VulnerabilityPublished 16 Sep 2026Updated 30 Oct 2026

CVE-2026-89955: Linux kernel · s390/vfio-ap: Fix NULL deref in status_show() during queue probe

Source GCVE Database

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Authoritative record:CVE-2026-89955· Medium

Not known to be exploited · fixed in e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:20 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9, dd6f4ef6f8a37412909ad787c837332fb070159c, 69632952aca04caa71e49953b6949fc04e788e67 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

ghsa-6vjc-f3pw-3x6w

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9	Fixed in e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < dd6f4ef6f8a37412909ad787c837332fb070159c	Fixed in dd6f4ef6f8a37412909ad787c837332fb070159c
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < 69632952aca04caa71e49953b6949fc04e788e67	Fixed in 69632952aca04caa71e49953b6949fc04e788e67
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < 10606c9af18baed75cd180b96ee695441aa15134	Fixed in 10606c9af18baed75cd180b96ee695441aa15134
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < 31fa0a8a3c337ed2d200166d6926ab23c14f8b2e	Fixed in 31fa0a8a3c337ed2d200166d6926ab23c14f8b2e
LinuxLinux	Affected ≥ 260f3ea141382386e97611e7c2029bc013088ab1, < 7db2511fc601ca3a6e3fb1bdce02261c3c3167c3	Fixed in 7db2511fc601ca3a6e3fb1bdce02261c3c3167c3

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by acquiring update locks before creating the sysfs attribute group. Users should apply the official kernel updates that include this fix. No additional mitigation steps are indicated.

Description

A NULL pointer dereference vulnerability was identified and fixed in the Linux kernel's s390/vfio-ap driver. The issue occurs during the creation of a sysfs attribute group in vfio_ap_mdev_probe_queue(), where the queue's driver data is not yet set. Concurrent reads of the 'status' attribute can lead to a NULL pointer dereference, causing potential kernel crashes. The fix involves acquiring update locks before creating the sysfs group to prevent concurrent access to uninitialized data.

References

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