Unknown

CVE-2026-72159 — ocfs2: reject non-inline dinodes with i_size and zero i_clusters

In 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().

Published Aug 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 13% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 416d3e5f8a30ed04fe21ba7dc73c2841c3b56265≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < ed0f938f946f16b772e99cb8c277ab57828e5be4≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 83f6756a7b71adec0a41ae68e079a38906d59c6c≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 38c1ef7ce50eb4af0f89038b8aba12396ddb9233≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < d837068eefbc2651fe5789bf75a0f945710f7b8e≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 2174c68f623b74bd8690a4a6a4a52882d8ac3dc3≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 3bfeb436d4be6a2beb56cab344770e93e6b07260≥ b657c95c11088d77fc1bfc9c84d940f778bf9d12 and < 7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 and 1 more version 2.6.29	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 30, 2026 · 15 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 15, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265
NIST National Vulnerability Database
git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260
NIST National Vulnerability Database
git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4
NIST National Vulnerability Database
git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e
NIST National Vulnerability Database
git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4
NIST National Vulnerability Database
git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233
NIST National Vulnerability Database
git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c
NIST National Vulnerability Database
git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-72159 is "ocfs2: reject non-inline dinodes with i_size and zero i_clusters", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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