{"id":"CVE-2026-74728","state":"PUBLISHED","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.","publishedAt":"2026-08-22T15:33:18.412Z","updatedAt":"2026-10-21T12:46:17.289Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"444ff50ece93060131ad84fbd3f378723d8ac243","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"ccf6738adcafa5ddbddc4e71b45d8a51b86643c7","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"3aa0c1d23ee1b9d9b340fb2f4736536e1408d706","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"d852729c5f4f830fbe7413df032e29459b3daf83","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/xfs/xfs_buf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/xfs/xfs_buf.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74728.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74728","state":"PUBLISHED","datePublished":"2026-08-22T15:33:18.412Z","dateUpdated":"2026-10-21T12:46:17.289Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.929Z"},"containers":{"cna":{"title":"xfs: handle NULL b_addr in xfs_buf_free","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"444ff50ece93060131ad84fbd3f378723d8ac243","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"ccf6738adcafa5ddbddc4e71b45d8a51b86643c7","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"3aa0c1d23ee1b9d9b340fb2f4736536e1408d706","versionType":"git"},{"version":"5076a6040ca1613e616d84aecfaac5f932db84e0","status":"affected","lessThan":"d852729c5f4f830fbe7413df032e29459b3daf83","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/xfs/xfs_buf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/xfs/xfs_buf.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243"},{"url":"https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"},{"url":"https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"},{"url":"https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:46:17.289Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}