{"id":"CVE-2026-98242","state":"PUBLISHED","title":"dma-buf: Fix silent overflow for phys vec to sgt","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: Fix silent overflow for phys vec to sgt\n\nIn case MMIO size is bigger than 4G and peer2peer DMA goes\nthrough host bridge, we trigger a code path that assigns the\ntotal linked IOVA (which is greater than 4G) to mapped_len.\n\nPreviously, `mapped_len` was declared as 32-bit `unsigned int`.\nWhen accumulating `size_t` lengths, this leads to a silent wrap-around.\nThis truncation causes truncated lengths to be passed to functions\nlike `fill_sg_entry()`.\n\nFix this by changing `mapped_len` to `size_t` (64-bit). While\nat it, fix similar potential overflow issues in `calc_sg_nents`\nby using `check_add_overflow()` for `nents` and using\n`unsigned int` for the loop iterator in `fill_sg_entry` to match.","publishedAt":"2026-10-06T08:45:12.662Z","updatedAt":"2026-10-19T09:16:13.758Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3aa31a8bb11e47c0ff2b306988d1756b810c1c3c","status":"affected","lessThan":"6b98fd7106d4e486f432664893dcd4d6fa3a9693","versionType":"git"},{"version":"3aa31a8bb11e47c0ff2b306988d1756b810c1c3c","status":"affected","lessThan":"b344ca94e8cc85796f16ea25e2e5a8e0303fe813","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/dma-buf-mapping.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/dma-buf-mapping.c"]}],"references":["https://git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693","https://git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98242.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98242","state":"PUBLISHED","datePublished":"2026-10-06T08:45:12.662Z","dateUpdated":"2026-10-19T09:16:13.758Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.330Z"},"containers":{"cna":{"title":"dma-buf: Fix silent overflow for phys vec to sgt","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: Fix silent overflow for phys vec to sgt\n\nIn case MMIO size is bigger than 4G and peer2peer DMA goes\nthrough host bridge, we trigger a code path that assigns the\ntotal linked IOVA (which is greater than 4G) to mapped_len.\n\nPreviously, `mapped_len` was declared as 32-bit `unsigned int`.\nWhen accumulating `size_t` lengths, this leads to a silent wrap-around.\nThis truncation causes truncated lengths to be passed to functions\nlike `fill_sg_entry()`.\n\nFix this by changing `mapped_len` to `size_t` (64-bit). While\nat it, fix similar potential overflow issues in `calc_sg_nents`\nby using `check_add_overflow()` for `nents` and using\n`unsigned int` for the loop iterator in `fill_sg_entry` to match."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3aa31a8bb11e47c0ff2b306988d1756b810c1c3c","status":"affected","lessThan":"6b98fd7106d4e486f432664893dcd4d6fa3a9693","versionType":"git"},{"version":"3aa31a8bb11e47c0ff2b306988d1756b810c1c3c","status":"affected","lessThan":"b344ca94e8cc85796f16ea25e2e5a8e0303fe813","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/dma-buf-mapping.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/dma-buf-mapping.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693"},{"url":"https://git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:16:13.758Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}