CVE-2026-89606 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-89606? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89606? +

CVE-2026-89606 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-89606? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-89606