CVE-2026-89606

ecryptfs: reject too-small tag 70 packets

State: Published
Severity: 7.8 High
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9c79f34f7ee71cd28272332b424ca64b2be006ab to before df5f375a6151ef71f636da044bcef90c26697255Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before 5668121974eb7f7aa82793a9d0d13abadb8904dcAffected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before 2e5afed9503dd1d85004c09503adc2cb584c0188Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before 414a0f04feb06f03523edf7e2a8be1d7f1a9b160Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before 9d88391bbed76eb091cddd50b0af87b1c6f22589Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before b31da1ecf13929a8d7f8d2727843d2fe35396b75Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before d2869768eab5648e6edc05f47e0716e5328e6681Affected 9c79f34f7ee71cd28272332b424ca64b2be006ab to before e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7fAffected
LinuxLinux	2.6.29Affected before 2.6.29Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

9c79f34f7ee71cd28272332b424ca64b2be006ab to before df5f375a6151ef71f636da044bcef90c26697255Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before 5668121974eb7f7aa82793a9d0d13abadb8904dcAffected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before 2e5afed9503dd1d85004c09503adc2cb584c0188Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before 414a0f04feb06f03523edf7e2a8be1d7f1a9b160Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before 9d88391bbed76eb091cddd50b0af87b1c6f22589Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before b31da1ecf13929a8d7f8d2727843d2fe35396b75Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before d2869768eab5648e6edc05f47e0716e5328e6681Affected
9c79f34f7ee71cd28272332b424ca64b2be006ab to before e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7fAffected

LinuxLinux

2.6.29Affected
before 2.6.29Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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