{"id":"CVE-2026-74728","title":"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->b_addr still NULL","summary":"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->b_addr still NULL.  The code falls through to the fol…","severity":"none","published":"2026-08-22","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74728","references":[{"url":"https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00206,"epssPercentile":0.09916,"ingestedAt":"2026-10-14T13:30:58.549Z","slug":"CVE-2026-74728","body":"## Overview\n\nIn 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->b_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->b_addr is NULL.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}