# CVE-2026-64067: linux: In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix missing barriers when accessing strea...

CVE-2026-64067 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64067 (version 7.0.12-1), released July 20, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-64067
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0050
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 19, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix missing barriers when accessing stream->subrequests locklessly  The list of subrequests attached to stream->subrequests is accessed without locks by netfs_collect_read_results() and netfs_collect_write_results(), and then they access subreq->flags without taking a barrier after getting the subreq pointer from the list.  Relatedly, the functions that build the list don't use any sort of write barrier when constructing the list to make sure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if no lock is taken.  Fix this by:   (1) Add a new list_add_tail_release() function that uses a release barrier      to set the pointer to the new member of the list.   (2) Add a new list_first_entry_or_null_acquire() function that uses an      acquire barrier to read the pointer to the first member in a list (or      return NULL).   (3) Use list_add_tail_release() when adding a subreq to ->subrequests.   (4) Use list_first_entry_or_null_acquire() when initially accessing the      front of the list (when an item is removed, the pointer to the new      front iterm is obtained under the same lock).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.12-1 | [DEBIAN-CVE-2026-64067](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64067.md) | Jul 20, 2026 |

---

Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.