CVE Intelligence
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CVE-2026-90420 — nilfs2: fix infinite loop in nilfs_clean_segments()

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix infinite loop in nilfs_clean_segments() syzbot reported a hung task in nilfs_transaction_begin(). This occurs because the cleaner ioctl falls into an infinite loop if nilfs_segctor_construct() repeatedly returns -EROFS (e.g. the device is remounted as read-only after an I/O error). Currently in nilfs_clean_segments(), if err is non-zero, it logs the error and sleeps but doesn't abort when it encounters a terminal error like -EROFS. This causes the thread to loop forever. Fix this by breaking out of the loop if nilfs_segctor_construct() returns -EROFS. This matches the behaviour in nilfs_segctor_write_out(), which also handles -EROFS.

Published Sep 17, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

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 12% of scored CVEs · Oct 16, 2026
Affects
Linux
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.

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

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Linux Linux ≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < e3e9367dae1a6392cbb14ab0b2ab5edbf39735c3≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < 217b967ad7887a3e1ebc08f46f6484e081acd4b4≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < 3bcdbdaac884a4baa59716cf9bd9470c75276e2d≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < d7afca8e4efbf4c455b4663c29ae59fde2f1b671≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < c07e5ad6539e7e9350d5c65cbf8adb69d1711b15≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < 1fc6df85b4954b6fda9c351843aaca3c06f66d8d≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < 8cea0bc78ac64cb88da49c07f80bf2cf9fb7aff8≥ 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 and < ce5a5ad1a8330a2fcfdd9ec2ab341be739e89a18
and 1 more version 2.6.30
Vulnerable CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 16, 2026 · 2 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
    Sep 17, 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

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

  • CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 4h
  • CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 4h
  • CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 4h
  • CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 4h
  • CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 4h
  • CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 4h

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-2026-90420 is "nilfs2: fix infinite loop in nilfs_clean_segments()", 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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