VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-89439: Linux kernel · platform/x86: ISST: Add a NULL check for sst_inst[]

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f7c9370dd1d3cedb80c635528271cab1d0bcb103 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f7c9370dd1d3cedb80c635528271cab1d0bcb103, ef7975af15126dd70ace519da7bb33f2848b9064, c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa +2

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d805456c712f93ba8a012430f2a93bec133b6ff4, < f7c9370dd1d3cedb80c635528271cab1d0bcb103	Fixed in f7c9370dd1d3cedb80c635528271cab1d0bcb103
LinuxLinux	Affected ≥ d805456c712f93ba8a012430f2a93bec133b6ff4, < ef7975af15126dd70ace519da7bb33f2848b9064	Fixed in ef7975af15126dd70ace519da7bb33f2848b9064
LinuxLinux	Affected ≥ d805456c712f93ba8a012430f2a93bec133b6ff4, < c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa	Fixed in c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa
LinuxLinux	Affected ≥ d805456c712f93ba8a012430f2a93bec133b6ff4, < 49a95fe1f64f41c2e8959e525aefdb10f23b293e	Fixed in 49a95fe1f64f41c2e8959e525aefdb10f23b293e
LinuxLinux	Affected ≥ d805456c712f93ba8a012430f2a93bec133b6ff4, < 3de2776e9d7073765c10c2326c2bda5926811ea6	Fixed in 3de2776e9d7073765c10c2326c2bda5926811ea6
LinuxLinux	Affected =6.4	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Add a NULL check for sst_inst[] To be consistent with other places, add a NULL check for failed socket loading by checking isst_common.sst_inst[].

References

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