{"id":"CVE-2025-40293","state":"PUBLISHED","title":"iommufd: Don't overflow during division for dirty tracking","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Don't overflow during division for dirty tracking\n\nIf pgshift is 63 then BITS_PER_TYPE(*bitmap->bitmap) * pgsize will overflow\nto 0 and this triggers divide by 0.\n\nIn this case the index should just be 0, so reorganize things to divide\nby shift and avoid hitting any overflows.","publishedAt":"2025-12-08T00:46:16.850Z","updatedAt":"2026-05-11T21:46:32.879Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"07105e61882ff4a7d58db63cc5f9e90c6c60506c","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"de7f2c67ceb1941b05b04ac35458a03e93cc57b1","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"dbf316fc90aa954dcd5440817f4b944627ed63e0","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"cb30dfa75d55eced379a42fd67bd5fb7ec38555e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/iova_bitmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/iova_bitmap.c"]}],"references":["https://git.kernel.org/stable/c/07105e61882ff4a7d58db63cc5f9e90c6c60506c","https://git.kernel.org/stable/c/4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69","https://git.kernel.org/stable/c/de7f2c67ceb1941b05b04ac35458a03e93cc57b1","https://git.kernel.org/stable/c/dbf316fc90aa954dcd5440817f4b944627ed63e0","https://git.kernel.org/stable/c/cb30dfa75d55eced379a42fd67bd5fb7ec38555e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40293.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40293","state":"PUBLISHED","datePublished":"2025-12-08T00:46:16.850Z","dateUpdated":"2026-05-11T21:46:32.879Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.185Z"},"containers":{"cna":{"title":"iommufd: Don't overflow during division for dirty tracking","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Don't overflow during division for dirty tracking\n\nIf pgshift is 63 then BITS_PER_TYPE(*bitmap->bitmap) * pgsize will overflow\nto 0 and this triggers divide by 0.\n\nIn this case the index should just be 0, so reorganize things to divide\nby shift and avoid hitting any overflows."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"07105e61882ff4a7d58db63cc5f9e90c6c60506c","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"de7f2c67ceb1941b05b04ac35458a03e93cc57b1","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"dbf316fc90aa954dcd5440817f4b944627ed63e0","versionType":"git"},{"version":"58ccf0190d19d9a8a41f8a02b9e06742b58df4a1","status":"affected","lessThan":"cb30dfa75d55eced379a42fd67bd5fb7ec38555e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/iova_bitmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/iova_bitmap.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/07105e61882ff4a7d58db63cc5f9e90c6c60506c"},{"url":"https://git.kernel.org/stable/c/4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69"},{"url":"https://git.kernel.org/stable/c/de7f2c67ceb1941b05b04ac35458a03e93cc57b1"},{"url":"https://git.kernel.org/stable/c/dbf316fc90aa954dcd5440817f4b944627ed63e0"},{"url":"https://git.kernel.org/stable/c/cb30dfa75d55eced379a42fd67bd5fb7ec38555e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:46:32.879Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.1.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.12.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}