CVE-2026-53388

fuse: re-lock request before replacing page cache folio

State: Published
Severity: 7.8 High
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

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().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 7c18691e0cfda29672f79bafde8abdb7710674f6Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 5927b43a4f8d89e86930f524bf63e9c7e66f61b4Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 030fe3e9d8abdee303dd7e9e42f45082d382a407Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 46473ddccdc5065033e397d6e62c280dbcd3d9c2Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before af2892249d982a1c036ca456cc135374e68b6677Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 0223f452532d9cd8a5e87c45de828fd93c99bd25Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before e28db6ac4792d065ab32565fd9f0a2361c3d4666Affected ce534fb052928ce556639d7ecf01cbf4e01321e1 to before a078484921052d0badd827fcc2770b5cfc1d4120Affected
LinuxLinux	2.6.35Affected before 2.6.35Not affected 5.15.211 through 5.15.Not affected 6.1.177 through 6.1.Not affected 6.6.144 through 6.6.Not affected 6.12.95 through 6.12.Not affected 6.18.37 through 6.18.Not affected 7.0.14 through 7.0.Not affected 7.1.2 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 7c18691e0cfda29672f79bafde8abdb7710674f6Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 5927b43a4f8d89e86930f524bf63e9c7e66f61b4Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 030fe3e9d8abdee303dd7e9e42f45082d382a407Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 46473ddccdc5065033e397d6e62c280dbcd3d9c2Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before af2892249d982a1c036ca456cc135374e68b6677Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before 0223f452532d9cd8a5e87c45de828fd93c99bd25Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before e28db6ac4792d065ab32565fd9f0a2361c3d4666Affected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to before a078484921052d0badd827fcc2770b5cfc1d4120Affected

LinuxLinux

2.6.35Affected
before 2.6.35Not affected
5.15.211 through 5.15.*Not affected
6.1.177 through 6.1.*Not affected
6.6.144 through 6.6.*Not affected
6.12.95 through 6.12.*Not affected
6.18.37 through 6.18.*Not affected
7.0.14 through 7.0.*Not affected
7.1.2 through 7.1.*Not affected
7.2 and laterNot affected

References

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