{"id":"CVE-2026-74728","revision":"01385b3f4df24055b33a7da914698efa","records":[{"revision":"01385b3f4df24055b33a7da914698efa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74728","aliases":[],"title":"xfs: handle NULL b_addr in xfs_buf_free","description":"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 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.","state":0,"publishedAt":"2026-08-22T15:33:18.412+00:00","modifiedAt":"2026-10-21T12:46:17.289+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/xfs/xfs_buf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5076a6040ca1613e616d84aecfaac5f932db84e0\",\n                            \"lessThan\": \"444ff50ece93060131ad84fbd3f378723d8ac243\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5076a6040ca1613e616d84aecfaac5f932db84e0\",\n                            \"lessThan\": \"ccf6738adcafa5ddbddc4e71b45d8a51b86643c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5076a6040ca1613e616d84aecfaac5f932db84e0\",\n                            \"lessThan\": \"3aa0c1d23ee1b9d9b340fb2f4736536e1408d706\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5076a6040ca1613e616d84aecfaac5f932db84e0\",\n                            \"lessThan\": \"d852729c5f4f830fbe7413df032e29459b3daf83\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/xfs/xfs_buf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.45\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.9\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243","https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7","https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706","https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74728","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74728","identifiers":["CVE-2026-74728"]},"retained":false,"historicalAffected":[]}],"coverage":[]}