What’s Vulnerable › Vulnerabilities

CVE-2024-43819: kvm: s390: Reject memory region operations for ucontrol VMs

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-17 · updated 2026-10-30
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: kvm: s390: Reject memory region operations for ucontrol VMs This change rejects the KVM_SET_USER_MEMORY_REGION and KVM_SET_USER_MEMORY_REGION2 ioctls when called on a ucontrol VM. This is necessary since ucontrol VMs have kvm->arch.gmap set to 0 and would thus result in a null pointer dereference further in. Memory management needs to be performed in userspace and using the ioctls KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP. Also improve s390 specific documentation for KVM_SET_USER_MEMORY_REGION and KVM_SET_USER_MEMORY_REGION2. [frankja@linux.ibm.com: commit message spelling fix, subject prefix fix]

Affected products

• Linux kernel: from 3.4 before 6.10.3 — fixed in 6.10.3
• Linux: 3.4 — fixed in 6.11

How to fix

Upgrade to a fixed version: Linux kernel 6.10.3; Linux 6.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/49c9945c054df4c22008e2bf87ca74d3e2507aa6
• https://git.kernel.org/stable/c/705a8b8cc5a44b206096abb1bfdc8bc43b3c75c7
• https://git.kernel.org/stable/c/7816e58967d0e6cadce05c8540b47ed027dc2499
• https://git.kernel.org/stable/c/8a1bbff443a5a22c466d11cbefca9cb361306a9b

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