xfs: handle NULL b_addr in xfs_buf_free

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74728
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:47 UTC
Updated2026-08-22 16:16:47 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5076a6040ca1613e616d84aecfaac5f932db84e0 ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 git Not specified
CNA Linux Linux affected 5076a6040ca1613e616d84aecfaac5f932db84e0 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 git Not specified
CNA Linux Linux affected 5076a6040ca1613e616d84aecfaac5f932db84e0 d852729c5f4f830fbe7413df032e29459b3daf83 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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