NVD / CVE Program· CNA Linux

CVE-2026-46078: erofs: fix the out-of-bounds nameoff handling for trailing dirents

Noroxi assessment

Priority: Monitor (action score 28/100)

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: 0.13% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 1d55445226c75ddd4e78b09b3e7d99109b28c366, 222055e6b4063abd2d9e13c3d49bbd1724c50789, 48b27a955d22391c7f30169fa7b6b2e1977f1ce4; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1d55445226c75ddd4e78b09b3e7d99109b28c366, 222055e6b4063abd2d9e13c3d49bbd1724c50789, 48b27a955d22391c7f30169fa7b6b2e1977f1ce4; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: erofs: fix the out-of-bounds nameoff handling for trailing dirents Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs. If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block. nameoff0 should also be verified to be a multiple of `sizeof(struct erofs_dirent)` as well [1]. [1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com

HighCVSS 7.1 · v3.1—No exploit Fix available

Memory safety

Published: May 27, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-125

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.1; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel4.19 and later · before 5.10.259
linux linux kernel5.11 and later · before 5.15.210
linux linux kernel5.16 and later · before 6.1.175
linux linux kernel6.2 and later · before 6.6.140
linux linux kernel6.7 and later · before 6.12.86
linux linux kernel6.13 and later · before 6.18.27
linux linux kernel6.19 and later · before 7.0.4

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
- 4.19affected
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before a8ee527807f7d97e55ce2ef2906f7f34975eb1c7affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before aa16dca1b062355181ef215229eeac249d7c0d61affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before 80a23c6d1aba35be8746d74ac14e6ba5ae46da21affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before 222055e6b4063abd2d9e13c3d49bbd1724c50789affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before 48b27a955d22391c7f30169fa7b6b2e1977f1ce4affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before 8ebb951a284b7446e025afc7dc5e9516ef9a7214affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before 1d55445226c75ddd4e78b09b3e7d99109b28c366affected · git
- 3aa8ec716e52c02360457fa018296629b4d0becf and later · before d18a3b5d337fa412a38e776e6b4b857a58836575affected · git
- before 4.19not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.86-1	6.12.86-1
Debian:14	linux	before 7.0.4-1	7.0.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-46071May 27, 2026 · KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12
22Monitor
← EarlierCVE-2026-46076May 27, 2026 · KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
31Monitor
Later →CVE-2026-46083May 27, 2026 · spi: fix resource leaks on device setup failure
22Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	1d55445226c75ddd4e78b09b3e7d99109b28c366	Vendor (CNA)
Linux Linux	222055e6b4063abd2d9e13c3d49bbd1724c50789	Vendor (CNA)
Linux Linux	48b27a955d22391c7f30169fa7b6b2e1977f1ce4	Vendor (CNA)
Linux Linux	80a23c6d1aba35be8746d74ac14e6ba5ae46da21	Vendor (CNA)
Linux Linux	8ebb951a284b7446e025afc7dc5e9516ef9a7214	Vendor (CNA)
Linux Linux	a8ee527807f7d97e55ce2ef2906f7f34975eb1c7	Vendor (CNA)
Linux Linux	aa16dca1b062355181ef215229eeac249d7c0d61	Vendor (CNA)
Linux Linux	d18a3b5d337fa412a38e776e6b4b857a58836575	Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.0	6.6.141.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · Debian:12	Package 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.

No history yet (it accumulates with the daily EPSS job).

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).