ocfs2: reject non-inline dinodes with i_size and zero i_clusters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72159
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:33 UTC
Updated2026-08-15 06:21:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ocfs2: reject non-inline dinodes with i_size and zero i_clusters On a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a non-inline regular file with non-zero i_size and zero i_clusters is structurally malformed: the extent map declares no allocated clusters yet the size header claims content exists. Keep rejecting that shape, but express it through a shared predicate so the same invariant is available to normal inode reads and online filecheck. The same zero-cluster shape is also malformed for non-inline directories. ocfs2 directory growth allocates backing storage before advancing i_size, and ocfs2_dir_foreach_blk_el() later walks until ctx->pos reaches i_size_read(inode). A forged directory dinode with a huge i_size and no clusters would repeatedly fail on holes while advancing through the claimed size. Sparse regular files remain exempt: on sparse-alloc volumes, truncate can legitimately grow i_size without allocating clusters. System inodes and inline-data dinodes also retain their separate storage rules. Mirror the check in ocfs2_filecheck_validate_inode_block() as well. filecheck reports through its own error namespace, so malformed size/cluster state is logged as a filecheck invalid-inode result rather than via ocfs2_error(), but it must not proceed into ocfs2_populate_inode().

Risk And Classification

EPSS: 0.002200000 probability, percentile 0.127450000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 416d3e5f8a30ed04fe21ba7dc73c2841c3b56265 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 ed0f938f946f16b772e99cb8c277ab57828e5be4 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 83f6756a7b71adec0a41ae68e079a38906d59c6c git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 38c1ef7ce50eb4af0f89038b8aba12396ddb9233 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 d837068eefbc2651fe5789bf75a0f945710f7b8e git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 2174c68f623b74bd8690a4a6a4a52882d8ac3dc3 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 3bfeb436d4be6a2beb56cab344770e93e6b07260 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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