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CVE-2026-53388

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before replacing page cache folio fuse_try_move_folio() unlocks the request on entry but does not re-lock…

Published Jul 19, 2026CWE-416EPSS 0.13%

Overview

CVE-2026-53388 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

fuse: re-lock request before replacing page cache folio

fuse_try_move_folio() unlocks the request on entry but does not

re-lock it on the success path. This means fuse_chan_abort() can end the

request and free the fuse_io_args (eg fuse_readpages_end()) while the

subsequent copy chain logic after fuse_try_move_folio() accesses the

fuse_io_args, leading to use-after-free issues.

Fix this by calling lock_request() before replace_page_cache_folio().

This ensures the request is locked on the success path which will

prevent the fuse_io_args from being freed while the later copying logic

runs, and also ensures that the ap->folios[i]->mapping is never null

since ap->folios[i] will always point to the newfolio after

replace_page_cache_folio().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25Refgit.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407Refgit.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2Refgit.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4Refgit.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6Refgit.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120Refgit.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677Refgit.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53388?

CVE-2026-53388 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53388?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53388?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53388?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53388 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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