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CVE-2022-49559— KVM: x86: Drop WARNs that assert a triple fault never "escapes" from L2

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确处理L2的三重故障，可能导致L1受到影响。

AI Predicted 5.3 Difficulty: Easy EPSS 0.30% · P21 Updated May 13, 2026

Possible ATT&CK Techniques 2 AI

T1498 · Network Denial of Service T1059 · Command and Scripting Interpreter

Affected Version Matrix 10

Vendor	Product	Version Range	Status
Linux	Linux	`cb6a32c2b8777ad31a02e585584d869251a790e3< 8d3a2aa0976f57320ba89baf9d57fb158dd0cd0d`	affected
		`cb6a32c2b8777ad31a02e585584d869251a790e3< f476a59d5c86c02a79eef893c6da86735f2977ac`	affected
		`cb6a32c2b8777ad31a02e585584d869251a790e3< 7de373c9b48229e428ecdb8fbde269c5a8617fd2`	affected
		`cb6a32c2b8777ad31a02e585584d869251a790e3< 45846661d10422ce9e22da21f8277540b29eca22`	affected
		`5.13`	affected
		`< 5.13`	unaffected
		`5.15.45≤ 5.15.*`	unaffected
		`5.17.13≤ 5.17.*`	unaffected
… +2 more rows

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I. Basic Information for CVE-2022-49559

Vulnerability Information

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Vulnerability Title

KVM: x86: Drop WARNs that assert a triple fault never "escapes" from L2

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Drop WARNs that assert a triple fault never "escapes" from L2 Remove WARNs that sanity check that KVM never lets a triple fault for L2 escape and incorrectly end up in L1. In normal operation, the sanity check is perfectly valid, but it incorrectly assumes that it's impossible for userspace to induce KVM_REQ_TRIPLE_FAULT without bouncing through KVM_RUN (which guarantees kvm_check_nested_state() will see and handle the triple fault). The WARN can currently be triggered if userspace injects a machine check while L2 is active and CR4.MCE=0. And a future fix to allow save/restore of KVM_REQ_TRIPLE_FAULT, e.g. so that a synthesized triple fault isn't lost on migration, will make it trivially easy for userspace to trigger the WARN. Clearing KVM_REQ_TRIPLE_FAULT when forcibly leaving guest mode is tempting, but wrong, especially if/when the request is saved/restored, e.g. if userspace restores events (including a triple fault) and then restores nested state (which may forcibly leave guest mode). Ignoring the fact that KVM doesn't currently provide the necessary APIs, it's userspace's responsibility to manage pending events during save/restore. ------------[ cut here ]------------ WARNING: CPU: 7 PID: 1399 at arch/x86/kvm/vmx/nested.c:4522 nested_vmx_vmexit+0x7fe/0xd90 [kvm_intel] Modules linked in: kvm_intel kvm irqbypass CPU: 7 PID: 1399 Comm: state_test Not tainted 5.17.0-rc3+ #808 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:nested_vmx_vmexit+0x7fe/0xd90 [kvm_intel] Call Trace: <TASK> vmx_leave_nested+0x30/0x40 [kvm_intel] vmx_set_nested_state+0xca/0x3e0 [kvm_intel] kvm_arch_vcpu_ioctl+0xf49/0x13e0 [kvm] kvm_vcpu_ioctl+0x4b9/0x660 [kvm] __x64_sys_ioctl+0x83/0xb0 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae </TASK> ---[ end trace 0000000000000000 ]---

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Linux kernel 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确处理L2的三重故障，可能导致L1受到影响。

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	cb6a32c2b8777ad31a02e585584d869251a790e3 ~ 8d3a2aa0976f57320ba89baf9d57fb158dd0cd0d	-
Linux	Linux	5.13	-

II. Public POCs for CVE-2022-49559

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2022-49559

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Patches & Fixes for CVE-2022-49559 (4)

https://www.cve.org/CVERecord?id=CVE-2022-49559

Same Patch Batch · Linux · 2025-02-26 · 706 CVEs total

CVE-2022-49149	9.8 CRITICAL	rxrpc: Fix call timer start racing with call destruction
CVE-2022-49201	9.8 CRITICAL	ibmvnic: fix race between xmit and reset
CVE-2022-49194	9.8 CRITICAL	net: bcmgenet: Use stronger register read/writes to assure ordering
CVE-2022-49093	9.8 CRITICAL	skbuff: fix coalescing for page_pool fragment recycling
CVE-2022-49094	9.8 CRITICAL	net/tls: fix slab-out-of-bounds bug in decrypt_internal
CVE-2022-49407	9.8 CRITICAL	dlm: fix plock invalid read
CVE-2022-49362	9.8 CRITICAL	NFSD: Fix potential use-after-free in nfsd_file_put()
CVE-2022-49260	9.8 CRITICAL	crypto: hisilicon/sec - fix the aead software fallback for engine
CVE-2022-49418	9.8 CRITICAL	NFSv4: Fix free of uninitialized nfs4_label on referral lookup.
CVE-2022-49280	9.8 CRITICAL	NFSD: prevent underflow in nfssvc_decode_writeargs()
CVE-2022-49356	9.8 CRITICAL	SUNRPC: Trap RDMA segment overflows
CVE-2022-49561	9.8 CRITICAL	netfilter: conntrack: re-fetch conntrack after insertion
CVE-2022-49058	9.1 CRITICAL	cifs: potential buffer overflow in handling symlinks
CVE-2022-49470	8.8 HIGH	Bluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event
CVE-2022-49479	8.8 HIGH	mt76: fix tx status related use-after-free race on station removal
CVE-2022-49535	8.8 HIGH	scsi: lpfc: Fix null pointer dereference after failing to issue FLOGI and PLOGI
CVE-2022-49328	8.8 HIGH	mt76: fix use-after-free by removing a non-RCU wcid pointer
CVE-2022-49519	8.8 HIGH	ath10k: skip ath10k_halt during suspend for driver state RESTARTING
CVE-2022-49500	8.8 HIGH	wl1251: dynamically allocate memory used for DMA
CVE-2022-49114	8.8 HIGH	scsi: libfc: Fix use after free in fc_exch_abts_resp()

Showing top 20 of 706 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux