CVE-2026-98593: Linux kernel · s390/debug: Fix NULL pointer dereference in debug_info_copy()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c593f38e1cdb92f87d01be4c4e5ac12417b1454b : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in c593f38e1cdb92f87d01be4c4e5ac12417b1454b, a19bede30f0da5ae56782edac62b5998a7434cba, 33f706884821da9cb55b650b7b1d4f2bdf800137 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 18 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
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AI-suggested
A patch is available and has been applied in Linux kernel version 5.15 and later. Users should upgrade to the fixed kernel versions identified by the provided commit hashes to remediate this issue. Since this is a kernel-level vulnerability, applying the official kernel update is the recommended mitigation.
Description
A NULL pointer dereference vulnerability in the Linux kernel's s390/debug subsystem was fixed in version 5.15. The issue occurs when debug_register_static() fails and clears certain pointers but leaves area bounds unchanged, causing debug_info_copy() to dereference NULL pointers during copying operations. The fix involves skipping the copy loop when the source has no areas.
References
- git.kernel.org/stable/c/13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225 (opens in a new tab)
- git.kernel.org/stable/c/a19bede30f0da5ae56782edac62b5998a7434cba (opens in a new tab)
- git.kernel.org/stable/c/33f706884821da9cb55b650b7b1d4f2bdf800137 (opens in a new tab)
- git.kernel.org/stable/c/2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b (opens in a new tab)
- git.kernel.org/stable/c/9c6af88fbefbe77608b77409df23a1617e28398c (opens in a new tab)
- git.kernel.org/stable/c/c593f38e1cdb92f87d01be4c4e5ac12417b1454b (opens in a new tab)
- git.kernel.org/stable/c/012bfcd5a51082d5a65f096dfb9ca652b5267965 (opens in a new tab)