What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.29 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2e5afed9503dd1d85004c09503adc2cb584c0188
• https://git.kernel.org/stable/c/414a0f04feb06f03523edf7e2a8be1d7f1a9b160
• https://git.kernel.org/stable/c/5668121974eb7f7aa82793a9d0d13abadb8904dc
• https://git.kernel.org/stable/c/9d88391bbed76eb091cddd50b0af87b1c6f22589
• https://git.kernel.org/stable/c/b31da1ecf13929a8d7f8d2727843d2fe35396b75
• https://git.kernel.org/stable/c/d2869768eab5648e6edc05f47e0716e5328e6681
• https://git.kernel.org/stable/c/df5f375a6151ef71f636da044bcef90c26697255
• https://git.kernel.org/stable/c/e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f

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