CVE-2026-43315: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-fmhq-qfjw-fm2x
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CVSS 5.5
Published
Advisory Summary

CVE-2026-43315 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43315 at a Glance

CVE Identifier CVE-2026-43315
GHSA Identifier GHSA-fmhq-qfjw-fm2x
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-43315

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-43315, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding Drop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing as it is trivially easy to trigger from userspace by modifying CPUID after loading CR3. E.g. modifying the state restoration selftest like so: --- tools/testing/selftests/kvm/x86/state_test.c +++ tools/testing/selftests/kvm/x86/state_test.c @@ -280,7 +280,16 @@ int main(int argc, char *argv[]) /* Restore state in a new VM. */ vcpu = vm_recreate_with_one_vcpu(vm); - vcpu_load_state(vcpu, state); + + if (stage == 4) { + state->sregs.cr3 = BIT(44); + vcpu_load_state(vcpu, state); + + vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36); + __vcpu_nested_state_set(vcpu, &state->nested); + } else { + vcpu_load_state(vcpu, state); + } /* * Restore XSAVE state in a dummy vCPU, first without doing generates: WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd] Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm] CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G W 6.18.0-rc7-58e10b63777d-next-vm Tainted: [W]=WARN Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd] Call Trace: <TASK> kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm] kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm] __x64_sys_ioctl+0x8f/0xd0 do_syscall_64+0x61/0xad0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Simply delete the WARN instead of trying to prevent userspace from shoving "illegal" state into CR3. For better or worse, KVM's ABI allows userspace to set CPUID after SREGS, and vice versa, and KVM is very permissive when it comes to guest CPUID. I.e. attempting to enforce the virtual CPU model when setting CPUID could break userspace. Given that the WARN doesn't provide any meaningful protection for KVM or benefit for userspace, simply drop it even though the odds of breaking userspace are minuscule. Opportunistically delete a spurious newline.

References

NVD — CVE-2026-43315 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43315
git.kernel.org/stable/c/155ec243ef... WEB
https://git.kernel.org/stable/c/155ec243ef726f4bc49536fa0bfb565dc011ab17
git.kernel.org/stable/c/580ea57840... WEB
https://git.kernel.org/stable/c/580ea57840864d40e019bc13fd26afdc8d510a2f
git.kernel.org/stable/c/969e5e13ff... WEB
https://git.kernel.org/stable/c/969e5e13ff5c18603f21d1f9f64ec9194e141ac0
git.kernel.org/stable/c/ce904c8a5b... WEB
https://git.kernel.org/stable/c/ce904c8a5bbe697eae0f7e34b07095bd7a6dee19
git.kernel.org/stable/c/deb8f6dfd3... WEB
https://git.kernel.org/stable/c/deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b
git.kernel.org/stable/c/ebb2ab4f1c... WEB
https://git.kernel.org/stable/c/ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8
git.kernel.org/stable/c/fc3ba56385... WEB
https://git.kernel.org/stable/c/fc3ba56385d03501eb582e4b86691ba378e556f9

Frequently Asked Questions

What is CVE-2026-43315?
CVE-2026-43315 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43315?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43315?
CVE-2026-43315 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-43315?
CVE-2026-43315 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-43315?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fmhq-qfjw-fm2x",
  "modified" : "2026-05-15T18:30:30Z",
  "published" : "2026-05-08T15:31:23Z",
  "aliases" : [ "CVE-2026-43315" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding\n\nDrop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing\nas it is trivially easy to trigger from userspace by modifying CPUID after\nloading CR3.  E.g. modifying the state restoration selftest like so:\n\n  --- tools/testing/selftests/kvm/x86/state_test.c\n  +++ tools/testing/selftests/kvm/x86/state_test.c\n  @@ -280,7 +280,16 @@ int main(int argc, char *argv[])\n\n                 /* Restore state in a new VM.  */\n                  vcpu = vm_recreate_with_one_vcpu(vm);\n  -               vcpu_load_state(vcpu, state);\n  +\n  +               if (stage == 4) {\n  +                       state->sregs.cr3 = BIT(44);\n  +                       vcpu_load_state(vcpu, state);\n  +\n  +                       vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36);\n  +                       __vcpu_nested_state_set(vcpu, &state->nested);\n  +               } else {\n  +                       vcpu_load_state(vcpu, state);\n  +               }\n\n                  /*\n                   * Restore XSAVE state in a dummy vCPU, first without doing\n\ngenerates:\n\n  WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd]\n  Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm]\n  CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G        W           6.18.0-rc7-58e10b63777d-next-vm\n  Tainted: [W]=WARN\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd]\n  Call Trace:\n   <TASK>\n   kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm]\n   kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm]\n   __x64_sys_ioctl+0x8f/0xd0\n   do_syscall_64+0x61/0xad0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nSimply delete the WARN instead of trying to prevent userspace from shoving\n\"illegal\" state into CR3.  For better or worse, KVM's ABI allows userspace\nto set CPUID after SREGS, and vice versa, and KVM is very permissive when\nit comes to guest CPUID.  I.e. attempting to enforce the virtual CPU model\nwhen setting CPUID could break userspace.  Given that the WARN doesn't\nprovide any meaningful protection for KVM or benefit for userspace, simply\ndrop it even though the odds of breaking userspace are minuscule.\n\nOpportunistically delete a spurious newline.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43315"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/155ec243ef726f4bc49536fa0bfb565dc011ab17"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/580ea57840864d40e019bc13fd26afdc8d510a2f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/969e5e13ff5c18603f21d1f9f64ec9194e141ac0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ce904c8a5bbe697eae0f7e34b07095bd7a6dee19"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fc3ba56385d03501eb582e4b86691ba378e556f9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-08T14:16:39Z"
  }
}