{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90303","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.799Z","datePublished":"2026-09-17T16:08:26.455Z","dateUpdated":"2026-09-17T16:08:26.455Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:08:26.455Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mm/fault.c"],"versions":[{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"ab14f07952adfe735d86a53518f8cd576dfd5892","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"07e4d5380f2a844ab7a1b440dde350caf561cbb0","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"2a14d7797a49a47bccd1a9327fd69da838dcb0dd","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"63e3c958a602d0896a101a897c2361878c266ca7","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"59bbf86d0ff9373bfa033ca123c1e924f09f1eba","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"c71f9a56520b419e55d173052629f2324deb5549","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"720408d98d9fb3c91a12090436734c8c61f04545","status":"affected","versionType":"git"},{"version":"6d021b724481fbb908eb29384898deb9f00dfe70","lessThan":"1039bffd6ae9c75b42b7d148d6c1106134107b66","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mm/fault.c"],"versions":[{"version":"4.0","status":"affected"},{"version":"0","lessThan":"4.0","status":"unaffected","versionType":"semver"},{"version":"5.10.270","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.221","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"7.3-rc1"}]}]}],"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"}}}}