TI-2022-26177 Aliases CVE-2022-50720 GHSA-pc73-7j79-5x2x

x86/apic: Don't disable x2APIC if locked

LOW 22Published 2025-12-24 · Updated 2026-05-11

Key facts

Attack vector: —
Privileges required: —
User interaction: —
Attack complexity: —
Impact type: —
Confidentiality · integrity · availability: —
Fix status: Partial Red Hat: 8 fixed, 4 without a fix

No CVSS vector from any source. Fix status from CNA and Red Hat.

Summary

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

Why it matters now

EPSS 0.00242 15th percentileScored 2026-11-07

Fix Partial Linux (Linux): 5.19.17, 6.0.3, 6.1Red Hat: 2 advisoriesRed Hat: 8 fixed, 4 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	3.3 and later	5.19.17, 6.0.3, 6.1	Patch available	CNA

Linux VendorLinux Affected 3.3 and later Fixed in 5.19.17, 6.0.3, 6.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	—	—	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 5.19.17, 6.0.3, 6.1

Red Hat 2 advisories

RHSA-2024:9315 Released 2024-11-12 · Red Hat rating Moderate
kernel security update
- Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers-5.14.0-503.11.1.el9_5, kernel-tools-libs-devel-5.14.0-503.11.1.el9_5, libperf-5.14.0-503.11.1.el9_5
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-503.11.1.el9_5, kernel-64k-debug-devel-matched-5.14.0-503.11.1.el9_5, kernel-64k-devel-5.14.0-503.11.1.el9_5 +12
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.4.0-503.11.1.el9_5, kernel-5.14.0-503.11.1.el9_5, kernel-64k-5.14.0-503.11.1.el9_5 +30
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +9
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +11
RHSA-2024:8613 Released 2024-10-30 · Red Hat rating Moderate
kernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-tools-libs-devel-5.14.0-284.90.1.el9_2
- Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-64k-debug-devel-5.14.0-284.90.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.90.1.el9_2, kernel-64k-devel-5.14.0-284.90.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool-7.0.0-284.90.1.el9_2, kernel-5.14.0-284.90.1.el9_2, kernel-64k-5.14.0-284.90.1.el9_2 +29

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat CodeReady Linux Builder (v. 9)	Fixed	RHSA-2024:9315
Red Hat CodeReady Linux Builder EUS (v.9.2)	Fixed	RHSA-2024:8613
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2024:9315
Red Hat Enterprise Linux AppStream EUS (v.9.2)	Fixed	RHSA-2024:8613
Red Hat Enterprise Linux BaseOS (v. 9)	Fixed	RHSA-2024:9315
Red Hat Enterprise Linux BaseOS EUS (v.9.2)	Fixed	RHSA-2024:8613
Red Hat Enterprise Linux Real Time (v. 9)	Fixed	RHSA-2024:9315
Red Hat Enterprise Linux Real Time for NFV (v. 9)	Fixed	RHSA-2024:9315

Not affected: 3 products

Red Hat CodeReady Linux Builder (v. 9)
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux AppStream (v. 9)

Timeline

2026-10-02 Threatist record created from CVE-2022-50720
2026-10-03 Alias added: GHSA-pc73-7j79-5x2x

References

Other 3

TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4

See all 21741 →

Sources

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