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CVE-2025-22013— KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state

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，该漏洞源于未正确保存主机FPSIMD/SVE/SME状态，可能导致QEMU崩溃或ptrace ABI变更。

CVSS 7.3 · High EPSS 0.21% · P11

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux c4ab60a86c5ed7c0d727c6dc8cec352e16bc7f90< 5289ac43b69c61a49c75720921f2008005a31c43 affected
d5f7d3833b534f9e43e548461dba1e60aa82f587< 04c50cc23a492c4d43fdaefc7c1ecc0ff6f7b82e affected
93ae6b01bafee8fa385aa25ee7ebdb40057f6abe< 806d5c1e1d2e5502175a24bf70f251648d99c36a affected
93ae6b01bafee8fa385aa25ee7ebdb40057f6abe< 79e140bba70bcacc5fe15bf8c0b958793fd7d56f affected
93ae6b01bafee8fa385aa25ee7ebdb40057f6abe< 900b444be493b7f404898c785d6605b177a093d0 affected
93ae6b01bafee8fa385aa25ee7ebdb40057f6abe< fbc7e61195e23f744814e78524b73b59faa54ab4 affected
6.2 affected
< 6.2 unaffected
… +4 more rows
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I. Basic Information for CVE-2025-22013

Vulnerability Information
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Vulnerability Title
KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state There are several problems with the way hyp code lazily saves the host's FPSIMD/SVE state, including: * Host SVE being discarded unexpectedly due to inconsistent configuration of TIF_SVE and CPACR_ELx.ZEN. This has been seen to result in QEMU crashes where SVE is used by memmove(), as reported by Eric Auger: https://issues.redhat.com/browse/RHEL-68997 * Host SVE state is discarded *after* modification by ptrace, which was an unintentional ptrace ABI change introduced with lazy discarding of SVE state. * The host FPMR value can be discarded when running a non-protected VM, where FPMR support is not exposed to a VM, and that VM uses FPSIMD/SVE. In these cases the hyp code does not save the host's FPMR before unbinding the host's FPSIMD/SVE/SME state, leaving a stale value in memory. Avoid these by eagerly saving and "flushing" the host's FPSIMD/SVE/SME state when loading a vCPU such that KVM does not need to save any of the host's FPSIMD/SVE/SME state. For clarity, fpsimd_kvm_prepare() is removed and the necessary call to fpsimd_save_and_flush_cpu_state() is placed in kvm_arch_vcpu_load_fp(). As 'fpsimd_state' and 'fpmr_ptr' should not be used, they are set to NULL; all uses of these will be removed in subsequent patches. Historical problems go back at least as far as v5.17, e.g. erroneous assumptions about TIF_SVE being clear in commit: 8383741ab2e773a9 ("KVM: arm64: Get rid of host SVE tracking/saving") ... and so this eager save+flush probably needs to be backported to ALL stable trees.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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，该漏洞源于未正确保存主机FPSIMD/SVE/SME状态，可能导致QEMU崩溃或ptrace ABI变更。
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 c4ab60a86c5ed7c0d727c6dc8cec352e16bc7f90 ~ 5289ac43b69c61a49c75720921f2008005a31c43 -
Linux Linux 6.2 -

II. Public POCs for CVE-2025-22013

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III. Intelligence Information for CVE-2025-22013

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Patches & Fixes for CVE-2025-22013 (3)

Same Patch Batch · Linux · 2025-04-08 · 10 CVEs total

CVE-2025-22012 8.8 HIGH Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu"
CVE-2025-22015 7.8 HIGH mm/migrate: fix shmem xarray update during migration
CVE-2025-22017 devlink: fix xa_alloc_cyclic() error handling
CVE-2025-22016 dpll: fix xa_alloc_cyclic() error handling
CVE-2025-22014 soc: qcom: pdr: Fix the potential deadlock
CVE-2025-22011 ARM: dts: bcm2711: Fix xHCI power-domain
CVE-2025-22010 RDMA/hns: Fix soft lockup during bt pages loop
CVE-2025-22009 regulator: dummy: force synchronous probing
CVE-2025-22008 regulator: check that dummy regulator has been probed before using it

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux