KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
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: 8383741ab
CVE-2025-22013
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-22013
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c4ab60a86c5ed7c0d727c6dc8cec352e16bc7f90",
"lessThan": "5289ac43b69c61a49c75720921f2008005a31c43",
"versionType": "git"
},
{
"status": "affected",
"version": "d5f7d3833b534f9e43e548461dba1e60aa82f587",
"lessThan": "04c50cc23a492c4d43fdaefc7c1ecc0ff6f7b82e",
"versionType": "git"
},
{
"status": "affected",
"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe",
"lessThan": "806d5c1e1d2e5502175a24bf70f251648d99c36a",
"versionType": "git"
},
{
"status": "affected",
"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe",
"lessThan": "79e140bba70bcacc5fe15bf8c0b958793fd7d56f",
"versionType": "git"
},
{
"status": "affected",
"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe",
"lessThan": "900b444be493b7f404898c785d6605b177a093d0",
"versionType": "git"
},
{
"status": "affected",
"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe",
"lessThan": "fbc7e61195e23f744814e78524b73b59faa54ab4",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/kernel/fpsimd.c",
"arch/arm64/kvm/fpsimd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.85",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.21",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.9",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/kernel/fpsimd.c",
"arch/arm64/kvm/fpsimd.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-22013
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30451 · Revision 1
- Added to Heist Feed
- Publisher date