7.8
HIGH
CVSS 3.1
CVE-2026-64266
fuse: re-lock request before returning from fuse_ref_folio()
Overview
Description
In 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.
Details
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Re-lock the request in fuse_ref_folio() before returning to prevent use-after-free.
- Lock the request before returning from fuse_ref_folio().
- Apply the kernel patch for fuse_ref_folio().
- Update the Linux kernel to the patched version.
References
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CVE-2026-64266.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64266 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64266
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-64266 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64266 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1f9156714592356b4fda57beac7eab9c2a462dd3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '5630da218a45ba80f0aba0846cbe8aa655da122b', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1ca605cfa59377f0143fb35b5b01360f37d1b7c4', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '0e4a5a000123d81234e27a2f8187688cf608f755', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'e6aa539720c3d8def69683ed0c07cf9faea4e8be', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'be353caffa8640f5e25fb3714ce8b0cef5e410e5', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '65a1c2551f7e16085acbb54aedde1feaa559ba7a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'b5befa80fdbe287a98480effed9564712924add5', 'versionType': 'git'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.35'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.35', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1f9156714592356b4fda57beac7eab9c2a462dd3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '5630da218a45ba80f0aba0846cbe8aa655da122b', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1ca605cfa59377f0143fb35b5b01360f37d1b7c4', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '0e4a5a000123d81234e27a2f8187688cf608f755', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'e6aa539720c3d8def69683ed0c07cf9faea4e8be', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'be353caffa8640f5e25fb3714ce8b0cef5e410e5', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '65a1c2551f7e16085acbb54aedde1feaa559ba7a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'b5befa80fdbe287a98480effed9564712924add5', 'versionType': 'git'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.35'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.35', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.96 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.35 up to (excluding) 5.10.261 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1f9156714592356b4fda57beac7eab9c2a462dd3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '5630da218a45ba80f0aba0846cbe8aa655da122b', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '1ca605cfa59377f0143fb35b5b01360f37d1b7c4', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '0e4a5a000123d81234e27a2f8187688cf608f755', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'e6aa539720c3d8def69683ed0c07cf9faea4e8be', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'be353caffa8640f5e25fb3714ce8b0cef5e410e5', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': '65a1c2551f7e16085acbb54aedde1feaa559ba7a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c3021629a0d820247ee12b6c5192a1d5380e21c6', 'lessThan': 'b5befa80fdbe287a98480effed9564712924add5', 'versionType': 'git'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.35'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.35', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/fuse/dev.c'], 'defaultStatus': 'affected'}] Added Description In 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. Added Reference https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755 Added Reference https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4 Added Reference https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3 Added Reference https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b Added Reference https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a Added Reference https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5 Added Reference https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5 Added Reference https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.