ecryptfs: reject too-small tag 70 packets

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89606
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:45 UTC
Updated2026-09-13 07:17:26 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001380000 probability, percentile 0.035030000 (date 2026-09-13)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9c79f34f7ee71cd28272332b424ca64b2be006ab 9d88391bbed76eb091cddd50b0af87b1c6f22589 git Not specified
CNA Linux Linux affected 9c79f34f7ee71cd28272332b424ca64b2be006ab b31da1ecf13929a8d7f8d2727843d2fe35396b75 git Not specified
CNA Linux Linux affected 9c79f34f7ee71cd28272332b424ca64b2be006ab d2869768eab5648e6edc05f47e0716e5328e6681 git Not specified
CNA Linux Linux affected 9c79f34f7ee71cd28272332b424ca64b2be006ab e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9d88391bbed76eb091cddd50b0af87b1c6f22589 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2869768eab5648e6edc05f47e0716e5328e6681 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b31da1ecf13929a8d7f8d2727843d2fe35396b75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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