Unknown

CVE-2026-93268 — ext4: skip extra isize expansion during mount to prevent deadlock

In the Linux kernel, the following vulnerability has been resolved: ext4: skip extra isize expansion during mount to prevent deadlock ext4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty() while holding an active jbd2 handle. During mount (!SB_ACTIVE), the expand path may move xattrs to external blocks and release ea_inodes via iput(). When !SB_ACTIVE, iput() calls write_inode_now() which acquires s_writepages_rwsem, creating a circular lock dependency: s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem This can be triggered via: ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() or: ext4_evict_inode() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() Skip expansion when !SB_ACTIVE. This is a minor loss of functionality (extra isize won't grow for these inodes during mount), which e2fsck can resolve later if needed.

Published Sep 24, 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)+1

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

0.2%

ahead of 9% of scored CVEs · Oct 16, 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	≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 41897f1bcf4ace5f1f28d0be784b6f4f0e929641≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 9c3469377b1d8caba6bec6ef3c460810bbfb02cc≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 1dd4882dbdc8bfdf2182fa388883c143fac0902a≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 7ba09330d9ea6e996228316719eae812d7e04983≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < c5e6434cc55f30220b228be237bb666351f9f4dd≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 7ace189b9ea79cf78df9c32b940ce12735f9459a≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 2fb8ff81659a57c42bb7b49e8339a2be2a318ef8≥ c8585c6fcaf2011de54c3592e80a634a2b9e1a7f and < 7461c60b9c6a839b13ad4c3490681a0cf5aa0637 and 1 more version 4.7	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.20%

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
Sep 24, 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/41897f1bcf4ace5f1f28d0be784b6f4f0e929641
NIST National Vulnerability Database
git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a
NIST National Vulnerability Database
git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc
NIST National Vulnerability Database
git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8
NIST National Vulnerability Database
git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a
NIST National Vulnerability Database
git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637
NIST National Vulnerability Database
git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd
NIST National Vulnerability Database
git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 3d

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-2026-93268 is "ext4: skip extra isize expansion during mount to prevent deadlock", 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 0.20% 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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