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CVE-2026-98713— KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT

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：在不依赖 FEAT_FGT 的情况下应用细粒度的 UNDEF 异常 细粒度未定义指令（FGUs）实际上并不需要硬件支持，因此不应将 FGT 陷阱配置的插入操作限制在必须存在 FEAT_FGT 的条件下。这是允许始终启用 FGUs 所需的唯一操作，因为 函数无论是否具备 FEAT_FGT 特性，都会计算 FGU 相关位。 此外，该修复还解决了一个误报的警告（spurious WARN）：当在非 FEAT_FGT 硬件上，于 vEL1 环境中对缺少 F

EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1069.006

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f< 2f4a15c52a552c5244ec27f4ca8bda855594f918 affected
f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f< 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087 affected
f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f< af3300b3a6bace925a496f3520e171c07b999c72 affected
f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f< 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07 affected
6.9 affected
< 6.9 unaffected
6.12.113≤ 6.12.* unaffected
6.18.56≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98713

Vulnerability Information
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Vulnerability Title
KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT FGUs don't actually require hardware support, so don't gate fgt trap config insertion on FGT. This is the only action required to allow FGUs always, as kvm_calculate_traps() already computes the FGU bits with or without FEAT_FGT. This also fixes a spurious WARN when a TLBI OS is run on a guest in vEL1 without FEAT_TLBIOS on non FEAT_FGT hardware. In this configuration the course-grained HCR_EL2.TTLBOS trap reaches the handler handle_tlbi_el1(), which expects an EL1 TLBI only from vEL2. With FGUs enabled the UNDEF will be injected without needing the specific handler. [oliver: Take Wei-Lin's suggested changelog]
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 f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f ~ 2f4a15c52a552c5244ec27f4ca8bda855594f918 -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-98713

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III. Intelligence Information for CVE-2026-98713

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Patches & Fixes for CVE-2026-98713 (3)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
CVE-2026-98733 Bluetooth: hci_core: Serialize fragmented ISO packet queueing
CVE-2026-98732 Bluetooth: btintel: fix buffer over-read in btintel_hw_error()
CVE-2026-98731 Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame()
CVE-2026-98730 Bluetooth: btintel_pcie: reject oversized TX packets in send_frame()
CVE-2026-98729 x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h
CVE-2026-98728 tpm: fix off-by-four bounds check in tpm2_get_random()
CVE-2026-98727 nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
CVE-2026-98726 nvme-multipath: fix underflow in ANA log bounds checks
CVE-2026-98725 nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()
CVE-2026-98724 nvmet: pci-epf: reject too-short SGL segments
CVE-2026-98723 nvmet: copy the hostid into the ctrl before creating PR pc_refs
CVE-2026-98722 mtd: block2mtd: Fix divide error when erase_size is zero
CVE-2026-98721 mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown
CVE-2026-98711 wifi: cw1200: fix TX padding OOB read leaking heap data to device
CVE-2026-98710 wifi: iwlegacy: 3945: free EEPROM data on remove
CVE-2026-98709 wifi: mac80211: count only matching reservations in reserved switch
CVE-2026-98712 KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
CVE-2026-98708 wifi: mac80211: keep paired old chanctx alive

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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