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CVE-2023-53756· NVD / CVE Program· CNA Linux

KVM: VMX: Fix crash due to uninitialized current_vmcs

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 3ba95cc671c025d0d2a1c7d5e2930f0ff0980cf4, 6baebcecf09acd19e2bab1c2911dcdba5d48a1dc, 6e7bc50f97c9855da83f1478f722590defd45ff2.

Low priority for now. Upgrade to Linux Linux 3ba95cc671c025d0d2a1c7d5e2930f0ff0980cf4, 6baebcecf09acd19e2bab1c2911dcdba5d48a1dc, 6e7bc50f97c9855da83f1478f722590defd45ff2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Fix crash due to uninitialized current_vmcs KVM enables 'Enlightened VMCS' and 'Enlightened MSR Bitmap' when running as a nested hypervisor on top of Hyper-V. When MSR bitmap is updated, evmcs_touch_msr_bitmap function uses current_vmcs per-cpu variable to mark that the msr bitmap was changed. vmx_vcpu_create() modifies the msr bitmap via vmx_disable_intercept_for_msr -> vmx_msr_bitmap_l01_changed which in the end calls this function. The function checks for current_vmcs if it is null but the check is insufficient because current_vmcs is not initialized. Because of this, the code might incorrectly write to the structure pointed by current_vmcs value left by another task. Preemption is not disabled, the current task can be preempted and moved to another CPU while current_vmcs is accessed multiple times from evmcs_touch_msr_bitmap() which leads to crash. The manipulation of MSR bitmaps by callers happens only for vmcs01 so the solution is to use vmx->vmcs01.vmcs instead of current_vmcs. BUG: kernel NULL pointer dereference, address: 0000000000000338 PGD 4e1775067 P4D 0 Oops: 0002 [#1] PREEMPT SMP NOPTI ... RIP: 0010:vmx_msr_bitmap_l01_changed+0x39/0x50 [kvm_intel] ... Call Trace: vmx_disable_intercept_for_msr+0x36/0x260 [kvm_intel] vmx_vcpu_create+0xe6/0x540 [kvm_intel] kvm_arch_vcpu_create+0x1d1/0x2e0 [kvm] kvm_vm_ioctl_create_vcpu+0x178/0x430 [kvm] kvm_vm_ioctl+0x53f/0x790 [kvm] __x64_sys_ioctl+0x8a/0xc0 do_syscall_64+0x5c/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd

—No exploit Fix available
Published
Dec 7, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.18affected
    • ceef7d10dfb6284d512c499292e6daa35ea83f90 and later · before 6baebcecf09acd19e2bab1c2911dcdba5d48a1dcaffected · git
    • ceef7d10dfb6284d512c499292e6daa35ea83f90 and later · before 6e7bc50f97c9855da83f1478f722590defd45ff2affected · git
    • ceef7d10dfb6284d512c499292e6daa35ea83f90 and later · before b2de2b4d4e007f9add46ea8dc06f781835e3ea9faffected · git
    • ceef7d10dfb6284d512c499292e6daa35ea83f90 and later · before 3ba95cc671c025d0d2a1c7d5e2930f0ff0980cf4affected · git
    • ceef7d10dfb6284d512c499292e6daa35ea83f90 and later · before 93827a0a36396f2fd6368a54a020f420c8916e9baffected · git
    • before 4.18not affected · semver
    • 5.10.175 and later · up to and including 5.10.*not affected · semver
    • 5.15.103 and later · up to and including 5.15.*not affected · semver
    • 6.1.16 and later · up to and including 6.1.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.20-16.1.20-1
Red Hat:rhel_eus:9.0::appstreambpftool-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debug-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debug-develbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-develbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-devel-matchedbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-docbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-tools-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-zfcpdump-develbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamperfbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreamperf-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::appstreampython3-perf-debuginfobefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::baseosbpftoolbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::baseoskernelbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::baseoskernel-abi-stablelistsbefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0
Red Hat:rhel_eus:9.0::baseoskernel-corebefore 0:5.14.0-70.58.1.el9_00:5.14.0-70.58.1.el9_0

+14

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53754Dec 7, 2025 · scsi: lpfc: Fix ioremap issues in lpfc_sli4_pci_mem_setup()
    0Monitor
  • ← EarlierCVE-2023-53755Dec 7, 2025 · dmaengine: ptdma: check for null desc before calling pt_cmd_callback
    0Monitor
  • Later →CVE-2023-53757Dec 7, 2025 · irqchip/irq-mvebu-gicp: Fix refcount leak in mvebu_gicp_probe
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3ba95cc671c025d0d2a1c7d5e2930f0ff0980cf4Vendor (CNA)
Linux Linux6baebcecf09acd19e2bab1c2911dcdba5d48a1dcVendor (CNA)
Linux Linux6e7bc50f97c9855da83f1478f722590defd45ff2Vendor (CNA)
Linux Linux93827a0a36396f2fd6368a54a020f420c8916e9bVendor (CNA)
Linux Linuxb2de2b4d4e007f9add46ea8dc06f781835e3ea9fVendor (CNA)
debian:linux6.1.20-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-s390x0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-devel0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-devel-matched0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)
red hat:kernel-doc0:5.14.0-70.58.1.el9_0 · Red Hat:rhel_eus:9.0::appstreamPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records