CVE-2026-74728
Description
In the Linux kernel, the following vulnerability has been resolved: xfs: handle NULL b_addr in xfs_buf_free When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the folio_put path which calls virt_to_folio(NULL), dereferencing an invalid address and causing a kernel crash. Call Trace: xfs_buf_free+0x25f/0x510 xfs_buf_alloc+0xc98/0x19b0 xfs_buf_find_insert+0x55/0x14d0 xfs_buf_get_map+0x122b/0x17c0 xfbtree_init_leaf_block+0x11c/0x4a0 xfbtree_init+0x1bb/0x460 xrep_rmap_setup_scan+0x100/0x1f0 xrep_rmapbt+0x41/0xc0 Fix this by skipping folio_put() when bp->b_addr is NULL.
How to fix
- Linux Linux444ff50ece93060131ad84fbd3f378723d8ac243, ccf6738adcafa5ddbddc4e71b45d8a51b86643c7, 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706, d852729c5f4f830fbe7413df032e29459b3daf83 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5076a6040ca1613e616d84aecfaac5f932db84e0 ≤ v < 444ff50ece93060131ad84fbd3f378723d8ac243, 5076a6040ca1613e616d84aecfaac5f932db84e0 ≤ v < ccf6738adcafa5ddbddc4e71b45d8a51b86643c7, 5076a6040ca1613e616d84aecfaac5f932db84e0 ≤ v < 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706, 5076a6040ca1613e616d84aecfaac5f932db84e0 ≤ v < d852729c5f4f830fbe7413df032e29459b3daf83, 6.9 | 444ff50ece93060131ad84fbd3f378723d8ac243, ccf6738adcafa5ddbddc4e71b45d8a51b86643c7, 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706, d852729c5f4f830fbe7413df032e29459b3daf83 |
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