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CVE-2026-64555— KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()

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基金会开源的一款操作系统内核。 Linux kernel 6.7版本存在安全漏洞，该漏洞源于嵌套虚拟化场景下kvm_hyp_handle_mops()函数对SPSR_EL2恢复处理不当，缺少对vcpu_cpsr()合成值的翻译，可能导致系统状态异常。

CVSS 8.8 · High EPSS 0.13% · P2

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 2de451a329cf662beeba71f63c7f83ee24ca6642< 10a568010e827108d149779908850afaec898846 affected
2de451a329cf662beeba71f63c7f83ee24ca6642< 884b44256041ec6b2dcbe8e6a67384d26145cba1 affected
2de451a329cf662beeba71f63c7f83ee24ca6642< dd3b237eb7780d65eae296d3d3a70012b6e7a02f affected
2de451a329cf662beeba71f63c7f83ee24ca6642< ff1022c3de46753eb7eba2f6efd990569e66ff95 affected
6.7 affected
< 6.7 unaffected
6.12.97≤ 6.12.* unaffected
6.18.40≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-64555

Vulnerability Information
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Vulnerability Title
KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() kvm_hyp_handle_mops() resets the single-step state machine as part of rewinding state for a MOPS exception by modifying vcpu_cpsr() and writing the result directly into hardware. In the case of nested virtualization, vcpu_cpsr() is a synthetic value such that the rest of KVM can deal with vEL2 cleanly. That means the value requires translation before being written into hardware, which is unfortunately missing from the MOPS handler. Fix it by directly modifying SPSR_EL2 and avoiding the synthetic state altogether, which will be resynchronized on the next 'full' exit back to KVM.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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基金会开源的一款操作系统内核。 Linux kernel 6.7版本存在安全漏洞，该漏洞源于嵌套虚拟化场景下kvm_hyp_handle_mops()函数对SPSR_EL2恢复处理不当，缺少对vcpu_cpsr()合成值的翻译，可能导致系统状态异常。
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 2de451a329cf662beeba71f63c7f83ee24ca6642 ~ 10a568010e827108d149779908850afaec898846 -
Linux Linux 6.7 -

II. Public POCs for CVE-2026-64555

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III. Intelligence Information for CVE-2026-64555

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Patches & Fixes for CVE-2026-64555 (4)

Same Patch Batch · Linux · 2026-07-27 · 26 CVEs total

CVE-2026-64534 9.8 CRITICAL nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64535 9.8 CRITICAL nvmet-tcp: Fix potential UAF when ddgst mismatch
CVE-2026-64541 9.8 CRITICAL net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
CVE-2026-64551 9.1 CRITICAL sctp: validate STALE_COOKIE cause length before reading staleness
CVE-2026-64554 8.8 HIGH netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
CVE-2026-64552 8.4 HIGH virtio-net: fix len check in receive_big()
CVE-2026-64548 8.4 HIGH bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
CVE-2026-64536 8.1 HIGH staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop
CVE-2026-64547 8.1 HIGH net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
CVE-2026-64540 8.1 HIGH usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
CVE-2026-64532 7.8 HIGH fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
CVE-2026-64543 7.8 HIGH tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
CVE-2026-64539 7.8 HIGH Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
CVE-2026-17523 7.8 HIGH can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
CVE-2026-64533 7.8 HIGH fs/ntfs3: validate lcns_follow in log_replay conversion
CVE-2026-64531 7.8 HIGH net: openvswitch: reject oversized nested action attrs
CVE-2026-64545 7.5 HIGH net, bpf: check master for NULL in xdp_master_redirect()
CVE-2026-64550 7.3 HIGH net: qualcomm: rmnet: validate MAP frame length before ingress parsing
CVE-2026-64546 7.1 HIGH drm/edid: fix OOB read in drm_parse_tiled_block()
CVE-2026-64542 ipv6: ndisc: fix NULL deref in accept_untracked_na()

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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