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NVD / CVE Program· CNA Linux

CVE-2026-93269: ext4: fix circular lock dependency in ext4_ext_migrate

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 32f7ab52875ec7f800ca67e7176e5743a84baddf, 4.10, 4.15; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 32f7ab52875ec7f800ca67e7176e5743a84baddf, 4.10, 4.15; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ext4: fix circular lock dependency in ext4_ext_migrate Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a circular lock dependency between s_writepages_rwsem and sb_internal (freeze protection). The deadlock scenario: CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount) ---- ---- ext4_ext_migrate() ext4_writepages_down_write() s_writepages_rwsem (write) ext4_evict_inode() sb_start_intwrite() [sb_internal] ... ext4_writepages() s_writepages_rwsem (read) [BLOCKED] iput(tmp_inode) ext4_evict_inode() sb_start_intwrite() [BLOCKED] The tmp_inode is a temporary inode with nlink=0 created solely for building the extent tree. Its eviction does not require s_writepages_rwsem protection, so deferring iput() until after releasing the rwsem is safe.

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • eb799e163dc2bc1ea0a4820b66f79d32a5e907df, bcc1eab71a67c46b9e24544ac7923f44444174ce, 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9, e5d25003d059649e18a249635ed5ca7a7b1de5ad, 69f8a7991fd93c49096ddd11574db3e7df238b7b, 5.6affected
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before f204882d5eaca09f7848f081c9c9b5bbf2234895affected · git
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before 452950461241dfed8b1d32e94b227db38c99c5afaffected · git
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before ada23457d4748d6e9c36c6f871fc29a6f558c48caffected · git
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before e4223231b6860141813637a6413c2371ae4d6fa8affected · git
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before 32f7ab52875ec7f800ca67e7176e5743a84baddfaffected · git
    • cb85f4d23f794e24127f3e562cb3b54b0803f456 and later · before a897682793eba5de51ee6f3152760374afa629cfaffected · git
    • 4.9.215 and later · before 4.10affected · semver
    • 4.14.172 and later · before 4.15affected · semver
    • 4.19.107 and later · before 4.20affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-93267Sep 24, 2026 · RDMA/core: Fix potential use after free in uverbs_free_dmah()
    0Monitor
  • ← EarlierCVE-2026-93268Sep 24, 2026 · ext4: skip extra isize expansion during mount to prevent deadlock
    0Monitor
  • Later →CVE-2026-93270Sep 24, 2026 · bpf: Disallow interpreter fallback for BPF_ADDR_PERCPU insn
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux32f7ab52875ec7f800ca67e7176e5743a84baddfVendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux452950461241dfed8b1d32e94b227db38c99c5afVendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5.6Vendor (CNA)
Linux Linuxa897682793eba5de51ee6f3152760374afa629cfVendor (CNA)
Linux Linuxada23457d4748d6e9c36c6f871fc29a6f558c48cVendor (CNA)
Linux Linuxe4223231b6860141813637a6413c2371ae4d6fa8Vendor (CNA)
Linux Linuxf204882d5eaca09f7848f081c9c9b5bbf2234895Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records