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CVE-2026-98546— arm64/boot: Disable trapping of PMZR_EL0 writes to 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： arm64/引导：禁用对 PMZR_EL0 写入的 EL2 异常捕获 __init_el2_fgt2() 函数将同一个掩码同时写入 HDFGRTR2_EL2 和 HDFGWTR2_EL2 寄存器。由于 PMZR_EL0 是只写寄存器，其对应的异常捕获位 nPMZR_EL0 仅存在于 HDFGWTR2_EL2 中，因此该位从未被设置。这导致从主机（EL0）发起的 PMZR_EL0 写入操作会异常捕获到 EL2，而 nVHE（非虚拟化扩展）Hypervisor 在该处没有对

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 686d8f7b592f3466f44aea653c8147611b351c83< bb8c90c86441c090e9036f019cf1b4d7894a2c40 affected
858c7bfcb35e1100b58bb63c9f562d86e09418d9< 071f51188a5d8ec10535541255587976d12fc7d8 affected
858c7bfcb35e1100b58bb63c9f562d86e09418d9< ce71865bf43f88bed9d9218e9218e537150be506 affected
858c7bfcb35e1100b58bb63c9f562d86e09418d9< 2bc6b218717b9d08f466f88209251d54bc09b207 affected
882f78400322c0aec4b641a7168adad9a66bc0c2 affected
6.12.25< 6.12.112 affected
6.14.4< 6.15 affected
6.15 affected
… +5 more rows
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I. Basic Information for CVE-2026-98546

Vulnerability Information
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Vulnerability Title
arm64/boot: Disable trapping of PMZR_EL0 writes to EL2
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits.
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 686d8f7b592f3466f44aea653c8147611b351c83 ~ bb8c90c86441c090e9036f019cf1b4d7894a2c40 -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-98546

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III. Intelligence Information for CVE-2026-98546

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Patches & Fixes for CVE-2026-98546 (3)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98583 nfc: nfcmrvl: validate helper command length before pull
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98546

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