 20260709 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.8 · v4.0—No exploit Fix available
Published
Jul 16, 2026
Updated
Jul 17, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · illumos
5.8
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (illumos). Independent of NVD's CPE analysis and usually ahead of it.

  • illumos illumos-gate

    • eae72b5b807baa9116e64502cbb278edf15f3146 and later · before 6959feb5b430411a4809b06c53dcdb42fb525eacaffected · gitfixed in 6959feb5b430411a4809b06c53dcdb42fb525eac

  • OmniOS OmniOS

    • any and later · before r151054affected
    • r151058 and later · before r151058jaffectedfixed in r151058j
    • r151056 and later · before r151056ajaffectedfixed in r151056aj
    • r151054 and later · before r151054bjaffectedfixed in r151054bj

  • Triton Data Center SmartOS

    • any and later · before 202060709affectedfixed in 20260709

Same product

illumos: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-15422SCTP needs to better-check INIT ACK chunk parameters
    36Monitor
  • CVE-2023-31284illumos illumos-gate before 676abcb has a stack buffer overflow in /dev/net, leading to privilege escalation via a stat on a long file name
    31Monitor
  • CVE-2026-104112Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory
    27Monitor

Published before and after this one in the same product

  • Later →CVE-2026-102916Oct 9, 2026 · Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host
    27Monitor
  • Later →CVE-2026-104114Oct 9, 2026 · NULL pointer dereference in illumos nwamd door handler allows local users to crash the daemon
    21Monitor
  • Later →CVE-2026-104115Oct 9, 2026 · Stack buffer overflow in illumos reparsed nfs-basic plugin allows local users to crash the daemon
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
illumos illumos-gate6959feb5b430411a4809b06c53dcdb42fb525eacVendor (CNA)
OmniOS OmniOSr151054bjVendor (CNA)
OmniOS OmniOSr151056ajVendor (CNA)
OmniOS OmniOSr151058jVendor (CNA)
Triton Data Center SmartOS20260709Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-154220 days apartSCTP needs to better-check INIT ACK chunk parameters
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records