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CVE-2026-98928— KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2

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.

在 Linux 内核中，以下漏洞已得到修复： KVM: arm64：从 EL2 的 SVE 功能位推导 GUEST_HAS_SVE 标志 pkvm_init_features_from_host() 函数分别从主机获取 KVM_ARCH_FLAG_GUEST_HAS_SVE 标志和 KVM_ARM_VCPU_SVE 位，但 pkvm_vcpu_init_sve() 在测试该位，而 vcpu_has_sve() 却读取该标志。若主机仅设置了标志而未设置对应的位，则会导致生成的 vCPU 其 sve_state 为 N

AI Predicted 7.8 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 41d6028e28bd474298ff10409c292ec46cf43a90< 4efda204087145d40a84344edec7e9d3885ad3ab affected
41d6028e28bd474298ff10409c292ec46cf43a90< 7b5e99d286747b6b5b583b8efcd06bdbdd94b229 affected
41d6028e28bd474298ff10409c292ec46cf43a90< 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5 affected
6.14 affected
< 6.14 unaffected
6.18.55≤ 6.18.* unaffected
7.2.9≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-98928

Vulnerability Information
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Vulnerability Title
KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2 pkvm_init_features_from_host() takes KVM_ARCH_FLAG_GUEST_HAS_SVE and KVM_ARM_VCPU_SVE from the host separately, but pkvm_vcpu_init_sve() tests the bit while vcpu_has_sve() reads the flag. A host that sets the flag without the bit gets a vCPU with a NULL sve_state that the world switch loads the guest's SVE state from. Derive the flag from the bit, and drop the protected path's copy of the host's flag, which is dead code since protected VMs are not allowed SVE.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 41d6028e28bd474298ff10409c292ec46cf43a90 ~ 4efda204087145d40a84344edec7e9d3885ad3ab -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-98928

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III. Intelligence Information for CVE-2026-98928

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Patches & Fixes for CVE-2026-98928 (2)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98938 rust: irq: pass RegistrationInner as cookie to request_irq
CVE-2026-98951 riscv: ptrace: Zero-initialize regset buffers before copyin
CVE-2026-98950 flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()
CVE-2026-98949 drm/imagination: Fix reference and vm_bo handling in remap()
CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
CVE-2026-98947 vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
CVE-2026-98946 drm/vc4: Disable the V3D interrupt across runtime suspend
CVE-2026-98945 HID: steam: Rearrange teardown sequence
CVE-2026-98944 HID: steam: Refactor registration
CVE-2026-98943 HID: steam: Clean up locking
CVE-2026-98942 sched_ext: Build the cid tables privately and publish them with RCU
CVE-2026-98941 ext4: don't enable large folios on encrypted inodes
CVE-2026-98940 ASoC: qcom: lpass-cpu: use DAI table index for playback constraints
CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing
CVE-2026-98926 drm/amd/display: Remove sink usage from DPMS
CVE-2026-98930 KVM: s390: Fix IRQ injection with SIGP Stop and Store Status
CVE-2026-98929 macsec: initialize SecY before registering the netdevice
CVE-2026-98927 KVM: arm64: nv: Fix life cycle of the nested_mmus array
CVE-2026-98931 mtd: spinand: fix NULL pointer dereference with no ECC engine
CVE-2026-98925 bpf, sockmap: Fix self-redirect copied_seq double-counting

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98928

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