CVE-2026-98024: Linux kernel · s390/ism: folio_put() after error
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · 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.
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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that replaces kfree() with folio_put() in the error handling path of ism_alloc_dmb() and resets the pointer to prevent use-after-free. Users should apply the official kernel updates that include this patch to affected versions.
Description
A vulnerability in the Linux kernel's s390/ism subsystem was resolved involving improper memory deallocation after an error in ism_alloc_dmb(). The issue was caused by using kfree() instead of folio_put() to free memory, which could lead to slab allocator corruption and potential use-after-free (UAF) conditions. The fix involves using folio_put() and resetting the pointer to avoid unintentional UAF by future callers.
References
- ubuntu.com/security/CVE-2026-98024 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98024 (opens in a new tab)
- git.kernel.org/stable/c/60983356fab0c1171c5cb1b56a36349ebadc608e (opens in a new tab)
- git.kernel.org/stable/c/890e2ef726904d1d8328e4b9f5090eeb8761b9d1 (opens in a new tab)
- git.kernel.org/stable/c/eebb6a9017b55ac05be770cf7b89f9da49505ae7 (opens in a new tab)
- git.kernel.org/stable/c/907a56ab3eb8a58500a58daa76087f17bb2b6826 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98024 (opens in a new tab)
- git.kernel.org/stable/c/90f6f5cb331af52b14c0f309fb27dc243e8e2982 (opens in a new tab)