CVE-2024-43819: Linux kernel · kvm: s390: Reject memory region operations for ucontrol VMs
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:19 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 17 Aug 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 Oct 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to reject the problematic ioctls for ucontrol VMs. Users should update to a Linux kernel version that includes this fix. Memory management for ucontrol VMs should be performed using the recommended ioctls KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP as per the updated documentation.
Description
A vulnerability in the Linux kernel's KVM subsystem for s390 architecture was addressed by rejecting certain memory region operations on ucontrol virtual machines (VMs). Specifically, the ioctls KVM_SET_USER_MEMORY_REGION and KVM_SET_USER_MEMORY_REGION2 are now rejected for ucontrol VMs to prevent null pointer dereferences. Memory management for these VMs must be done in userspace using KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP ioctls. The fix also includes improved documentation for these operations.
References
- git.kernel.org/stable/c/8a1bbff443a5a22c466d11cbefca9cb361306a9b (opens in a new tab)
- git.kernel.org/stable/c/705a8b8cc5a44b206096abb1bfdc8bc43b3c75c7 (opens in a new tab)
- git.kernel.org/stable/c/49c9945c054df4c22008e2bf87ca74d3e2507aa6 (opens in a new tab)
- git.kernel.org/stable/c/7816e58967d0e6cadce05c8540b47ed027dc2499 (opens in a new tab)