Linux Kernel up to 6.12.95/6.18.38/7.1.3 FUSE fuse_resend/fuse_remove_pending_req intr_entry use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k2.33-

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.95/6.18.38/7.1.3. It has been rated as very critical. Impacted is the function fuse_resend/fuse_remove_pending_req of the component FUSE. This manipulation of the argument intr_entry causes use after free. This vulnerability is tracked as CVE-2026-64265. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.95/6.18.38/7.1.3. It has been declared as very critical. Affected by this vulnerability is the function fuse_resend/fuse_remove_pending_req of the component FUSE. The manipulation of the argument intr_entry with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req When fuse_resend() moves a request from fpq->processing back to fiq->pending, it sets FR_PENDING and clears FR_SENT but does not remove the requests intr_entry from fiq->interrupts. If the request had FR_INTERRUPTED set from a prior signal, intr_entry remains dangling on fiq->interrupts. When the requesting task then receives a fatal signal, fuse_remove_pending_req() sees FR_PENDING=1, removes the request from fiq->pending and frees it via the refcount path, also without cleaning intr_entry. The stale intr_entry causes use-after-free when fuse_read_interrupt() iterates fiq->interrupts: - list_del_init(&req->intr_entry) -> UAF write on freed slab - req->in.h.unique -> UAF read, data leaked to userspace Remove intr_entry from fiq->interrupts in fuse_resend() for interrupted requests before they are placed back on fiq->pending. Add a WARN_ON if the intr_entry is not empty on request destruction.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-64265 since 07/19/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c/7366e6f4d2b4c7002b13fb01219e83679dad4127/893479015cb6442fd389d3b553ab3036c9541715/f8fce75fedf73ac72aa09163deb8f4291fdcaad2 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c/7366e6f4d2b4c7002b13fb01219e83679dad4127/893479015cb6442fd389d3b553ab3036c9541715/f8fce75fedf73ac72aa09163deb8f4291fdcaad2

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64265 (🔒)
GCVE (CVE): GCVE-0-2026-64265
GCVE (VulDB): GCVE-100-383047

Entryinfo

Created: 07/25/2026 11:55
Changes: 07/25/2026 11:55 (60)
Complete: 🔍
Cache ID: 216::103

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