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CVE-2026-90391— lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone

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： lib/test_hmm：当被镜像的 mm 已消失时，使 dmirror_fault() 返回失败 会在 和 的重试循环中被调用，前提是 或 检测到设备页表项缺失。 如果被镜像的 mm 已经退出， 将失败。当前代码在这种情况下返回 0，这会误导调用方认为缺页处理已成功完成，但实际上既没有完成缺页，也没有安装任何设备页表项。调用方随后会再次对同一地址进行重试，再次遇到 错误，从而陷入无限循环而毫无进展。 修复方式是改为返回 ，以便在被镜像的 mm 不再可缺页时，对应的 i

AI Predicted 4.4 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b2ef9f5a5cb37643ca5def3516c546457074b882< 50606ced303782f8715e2d0b98ca374ea498fa29 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 541a67f21ab807c8dbc0ea88d5a2eb73b2618090 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< d8e64ffab01e032ae29159d27230ace8cf8bdc80 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 2636569ea7c19d9a40db4a1e8d0a027bdacf1569 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 701347e31aa607f3782403151a3125729d685275 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< a2074f86fc9653831e4fb7b711bb715db330f182 affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 6a8024511ddf4877435c34fb3d6028aa8e590649 affected
… +10 more rows
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I. Basic Information for CVE-2026-90391

Vulnerability Information
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Vulnerability Title
lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone dmirror_fault() is called from the dmirror_read() and dmirror_write() retry loops after dmirror_do_read() or dmirror_do_write() finds a missing device page table entry. If the mirrored mm has already exited, mmget_not_zero() fails. The current code returns 0 in that case, which tells the caller that faulting succeeded even though no page was faulted and no device page table entry was installed. The caller then retries the same address, hits -ENOENT again, and can loop forever without making progress. Return -EFAULT instead, so the ioctl fails when the mirrored mm is no longer faultable.
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 b2ef9f5a5cb37643ca5def3516c546457074b882 ~ 50606ced303782f8715e2d0b98ca374ea498fa29 -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-90391

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III. Intelligence Information for CVE-2026-90391

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Patches & Fixes for CVE-2026-90391 (6)

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

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
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-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too

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-2026-90391

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