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CVE-2026-90303— ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults

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： ARM: 9485/1: mm: 在用户态缺页时，在 show_pte() 周围获取 mmap 写锁 当启用了 ，并在内核启动参数中设置了 时，用户态缺页（user fault）可能在未持有任何锁的情况下触发 。如果同一进程中的另一个线程并发调用 ，页表页可能在 仍在其上遍历时被释放，从而导致 中发生释放后使用（use-after-free）。 如果启用了 ，当 运行时 PMD 的页表页被释放，可能会引发内核恐慌（kernel panic）。 修复措施： 1. 在用户态缺页

AI Predicted 7.1 Difficulty: Hard EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6d021b724481fbb908eb29384898deb9f00dfe70< ab14f07952adfe735d86a53518f8cd576dfd5892 affected
6d021b724481fbb908eb29384898deb9f00dfe70< 07e4d5380f2a844ab7a1b440dde350caf561cbb0 affected
6d021b724481fbb908eb29384898deb9f00dfe70< 2a14d7797a49a47bccd1a9327fd69da838dcb0dd affected
6d021b724481fbb908eb29384898deb9f00dfe70< 63e3c958a602d0896a101a897c2361878c266ca7 affected
6d021b724481fbb908eb29384898deb9f00dfe70< 59bbf86d0ff9373bfa033ca123c1e924f09f1eba affected
6d021b724481fbb908eb29384898deb9f00dfe70< c71f9a56520b419e55d173052629f2324deb5549 affected
6d021b724481fbb908eb29384898deb9f00dfe70< 720408d98d9fb3c91a12090436734c8c61f04545 affected
6d021b724481fbb908eb29384898deb9f00dfe70< 1039bffd6ae9c75b42b7d148d6c1106134107b66 affected
… +10 more rows
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I. Basic Information for CVE-2026-90303

Vulnerability Information
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Vulnerability Title
ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.
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 6d021b724481fbb908eb29384898deb9f00dfe70 ~ ab14f07952adfe735d86a53518f8cd576dfd5892 -
Linux Linux 4.0 -

II. Public POCs for CVE-2026-90303

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III. Intelligence Information for CVE-2026-90303

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Patches & Fixes for CVE-2026-90303 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90303

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