fuse: re-lock request before returning from fuse_ref_folio()

Summary

CVECVE-2026-64266
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:06 UTC
Updated2026-07-30 15:00:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001600000 probability, percentile 0.055930000 (date 2026-08-01)


VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 1f9156714592356b4fda57beac7eab9c2a462dd3 git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 5630da218a45ba80f0aba0846cbe8aa655da122b git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 1ca605cfa59377f0143fb35b5b01360f37d1b7c4 git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 0e4a5a000123d81234e27a2f8187688cf608f755 git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 e6aa539720c3d8def69683ed0c07cf9faea4e8be git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 be353caffa8640f5e25fb3714ce8b0cef5e410e5 git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 65a1c2551f7e16085acbb54aedde1feaa559ba7a git Not specified
CNA Linux Linux affected c3021629a0d820247ee12b6c5192a1d5380e21c6 b5befa80fdbe287a98480effed9564712924add5 git Not specified
CNA Linux Linux affected 2.6.35 Not specified
CNA Linux Linux unaffected 2.6.35 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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