CVE-2024-43819: kvm: s390: Reject memory region operations for ucontrol VMs
Vulnerability summary
CVE-2024-43819 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.2% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 16Timeline
- 17-08-2024PublishedVulnerability first disclosed.
- 30-10-2026Last modifiedVulnerability information updated.
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]
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.29%
Chance of exploitation in the next 30 days
Percentile
21%
Versus all other CVEs
30-day change
Increase +0.08 pp
From 0.21% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu99 products
- linux< 6.8.0-50.51
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1020.22
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 27e0393f15fc8bc855c6a888387ff5ffd2181089, < 8a1bbff443a5a22c466d11cbefca9cb361306a9b | ≥ 27e0393f15fc8bc855c6a888387ff5ffd2181089, < 705a8b8cc5a44b206096abb1bfdc8bc43b3c75c7 | ≥ 27e0393f15fc8bc855c6a888387ff5ffd2181089, < 49c9945c054df4c22008e2bf87ca74d3e2507aa6 | ≥ 27e0393f15fc8bc855c6a888387ff5ffd2181089, < 7816e58967d0e6cadce05c8540b47ed027dc2499 | 3.4
- linux_kernel≥ 3.4, < 6.10.3
Debian1 product
- linuxAll versions (No fix recorded) | < 6.10.3-1
3 vendors · 102 products
