{"id":"CVE-2026-98242","summary":"dma-buf: Fix silent overflow for phys vec to sgt","details":"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.","modified":"2026-10-08T02:52:54.576181907Z","published":"2026-10-06T08:45:12.662Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98242.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98242.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98242"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3aa31a8bb11e47c0ff2b306988d1756b810c1c3c"},{"fixed":"6b98fd7106d4e486f432664893dcd4d6fa3a9693"},{"fixed":"b344ca94e8cc85796f16ea25e2e5a8e0303fe813"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98242.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98242.json"}}],"schema_version":"1.9.0"}