{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-22013", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.806Z", "datePublished": "2025-04-08T08:18:04.000Z", "dateUpdated": "2025-04-09T14:52:07.429Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-04-09T14:52:07.429Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state\n\nThere are several problems with the way hyp code lazily saves the host's\nFPSIMD/SVE state, including:\n\n* Host SVE being discarded unexpectedly due to inconsistent\n configuration of TIF_SVE and CPACR_ELx.ZEN. This has been seen to\n result in QEMU crashes where SVE is used by memmove(), as reported by\n Eric Auger:\n\n https://issues.redhat.com/browse/RHEL-68997\n\n* Host SVE state is discarded *after* modification by ptrace, which was an\n unintentional ptrace ABI change introduced with lazy discarding of SVE state.\n\n* The host FPMR value can be discarded when running a non-protected VM,\n where FPMR support is not exposed to a VM, and that VM uses\n FPSIMD/SVE. In these cases the hyp code does not save the host's FPMR\n before unbinding the host's FPSIMD/SVE/SME state, leaving a stale\n value in memory.\n\nAvoid these by eagerly saving and \"flushing\" the host's FPSIMD/SVE/SME\nstate when loading a vCPU such that KVM does not need to save any of the\nhost's FPSIMD/SVE/SME state. For clarity, fpsimd_kvm_prepare() is\nremoved and the necessary call to fpsimd_save_and_flush_cpu_state() is\nplaced in kvm_arch_vcpu_load_fp(). As 'fpsimd_state' and 'fpmr_ptr'\nshould not be used, they are set to NULL; all uses of these will be\nremoved in subsequent patches.\n\nHistorical problems go back at least as far as v5.17, e.g. erroneous\nassumptions about TIF_SVE being clear in commit:\n\n 8383741ab2e773a9 (\"KVM: arm64: Get rid of host SVE tracking/saving\")\n\n... and so this eager save+flush probably needs to be backported to ALL\nstable trees."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kernel/fpsimd.c", "arch/arm64/kvm/fpsimd.c"], "versions": [{"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe", "lessThan": "806d5c1e1d2e5502175a24bf70f251648d99c36a", "status": "affected", "versionType": "git"}, {"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe", "lessThan": "79e140bba70bcacc5fe15bf8c0b958793fd7d56f", "status": "affected", "versionType": "git"}, {"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe", "lessThan": "900b444be493b7f404898c785d6605b177a093d0", "status": "affected", "versionType": "git"}, {"version": "93ae6b01bafee8fa385aa25ee7ebdb40057f6abe", "lessThan": "fbc7e61195e23f744814e78524b73b59faa54ab4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kernel/fpsimd.c", "arch/arm64/kvm/fpsimd.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.85", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.21", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.9", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/806d5c1e1d2e5502175a24bf70f251648d99c36a"}, {"url": "https://git.kernel.org/stable/c/79e140bba70bcacc5fe15bf8c0b958793fd7d56f"}, {"url": "https://git.kernel.org/stable/c/900b444be493b7f404898c785d6605b177a093d0"}, {"url": "https://git.kernel.org/stable/c/fbc7e61195e23f744814e78524b73b59faa54ab4"}], "title": "KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state", "x_generator": {"engine": "bippy-7c5fe7eed585"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state\n\nThere are several problems with the way hyp code lazily saves the host's\nFPSIMD/SVE state, including:\n\n* Host SVE being discarded unexpectedly due to inconsistent\n configuration of TIF_SVE and CPACR_ELx.ZEN. This has been seen to\n result in QEMU crashes where SVE is used by memmove(), as reported by\n Eric Auger:\n\n https://issues.redhat.com/browse/RHEL-68997\n\n* Host SVE state is discarded *after* modification by ptrace, which was an\n unintentional ptrace ABI change introduced with lazy discarding of SVE state.\n\n* The host FPMR value can be discarded when running a non-protected VM,\n where FPMR support is not exposed to a VM, and that VM uses\n FPSIMD/SVE. In these cases the hyp code does not save the host's FPMR\n before unbinding the host's FPSIMD/SVE/SME state, leaving a stale\n value in memory.\n\nAvoid these by eagerly saving and \"flushing\" the host's FPSIMD/SVE/SME\nstate when loading a vCPU such that KVM does not need to save any of the\nhost's FPSIMD/SVE/SME state. For clarity, fpsimd_kvm_prepare() is\nremoved and the necessary call to fpsimd_save_and_flush_cpu_state() is\nplaced in kvm_arch_vcpu_load_fp(). As 'fpsimd_state' and 'fpmr_ptr'\nshould not be used, they are set to NULL; all uses of these will be\nremoved in subsequent patches.\n\nHistorical problems go back at least as far as v5.17, e.g. erroneous\nassumptions about TIF_SVE being clear in commit:\n\n 8383741ab2e773a9 (\"KVM: arm64: Get rid of host SVE tracking/saving\")\n\n... and so this eager save+flush probably needs to be backported to ALL\nstable trees."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: Guardar y vaciar incondicionalmente el estado FPSIMD/SVE/SME del host Hay varios problemas con la forma en que el c\u00f3digo hyp guarda de forma diferida el estado FPSIMD/SVE del host, incluidos: * El SVE del host se descarta inesperadamente debido a una configuraci\u00f3n inconsistente de TIF_SVE y CPACR_ELx.ZEN. Se ha visto que esto da como resultado fallos de QEMU donde memmove() usa SVE, como lo inform\u00f3 Eric Auger: https://issues.redhat.com/browse/RHEL-68997 * El estado SVE del host se descarta *despu\u00e9s* de la modificaci\u00f3n por ptrace, que fue un cambio de ABI de ptrace no intencionado introducido con el descarte diferido del estado SVE. * El valor FPMR del host se puede descartar cuando se ejecuta una VM no protegida, donde la compatibilidad con FPMR no est\u00e1 expuesta a una VM y esa VM usa FPSIMD/SVE. En estos casos, el c\u00f3digo hyp no guarda el FPMR del host antes de desvincular su estado FPSIMD/SVE/SME, lo que deja un valor obsoleto en memoria. Para evitar esto, guarde y vac\u00ede el estado FPSIMD/SVE/SME del host al cargar una vCPU, de modo que KVM no tenga que guardar ninguno de sus estados. Para mayor claridad, se ha eliminado fpsimd_kvm_prepare() y la llamada necesaria a fpsimd_save_and_flush_cpu_state() se ha ubicado en kvm_arch_vcpu_load_fp(). Dado que 'fpsimd_state' y 'fpmr_ptr' no deben usarse, se establecen en NULL; todos sus usos se eliminar\u00e1n en parches posteriores. Los problemas hist\u00f3ricos se remontan al menos a la versi\u00f3n v5.17, por ejemplo, suposiciones err\u00f3neas acerca de que TIF_SVE est\u00e1 claro en el commit: 8383741ab2e773a9 (\"KVM: arm64: deshacerse del seguimiento/guardado de SVE del host\")... y por eso, este ansioso guardado y vaciado probablemente deba ser retrotra\u00eddo a TODOS los \u00e1rboles estables."}], "id": "CVE-2025-22013", "lastModified": "2025-04-08T18:13:53.347", "metrics": {}, "published": "2025-04-08T09:15:25.643", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/79e140bba70bcacc5fe15bf8c0b958793fd7d56f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/806d5c1e1d2e5502175a24bf70f251648d99c36a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/900b444be493b7f404898c785d6605b177a093d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fbc7e61195e23f744814e78524b73b59faa54ab4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state", "id": "2358222", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2358222"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state\nThere are several problems with the way hyp code lazily saves the host's\nFPSIMD/SVE state, including:\n* Host SVE being discarded unexpectedly due to inconsistent\nconfiguration of TIF_SVE and CPACR_ELx.ZEN. This has been seen to\nresult in QEMU crashes where SVE is used by memmove(), as reported by\nEric Auger:\nhttps://issues.redhat.com/browse/RHEL-68997\n* Host SVE state is discarded *after* modification by ptrace, which was an\nunintentional ptrace ABI change introduced with lazy discarding of SVE state.\n* The host FPMR value can be discarded when running a non-protected VM,\nwhere FPMR support is not exposed to a VM, and that VM uses\nFPSIMD/SVE. In these cases the hyp code does not save the host's FPMR\nbefore unbinding the host's FPSIMD/SVE/SME state, leaving a stale\nvalue in memory.\nAvoid these by eagerly saving and \"flushing\" the host's FPSIMD/SVE/SME\nstate when loading a vCPU such that KVM does not need to save any of the\nhost's FPSIMD/SVE/SME state. For clarity, fpsimd_kvm_prepare() is\nremoved and the necessary call to fpsimd_save_and_flush_cpu_state() is\nplaced in kvm_arch_vcpu_load_fp(). As 'fpsimd_state' and 'fpmr_ptr'\nshould not be used, they are set to NULL; all uses of these will be\nremoved in subsequent patches.\nHistorical problems go back at least as far as v5.17, e.g. erroneous\nassumptions about TIF_SVE being clear in commit:\n8383741ab2e773a9 (\"KVM: arm64: Get rid of host SVE tracking/saving\")\n... and so this eager save+flush probably needs to be backported to ALL\nstable trees."], "name": "CVE-2025-22013", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-22013\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22013\nhttps://lore.kernel.org/linux-cve-announce/2025040843-CVE-2025-22013-c885@gregkh/T"], "threat_severity": "Moderate"}