{"id":"CVE-2026-90303","revision":"a8973a3fe94749238cdb58a4946d9255","records":[{"revision":"a8973a3fe94749238cdb58a4946d9255","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90303","aliases":[],"title":"ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults\n\nWhen CONFIG_DEBUG_USER=y, and cmdline \"user_debug=31\" is set,\na user fault may trigger show_pte() without any lock.\nIf another thread in the same process concurrently calls munmap(),\nthe page table pages may be freed while show_pte() is still traversing\nthem, causing a use-after-free in show_pte().\n\nIf CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table\nof PMD are freed when show_pte() is running.\n\nAcquire mmap_write_lock() around show_pte() for user faults to fix the\ncontention.\n\nFor user faults, additionally restrict that show_pte() is called only\nwhen the addr is a user-space address (addr < TASK_SIZE). This is because\nthe lock of tsk->mm only protects the virtual memory of user address space,\nfurthermore, dumping the page tables of a kernel-space address for user\nfaults is unnecessary and may have security implications.\n\nKeep everything unchanged for kernel faults, because the kernel is\nalready in the \"oops\" state, acquiring a lock may risk a deadlock.","state":0,"publishedAt":"2026-09-17T16:08:26.455+00:00","modifiedAt":"2026-10-19T09:01:21.209+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                        \"arch/arm/mm/fault.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"ab14f07952adfe735d86a53518f8cd576dfd5892\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"07e4d5380f2a844ab7a1b440dde350caf561cbb0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"2a14d7797a49a47bccd1a9327fd69da838dcb0dd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"63e3c958a602d0896a101a897c2361878c266ca7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"59bbf86d0ff9373bfa033ca123c1e924f09f1eba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"c71f9a56520b419e55d173052629f2324deb5549\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"720408d98d9fb3c91a12090436734c8c61f04545\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6d021b724481fbb908eb29384898deb9f00dfe70\",\n                            \"lessThan\": \"1039bffd6ae9c75b42b7d148d6c1106134107b66\",\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                        \"arch/arm/mm/fault.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892","https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0","https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd","https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7","https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba","https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549","https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545","https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90303","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90303","identifiers":["CVE-2026-90303"]},"retained":false,"historicalAffected":[]}],"coverage":[]}