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CVE-2026-46280— lib: test_hmm: evict device pages on file close to avoid use-after-free

CVSS 7.8 · High EPSS 0.12% · P3

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882< 234071b4318feaeb27cd2e4e1b16ef6b055adf89affected
b2ef9f5a5cb37643ca5def3516c546457074b882< bf477abd448c76bb8ea51c9b4f63a3a17c4b6239affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 5846715b6382dd4c6a69b35a56ca6115d33bc2a0affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 38f113f81d3f0adc658a4475dd3ecaec985e21d3affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1affected
b2ef9f5a5cb37643ca5def3516c546457074b882< 744dd97752ef1076a8d8672bb0d8aa2c7abc1144affected
5.8affected
< 5.8unaffected
… +6 more rows
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I. Basic Information for CVE-2026-46280

Vulnerability Information
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Vulnerability Title
lib: test_hmm: evict device pages on file close to avoid use-after-free
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib: test_hmm: evict device pages on file close to avoid use-after-free Patch series "Minor hmm_test fixes and cleanups". Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems. This patch (of 3): When dmirror_fops_release() is called it frees the dmirror struct but doesn't migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror. If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages. Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于设备页面在文件关闭时未迁移回系统内存，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux b2ef9f5a5cb37643ca5def3516c546457074b882 ~ 234071b4318feaeb27cd2e4e1b16ef6b055adf89 -
LinuxLinux 5.8 -

II. Public POCs for CVE-2026-46280

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III. Intelligence Information for CVE-2026-46280

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Patches & Fixes for CVE-2026-46280 (6)

Same Patch Batch · Linux · 2026-06-08 · 41 CVEs total

CVE-2026-462899.8 CRITICALlib/scatterlist: fix length calculations in extract_kvec_to_sg
CVE-2026-462888.4 HIGHof: unittest: fix use-after-free in of_unittest_changeset()
CVE-2026-463078.3 HIGHwifi: ath5k: do not access array OOB
CVE-2026-463038.2 HIGHisofs: validate Rock Ridge CE continuation extent against volume size
CVE-2026-462777.8 HIGHmm/zone_device: do not touch device folio after calling ->folio_free()
CVE-2026-463117.8 HIGHdrm/amdgpu/userq: fix access to stale wptr mapping
CVE-2026-462747.8 HIGHio-wq: check that the predecessor is hashed in io_wq_remove_pending()
CVE-2026-462757.8 HIGHBluetooth: hci_uart: fix UAFs and race conditions in close and init paths
CVE-2026-463067.5 HIGHflow_dissector: do not dissect PPPoE PFC frames
CVE-2026-463047.5 HIGHnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free
CVE-2026-462997.0 HIGHhfsplus: fix held lock freed on hfsplus_fill_super()
CVE-2026-46281vmalloc: fix buffer overflow in vrealloc_node_align()
CVE-2025-71315drm/vkms: Convert to DRM's vblank timer
CVE-2026-46287net: txgbe: fix RTNL assertion warning when remove module
CVE-2026-46286leds: qcom-lpg: Check for array overflow when selecting the high resolution
CVE-2026-46285mtd: docg3: fix use-after-free in docg3_release()
CVE-2026-46284mm/hugetlb: fix early boot crash on parameters without '=' separator
CVE-2026-46283tpm: Use kfree_sensitive() to free auth session in tpm_dev_release()
CVE-2026-46282iio: frequency: admv1013: fix NULL pointer dereference on str
CVE-2026-46279mm/alloc_tag: clear codetag for pages allocated before page_ext initialization

Showing top 20 of 41 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46280

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