{"api_version":"1","generated_at":"2026-09-17T23:44:40+00:00","cve":"CVE-2026-90303","urls":{"html":"https://cve.report/CVE-2026-90303","api":"https://cve.report/api/cve/CVE-2026-90303.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90303","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90303"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:27","updated_at":"2026-09-17 17:17:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545","name":"https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549","name":"https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7","name":"https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd","name":"https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba","name":"https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892","name":"https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66","name":"https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0","name":"https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90303","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90303","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6d021b724481fbb908eb29384898deb9f00dfe70 ab14f07952adfe735d86a53518f8cd576dfd5892 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6d021b724481fbb908eb29384898deb9f00dfe70 07e4d5380f2a844ab7a1b440dde350caf561cbb0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6d021b724481fbb908eb29384898deb9f00dfe70 2a14d7797a49a47bccd1a9327fd69da838dcb0dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6d021b724481fbb908eb29384898deb9f00dfe70 63e3c958a602d0896a101a897c2361878c266ca7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/arm/mm/fault.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ab14f07952adfe735d86a53518f8cd576dfd5892","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"07e4d5380f2a844ab7a1b440dde350caf561cbb0","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"2a14d7797a49a47bccd1a9327fd69da838dcb0dd","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"63e3c958a602d0896a101a897c2361878c266ca7","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"59bbf86d0ff9373bfa033ca123c1e924f09f1eba","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"c71f9a56520b419e55d173052629f2324deb5549","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"720408d98d9fb3c91a12090436734c8c61f04545","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"},{"lessThan":"1039bffd6ae9c75b42b7d148d6c1106134107b66","status":"affected","version":"6d021b724481fbb908eb29384898deb9f00dfe70","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/arm/mm/fault.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.0"},{"lessThan":"4.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:08:26.455Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892"},{"url":"https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0"},{"url":"https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd"},{"url":"https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7"},{"url":"https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba"},{"url":"https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549"},{"url":"https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545"},{"url":"https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66"}],"title":"ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90303","datePublished":"2026-09-17T16:08:26.455Z","dateReserved":"2026-09-11T19:38:34.799Z","dateUpdated":"2026-09-17T16:08:26.455Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:27","lastModifiedDate":"2026-09-17 17:17:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90303","Ordinal":"1","Title":"ARM: 9485/1: mm: acquire mmap write lock around show_pte() for u","CVE":"CVE-2026-90303","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90303","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ARM: 9485/1: mm: acquire mmap write lock around show_pte() for u"}]}}}