CVE-2026-89606
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux
PublishedSep 11, 2026
First seenSep 11, 2026
How to fix
Update
- Linux Linuxdf5f375a6151ef71f636da044bcef90c26697255, 5668121974eb7f7aa82793a9d0d13abadb8904dc, 2e5afed9503dd1d85004c09503adc2cb584c0188, 414a0f04feb06f03523edf7e2a8be1d7f1a9b160, 9d88391bbed76eb091cddd50b0af87b1c6f22589, b31da1ecf13929a8d7f8d2727843d2fe35396b75, d2869768eab5648e6edc05f47e0716e5328e6681, e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < df5f375a6151ef71f636da044bcef90c26697255, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < 5668121974eb7f7aa82793a9d0d13abadb8904dc, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < 2e5afed9503dd1d85004c09503adc2cb584c0188, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < 414a0f04feb06f03523edf7e2a8be1d7f1a9b160, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < 9d88391bbed76eb091cddd50b0af87b1c6f22589, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < b31da1ecf13929a8d7f8d2727843d2fe35396b75, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < d2869768eab5648e6edc05f47e0716e5328e6681, 9c79f34f7ee71cd28272332b424ca64b2be006ab ≤ v < e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f, 2.6.29 | df5f375a6151ef71f636da044bcef90c26697255, 5668121974eb7f7aa82793a9d0d13abadb8904dc, 2e5afed9503dd1d85004c09503adc2cb584c0188, 414a0f04feb06f03523edf7e2a8be1d7f1a9b160, 9d88391bbed76eb091cddd50b0af87b1c6f22589, b31da1ecf13929a8d7f8d2727843d2fe35396b75, d2869768eab5648e6edc05f47e0716e5328e6681, e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f |
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