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CVE-2022-50720· NVD / CVE Program· CNA Linux

x86/apic: Don't disable x2APIC if locked

In the Linux kernel, the following vulnerability has been resolved: x86/apic: Don't disable x2APIC if locked The APIC supports two modes, legacy APIC (or xAPIC), and Extended APIC (or x2APIC). X2APIC mode is mostly compatible with legacy APIC, but it disables the memory-mapped APIC interface in favor of one that uses MSRs. The APIC mode is controlled by the EXT bit in the APIC MSR. The MMIO/xAPIC interface has some problems, most notably the APIC LEAK [1]. This bug allows an attacker to use the APIC MMIO interface to extract data from the SGX enclave. Introduce support for a new feature that will allow the BIOS to lock the APIC in x2APIC mode. If the APIC is locked in x2APIC mode and the kernel tries to disable the APIC or revert to legacy APIC mode a GP fault will occur. Introduce support for a new MSR (IA32_XAPIC_DISABLE_STATUS) and handle the new locked mode when the LEGACY_XAPIC_DISABLED bit is set by preventing the kernel from trying to disable the x2APIC. On platforms with the IA32_XAPIC_DISABLE_STATUS MSR, if SGX or TDX are enabled the LEGACY_XAPIC_DISABLED will be set by the BIOS. If legacy APIC is required, then it SGX and TDX need to be disabled in the BIOS. [1]: https://aepicleak.com/aepicleak.pdf

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 14th percentile
CWE
—
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Action score

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Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Noroxi analysis

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Affected systems

—

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

    • 3.3affected
    • fb209bd891645bb87b9618b724f0b4928e0df3de and later · before 05785ba834f23272f9d23427ae4a80ac505a5296affected · git
    • fb209bd891645bb87b9618b724f0b4928e0df3de and later · before dd1241e00addbf0b95f6cd6ce32152692820657eaffected · git
    • fb209bd891645bb87b9618b724f0b4928e0df3de and later · before b8d1d163604bd1e600b062fb00de5dc42baa355faffected · git
    • before 3.3not affected · semver
    • 5.19.17 and later · up to and including 5.19.*not affected · semver
    • 6.0.3 and later · up to and including 6.0.*not affected · semver
    • 6.1 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.3-16.0.3-1
Red Hat:rhel_eus:9.2::appstreambpftool-debuginfobefore 0:7.0.0-284.90.1.el9_20:7.0.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-debug-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-debug-develbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-debug-devel-matchedbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-develbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-64k-devel-matchedbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debug-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debug-develbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-develbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-devel-matchedbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-docbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-tools-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-zfcpdump-develbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2
Red Hat:rhel_eus:9.2::appstreamperfbefore 0:5.14.0-284.90.1.el9_20:5.14.0-284.90.1.el9_2

+36

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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 Linux05785ba834f23272f9d23427ae4a80ac505a5296Vendor (CNA)
Linux Linuxb8d1d163604bd1e600b062fb00de5dc42baa355fVendor (CNA)
Linux Linuxdd1241e00addbf0b95f6cd6ce32152692820657eVendor (CNA)
debian:linux6.0.3-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-284.90.1.el9_2 · Red Hat:rhel_eus:9.2::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.

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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✗ → ✓

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References

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

All records