VulnerabilityPublished 25 Sep 2026Updated 19 Oct 2026

CVE-2026-98024: Linux kernel · s390/ism: folio_put() after error

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in eebb6a9017b55ac05be770cf7b89f9da49505ae7 : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in eebb6a9017b55ac05be770cf7b89f9da49505ae7, 60983356fab0c1171c5cb1b56a36349ebadc608e, 907a56ab3eb8a58500a58daa76087f17bb2b6826 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 25 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 >=6.6.29 <6.6.158 >=6.8.8 <6.9	Fixed in eebb6a9017b55ac05be770cf7b89f9da49505ae7 60983356fab0c1171c5cb1b56a36349ebadc608e 907a56ab3eb8a58500a58daa76087f17bb2b6826 890e2ef726904d1d8328e4b9f5090eeb8761b9d1 90f6f5cb331af52b14c0f309fb27dc243e8e2982 6.9 6.6.158
LinuxLinux	Affected =6.9	Fixed in–

AI-suggested

A patch is available and has been applied in Linux kernel versions 6.6.158, 6.9, and related commits. Users and administrators should update affected Linux kernel versions to these fixed releases to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's s390/ism subsystem involves improper memory deallocation in the folio_put() function after an error in ism_alloc_dmb(). This flaw could lead to slab allocator corruption and potential use-after-free (UAF) conditions due to failure to reset a pointer after freeing memory. The issue affects specific Linux kernel versions and has been addressed in subsequent fixes.

Impact

The improper memory deallocation can cause slab allocator corruption, which may lead to kernel instability or crashes. The failure to reset the pointer after freeing memory introduces a risk of use-after-free, potentially allowing attackers to exploit this for arbitrary code execution or privilege escalation. However, no known exploits in the wild have been reported.

Summary

The Linux kernel s390/ism subsystem had a vulnerability where dmb->cpu_addr, allocated via folio_alloc(), was incorrectly freed using kfree() instead of folio_put() in the error path of ism_alloc_dmb(). This misuse could corrupt the slab allocator. Additionally, the pointer dmb->cpu_addr was not reset after folio_put(), risking unintentional use-after-free by future callers. The vulnerability affects Linux kernel versions >=6.6.29 <6.6.158, >=6.8.8 <6.9, and =6.9. Multiple fixes have been committed to address this issue.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 13:05 UTC

Technical details

References

Community reviews

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