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Vulnerability record · CVE-2026-53388 · published 19 July 2026

CVE-2026-53388: Linux kernel use after free vulnerability

Linux · Linux Kernel

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().

7.8 CVSS 3.1 High EPSS 0.13% · top 97.7% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Aug 2026Last modified by NVD

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().

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25 Patch
https://git.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407 Patch
https://git.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2 Patch
https://git.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4 Patch
https://git.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6 Patch
https://git.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120 Patch
https://git.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677 Patch
https://git.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53388), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.