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CVE-2026-93239— arm64: mm: Fix the lockless page-table walk in show_pte()

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，已修复以下漏洞： arm64: mm: 修复 show_pte() 中的无锁页表遍历 show_pte() 在无锁状态下遍历页表，且可能在中断启用时运行。在遍历过程中，并发的页表销毁操作可能会释放正在被遍历的页表页。此外，show_pte() 检查父项后，其他操作可能会清除该父项；此时，常规的 pXd_offset() 辅助函数会重新读取已被清除的项，从而可能派生出错误的低级页表指针，并再次引发故障。 采用类似于 gup_fast() 的做法，使用无锁偏移辅助函数并保存父项，将保存的 PMD

AI Predicted 4.4 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1690 · Prevent Command History Logging

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 1d18c47c735e8adfe531fc41fae31e98f86b68fe< 08d931a0a850ad16a64f2cd23a19f40795cdbdf7 affected
1d18c47c735e8adfe531fc41fae31e98f86b68fe< b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1 affected
1d18c47c735e8adfe531fc41fae31e98f86b68fe< 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3 affected
1d18c47c735e8adfe531fc41fae31e98f86b68fe< 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad affected
1d18c47c735e8adfe531fc41fae31e98f86b68fe< a77644d009dece1104b6fcc6e322b0e4503db0d6 affected
3.7 affected
< 3.7 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-93239

Vulnerability Information
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Vulnerability Title
arm64: mm: Fix the lockless page-table walk in show_pte()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: arm64: mm: Fix the lockless page-table walk in show_pte() show_pte() walks page tables locklessly and can run with interrupts enabled. A concurrent teardown can free a table page while it is being walked. It can also clear a parent entry after show_pte() checked it; the regular pXd_offset() helpers then reread the cleared entry and can derive a bogus lower-level pointer and fault again. Use the lockless offset helpers with the saved parent entries, as gup_fast() does, and pass the saved PMD to pte_offset_map(). For task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable local interrupts around the walk to hold off RCU-deferred table frees and block the tlb_remove_table_sync_one() IPI until the walk is finished. Place the IRQ guard after the header print. This does not make the output a consistent snapshot, but prevents the task page-table walk from dereferencing a released table page or deriving a pointer from a different parent value.
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 1d18c47c735e8adfe531fc41fae31e98f86b68fe ~ 08d931a0a850ad16a64f2cd23a19f40795cdbdf7 -
Linux Linux 3.7 -

II. Public POCs for CVE-2026-93239

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III. Intelligence Information for CVE-2026-93239

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Patches & Fixes for CVE-2026-93239 (5)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93221 8.1 HIGH nfsd: convert nfsd_net boolean flags to unsigned long flags word
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93239

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