Riskcovery

CVE-2026-74728

xfs: handle NULL b_addr in xfs_buf_free

State
Published
Severity
Not scored
Published
Aug 22, 2026
Updated
Oct 21, 2026
Reserved
Aug 15, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 5076a6040ca1613e616d84aecfaac5f932db84e0 to before 444ff50ece93060131ad84fbd3f378723d8ac243Affected
  • 5076a6040ca1613e616d84aecfaac5f932db84e0 to before ccf6738adcafa5ddbddc4e71b45d8a51b86643c7Affected
  • 5076a6040ca1613e616d84aecfaac5f932db84e0 to before 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706Affected
  • 5076a6040ca1613e616d84aecfaac5f932db84e0 to before d852729c5f4f830fbe7413df032e29459b3daf83Affected
LinuxLinux
  • 6.9Affected
  • before 6.9Not affected
  • 6.12.114 through 6.12.*Not affected
  • 6.18.45 through 6.18.*Not affected
  • 7.1.9 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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