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CVE-2026-89608· NVD / CVE Program· CNA Linux

ecryptfs: pass packet set buffer size to parser

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: 0.16% (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 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2, 329de8b9e988b152b938f09224670d97bada0b96, 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2, 329de8b9e988b152b938f09224670d97bada0b96, 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d 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: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it calculates the remaining packet buffer size from PAGE_SIZE - 8. For version 1 headers the packet set starts later in the header, so this can overstate the available buffer. Pass the actual packet set buffer length from the caller and calculate per-packet limits from the remaining bytes in that buffer. Recompute the remaining length after consuming a tag 3 packet before parsing the following tag 11 packet.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

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

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.

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-2026-89608

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.

—

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

    • 2.6.19affected
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before e7573b0e3058c6bbdfe81673f22c09900fde9e65affected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 66a87559ecb26afe80ad512faf728a158e2b81daaffected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 3bd9bb3e167a7c14a50423f6ff03ee0fb007199daffected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaacaffected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 329de8b9e988b152b938f09224670d97bada0b96affected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before e5d254e654f2311a3c4b9c791d7f216554bcd17aaffected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 747fd45be396a6aea3420ab657a0ab4e60185b05affected · git
    • 237fead619984cc48818fe12ee0ceada3f55b012 and later · before 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2affected · git
    • before 2.6.19not 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-2026-89606Sep 11, 2026 · ecryptfs: reject too-small tag 70 packets
    31Monitor
  • ← EarlierCVE-2026-89607Sep 11, 2026 · ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet
    31Monitor
  • Later →CVE-2026-89609Sep 11, 2026 · ecryptfs: hold msg ctx list lock when cleaning daemon queue
    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 Linux2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2Vendor (CNA)
Linux Linux329de8b9e988b152b938f09224670d97bada0b96Vendor (CNA)
Linux Linux3bd9bb3e167a7c14a50423f6ff03ee0fb007199dVendor (CNA)
Linux Linux66a87559ecb26afe80ad512faf728a158e2b81daVendor (CNA)
Linux Linux747fd45be396a6aea3420ab657a0ab4e60185b05Vendor (CNA)
Linux Linux749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaacVendor (CNA)
Linux Linuxe5d254e654f2311a3c4b9c791d7f216554bcd17aVendor (CNA)
Linux Linuxe7573b0e3058c6bbdfe81673f22c09900fde9e65Vendor (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
none
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
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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