{"id":"CVE-2023-53171","state":"PUBLISHED","title":"vfio/type1: prevent underflow of locked_vm via exec()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: prevent underflow of locked_vm via exec()\n\nWhen a vfio container is preserved across exec, the task does not change,\nbut it gets a new mm with locked_vm=0, and loses the count from existing\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\nto a large unsigned value, and a subsequent dma map request fails with\nENOMEM in __account_locked_vm.\n\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\ntask's mm, which may have changed.  If the saved mm is dead, do nothing.\n\nlocked_vm is incremented for existing mappings in a subsequent patch.","publishedAt":"2025-09-15T14:04:04.544Z","updatedAt":"2026-05-11T19:39:38.716Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"5a271242716846cc016736fb76be2b40ee49b0c3","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"eafb81c50da899dd80b340c841277acc4a1945b7","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"a6b2aabe664098d5cf877ae0fd96459464a30e17","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"b0790dff0760b7734cf0961f497ad64628ca550b","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"046eca5018f8a5dd1dc2cedf87fb5843b9ea3026","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_iommu_type1.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.6","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_iommu_type1.c"]}],"references":["https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3","https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7","https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17","https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b","https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53171.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53171","state":"PUBLISHED","datePublished":"2025-09-15T14:04:04.544Z","dateUpdated":"2026-05-11T19:39:38.716Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-15T13:59:19.064Z"},"containers":{"cna":{"title":"vfio/type1: prevent underflow of locked_vm via exec()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: prevent underflow of locked_vm via exec()\n\nWhen a vfio container is preserved across exec, the task does not change,\nbut it gets a new mm with locked_vm=0, and loses the count from existing\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\nto a large unsigned value, and a subsequent dma map request fails with\nENOMEM in __account_locked_vm.\n\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\ntask's mm, which may have changed.  If the saved mm is dead, do nothing.\n\nlocked_vm is incremented for existing mappings in a subsequent patch."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"5a271242716846cc016736fb76be2b40ee49b0c3","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"eafb81c50da899dd80b340c841277acc4a1945b7","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"a6b2aabe664098d5cf877ae0fd96459464a30e17","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"b0790dff0760b7734cf0961f497ad64628ca550b","versionType":"git"},{"version":"73fa0d10d077d9521ee2dace2307ae2c9a965336","status":"affected","lessThan":"046eca5018f8a5dd1dc2cedf87fb5843b9ea3026","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_iommu_type1.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.6","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_iommu_type1.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3"},{"url":"https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7"},{"url":"https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17"},{"url":"https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b"},{"url":"https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:39:38.716Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"5.10.173"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"5.15.99"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}