# CVE-2026-64057: linux: In the Linux kernel, the following vulnerability has been resolved:  afs: Fix the locking used by afs_get_link()  The...

CVE-2026-64057 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64057 (version 7.0.12-1), released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-64057
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0013
- 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:  afs: Fix the locking used by afs_get_link()  The afs filesystem in the kernel doesn't do locking correctly for symbolic links.  There are a number of problems:   (1) It doesn't do any locking around afs_read_single() to prevent races      between multiple ->get_link() calls, thereby allowing the possibility      of leaks.   (2) It doesn't use RCU barriering when accessing the buffer pointers      during RCU pathwalk.   (3) It can race with another thread updating the contents of the symlink      if a third party updated it on the server.  Fix this by the following means:   (0) Move symlink handling into its own file as this makes it more      complicated.   (1) Take the validate_lock around afs_read_single() to prevent races      between multiple ->get_link() calls.   (2) Keep a separate copy of the symlink contents with an rcu_head.  This      is always going to be a lot smaller than a page, so it can be      kmalloc'd and save quite a bit of memory.  It also needs a refcount      for non-RCU pathwalk.   (3) Split the symlink read and write-to-cache routines in afs from those      for directories.   (4) Discard the I/O buffer as soon as the write-to-cache completes as this      is a full page (plus a folio_queue).   (5) If there's no cache, discard the I/O buffer immediately after reading      and copying if there is no cache.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.12-1 | [DEBIAN-CVE-2026-64057](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64057.md) | Jul 20, 2026 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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