{"id":"CVE-2026-74728","summary":"xfs: handle NULL b_addr in xfs_buf_free","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: handle NULL b_addr in xfs_buf_free\n\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp-\u003eb_addr still NULL.  The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\n\n Call Trace:\n  xfs_buf_free+0x25f/0x510\n  xfs_buf_alloc+0xc98/0x19b0\n  xfs_buf_find_insert+0x55/0x14d0\n  xfs_buf_get_map+0x122b/0x17c0\n  xfbtree_init_leaf_block+0x11c/0x4a0\n  xfbtree_init+0x1bb/0x460\n  xrep_rmap_setup_scan+0x100/0x1f0\n  xrep_rmapbt+0x41/0xc0\n\nFix this by skipping folio_put() when bp-\u003eb_addr is NULL.","modified":"2026-08-24T11:47:22.776347904Z","published":"2026-08-22T15:33:18.412Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74728.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74728.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74728"},{"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":"5076a6040ca1613e616d84aecfaac5f932db84e0"},{"fixed":"ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"},{"fixed":"3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"},{"fixed":"d852729c5f4f830fbe7413df032e29459b3daf83"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74728.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74728.json"}}],"schema_version":"1.9.0"}