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 | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.18Upgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade bpftool6.18Upgrade kernel6.18-debuginfoUpgrade python3-perf6.18Upgrade kernel6.18-develUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.18-headersUpgrade kernel6.18-modules-extraUpgrade microvm-kernel6.18Upgrade kernel-livepatch-6.18.48-107.148Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18Upgrade kernel6.18-tools-devel | Sep 30, 2026 | Aug 22, 2026 |
| Redhat_linux | — | No solution exists | Aug 26, 2026 | Aug 22, 2026 |
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