CVE-2026-98024

Slab allocator corruption via incorrect folio release

Published Sep 25, 2026 · Updated Sep 25, 2026

Memory deallocation flaw in the s390 ISM driver in affected Linux releases allows attackers to corrupt the slab allocator via an error path. The ism_alloc_dmb() error exit passes a folio_alloc()-allocated buffer to kfree() instead of dropping the folio with folio_put(), and it leaves dmb->cpu_addr uncleared. Reaching the faulty exit requires an s390 system using the ISM driver and an allocation failure; published material identifies allocator corruption but no further consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory deallocation flaw in the s390 ISM driver in affected Linux releases allows attackers to corrupt the slab allocator via an error path. The ism_alloc_dmb() error exit passes a folio_alloc()-allocated buffer to kfree() instead of dropping the folio with folio_put(), and it leaves dmb->cpu_addr uncleared. Reaching the faulty exit requires an s390 system using the ISM driver and an allocation failure; published material identifies allocator corruption but no further consequence.

The record

CVE
CVE-2026-98024
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=121fb75414ab8debafd548bded9d888cd5a8f165
  2. Affected versionversion=6.6.29 <6.7
  3. Affected versionversion=6.8.8 <6.9
  4. Affected versionversion=6.9
  5. Affected versionversion=83781384a96b95e2b6403d3c8a002b2c89031770 <60983356fab0c1171c5cb1b56a36349ebadc608e
  6. Affected versionversion=83781384a96b95e2b6403d3c8a002b2c89031770 <890e2ef726904d1d8328e4b9f5090eeb8761b9d1
  7. Affected versionversion=83781384a96b95e2b6403d3c8a002b2c89031770 <907a56ab3eb8a58500a58daa76087f17bb2b6826
  8. Affected versionversion=83781384a96b95e2b6403d3c8a002b2c89031770 <eebb6a9017b55ac05be770cf7b89f9da49505ae7
  9. Affected versionversion=f3e23edc4917f72139b805f208aeadf23376a0b5

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=121fb75414ab8debafd548bded9d888cd5a8f165; version=6.6.29 <6.7; version=6.8.8 <6.9; version=6.9; version=83781384a96b95e2b6403d3c8a002b2c89031770 <60983356fab0c1171c5cb1b56a36349ebadc608e; version=83781384a96b95e2b6403d3c8a002b2c89031770 <890e2ef726904d1d8328e4b9f5090eeb8761b9d1; version=83781384a96b95e2b6403d3c8a002b2c89031770 <907a56ab3eb8a58500a58daa76087f17bb2b6826; version=83781384a96b95e2b6403d3c8a002b2c89031770 <eebb6a9017b55ac05be770cf7b89f9da49505ae7; version=f3e23edc4917f72139b805f208aeadf23376a0b5

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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