CVE-2026-74728 PUBLISHED

xfs: handle NULL b_addr in xfs_buf_free

Assigner: Linux
Reserved: 15.08.2026 Published: 22.08.2026 Updated: 22.08.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 5076a6040ca1613e616d84aecfaac5f932db84e0 to ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 (excl.)
  • affected from 5076a6040ca1613e616d84aecfaac5f932db84e0 to 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 (excl.)
  • affected from 5076a6040ca1613e616d84aecfaac5f932db84e0 to d852729c5f4f830fbe7413df032e29459b3daf83 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.9 is affected
  • unaffected from 0 to 6.9 (excl.)
  • unaffected from 6.18.45 to 6.18.* (incl.)
  • unaffected from 7.1.9 to 7.1.* (incl.)
  • unaffected from 7.2 to * (incl.)

References