{"id":"CVE-2026-46280","revision":null,"records":[{"revision":"56a7b50434f0482695d83092a5bf76b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46280","aliases":[],"title":"lib: test_hmm: evict device pages on file close to avoid use-after-free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel selftests. These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first. This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg. during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct. The function is moved earlier\nin the file to avoid a forward declaration.","state":0,"publishedAt":"2026-06-08T15:41:23.095+00:00","modifiedAt":"2026-10-19T19:36:56.915+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"lib/test_hmm.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"234071b4318feaeb27cd2e4e1b16ef6b055adf89\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"bf477abd448c76bb8ea51c9b4f63a3a17c4b6239\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"5846715b6382dd4c6a69b35a56ca6115d33bc2a0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"38f113f81d3f0adc658a4475dd3ecaec985e21d3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b2ef9f5a5cb37643ca5def3516c546457074b882\",\n \"lessThan\": \"744dd97752ef1076a8d8672bb0d8aa2c7abc1144\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"lib/test_hmm.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.8\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.8\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.140\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.86\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.27\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.4\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89","https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239","https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0","https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3","https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1","https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46280","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46280","identifiers":["CVE-2026-46280"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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