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NVD / CVE Program· CNA Linux

CVE-2026-89606: ecryptfs: reject too-small tag 70 packets

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2e5afed9503dd1d85004c09503adc2cb584c0188, 414a0f04feb06f03523edf7e2a8be1d7f1a9b160, 5668121974eb7f7aa82793a9d0d13abadb8904dc.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2e5afed9503dd1d85004c09503adc2cb584c0188, 414a0f04feb06f03523edf7e2a8be1d7f1a9b160, 5668121974eb7f7aa82793a9d0d13abadb8904dc 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: ecryptfs: reject too-small tag 70 packets ecryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the parsed packet body size to derive the encrypted filename size. A malformed packet with a body smaller than those fixed fields can underflow that size calculation. Reject tag 70 packets before the subtraction unless the body contains the signature, cipher code, and at least one byte of encrypted filename data.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
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.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-89606

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

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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

    • 2.6.29affected
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before df5f375a6151ef71f636da044bcef90c26697255affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before 5668121974eb7f7aa82793a9d0d13abadb8904dcaffected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before 2e5afed9503dd1d85004c09503adc2cb584c0188affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before 414a0f04feb06f03523edf7e2a8be1d7f1a9b160affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before 9d88391bbed76eb091cddd50b0af87b1c6f22589affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before b31da1ecf13929a8d7f8d2727843d2fe35396b75affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before d2869768eab5648e6edc05f47e0716e5328e6681affected · git
    • 9c79f34f7ee71cd28272332b424ca64b2be006ab and later · before e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7faffected · git
    • before 2.6.29not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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-2026-89604Sep 11, 2026 · efivarfs: Rate limit statfs() handler
    0Monitor
  • ← EarlierCVE-2026-89605Sep 11, 2026 · ecryptfs: release message context on send failure
    31Monitor
  • Later →CVE-2026-89607Sep 11, 2026 · ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet
    31Monitor

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 Linux2e5afed9503dd1d85004c09503adc2cb584c0188Vendor (CNA)
Linux Linux414a0f04feb06f03523edf7e2a8be1d7f1a9b160Vendor (CNA)
Linux Linux5668121974eb7f7aa82793a9d0d13abadb8904dcVendor (CNA)
Linux Linux9d88391bbed76eb091cddd50b0af87b1c6f22589Vendor (CNA)
Linux Linuxb31da1ecf13929a8d7f8d2727843d2fe35396b75Vendor (CNA)
Linux Linuxd2869768eab5648e6edc05f47e0716e5328e6681Vendor (CNA)
Linux Linuxdf5f375a6151ef71f636da044bcef90c26697255Vendor (CNA)
Linux Linuxe97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7fVendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records