CVE-2026-98399: Linux kernel · s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in aed56fa3108b7095e6a048e134981506c056a6cb : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in aed56fa3108b7095e6a048e134981506c056a6cb, 41647864e62b28388ecccc23a82f0e0a091f4ef2, 280ff19853440d59e031cd8fe161e81305721262 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 14 Oct 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
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A patch is available and has been applied in specific commits identified by their hashes. Users should update to a fixed version of the Linux kernel that includes these commits to remediate the issue. Since this is a kernel-level fix, applying the official kernel update is the recommended mitigation.
Description
A NULL pointer dereference vulnerability in the Linux kernel's s390/ipl component was fixed. The issue occurs when no re-IPL parameter block is provided during certain IPL types, causing an unconditional dereference of a NULL pointer. This leads the stand-alone dumper to enter a disabled wait state after completing the dump. The fix explicitly stores zero values for the IPL parameter block address and checksum when no re-IPL parameter block is available, preserving intended behavior for valid blocks.
References
- git.kernel.org/stable/c/41647864e62b28388ecccc23a82f0e0a091f4ef2 (opens in a new tab)
- git.kernel.org/stable/c/aed56fa3108b7095e6a048e134981506c056a6cb (opens in a new tab)
- git.kernel.org/stable/c/8d7988e8116c3d29d9e02ca9d37ee84577643f2d (opens in a new tab)
- git.kernel.org/stable/c/280ff19853440d59e031cd8fe161e81305721262 (opens in a new tab)
- git.kernel.org/stable/c/37f61b71cbc0caefc01022a19ee56fc2510e2e6e (opens in a new tab)