CVE-2026-98476: Linux kernel · s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in dbf30e661ceb9a52c94c85719716391dcc29142a : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 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 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in dbf30e661ceb9a52c94c85719716391dcc29142a, c3bbcb32deecc06ebb1762398399b566d5ff2fc9, 44b16b02608058fc72198ac0205969f0f43065df +5
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 multiple commits identified by their hashes. Users should update their Linux kernel to a fixed version that includes these patches. Since this is a kernel-level issue, applying the official fix is the recommended mitigation.
Description
A NULL pointer dereference vulnerability was identified and fixed in the Linux kernel's s390/cio subsystem in version 4.18. The issue occurs when the channel path registry entry for a CHPID is removed while the subchannel's PMCW still references that CHPID, causing a function to return NULL and leading to a NULL pointer dereference. The fix adds a missing NULL check before dereferencing the pointer.
References
- git.kernel.org/stable/c/9d8b21820caed9128945fffcedf03e2a4c21eee2 (opens in a new tab)
- git.kernel.org/stable/c/5fc54e04dad90b15d0430118b3f288a1d64e66c9 (opens in a new tab)
- git.kernel.org/stable/c/27e396a89f76f742abdbe9f8c4a58a6e806fdf59 (opens in a new tab)
- git.kernel.org/stable/c/dbf30e661ceb9a52c94c85719716391dcc29142a (opens in a new tab)
- git.kernel.org/stable/c/5e006ac90a4d331db1dd712b91fec849b45ffc01 (opens in a new tab)
- git.kernel.org/stable/c/c3bbcb32deecc06ebb1762398399b566d5ff2fc9 (opens in a new tab)
- git.kernel.org/stable/c/44b16b02608058fc72198ac0205969f0f43065df (opens in a new tab)
- git.kernel.org/stable/c/5b76268dac968612f7283d59b539036de955b7d9 (opens in a new tab)