VulnerabilityPublished 19 Jul 2026

CVE-2026-64060: Linux kernel · netfs: Fix leak of request in netfs_write_begin() error handling

Source GCVE Database

Authoritative record:CVE-2026-64060

Not known to be exploited · CVSS 5.5 Medium · fixed in 28686d6d8b60dc5bbae9ef6023ab2051d6c66cdf : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 3.1 base score

5.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 28686d6d8b60dc5bbae9ef6023ab2051d6c66cdf, 9192f304379187b396d56d6a1a406712c6bfa5a3, 5046a34f0643441f05b0253ea64e1a3af87efe14 +1

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

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-hp9w-255m-3fwf

What to do

Upgrade Linux kernel to 28686d6d8b60dc5bbae9ef6023ab2051d6c66cdf, 9192f304379187b396d56d6a1a406712c6bfa5a3, 5046a34f0643441f05b0253ea64e1a3af87efe14 or 22ae28aae43623be235ff455558cdd13fbe2daeb.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4090b31422a6f24dfe701e31ffec7ba5804a7e2f, < 28686d6d8b60dc5bbae9ef6023ab2051d6c66cdf	Fixed in 28686d6d8b60dc5bbae9ef6023ab2051d6c66cdf
LinuxLinux	Affected ≥ 4090b31422a6f24dfe701e31ffec7ba5804a7e2f, < 9192f304379187b396d56d6a1a406712c6bfa5a3	Fixed in 9192f304379187b396d56d6a1a406712c6bfa5a3
LinuxLinux	Affected ≥ 4090b31422a6f24dfe701e31ffec7ba5804a7e2f, < 5046a34f0643441f05b0253ea64e1a3af87efe14	Fixed in 5046a34f0643441f05b0253ea64e1a3af87efe14
LinuxLinux	Affected ≥ 4090b31422a6f24dfe701e31ffec7ba5804a7e2f, < 22ae28aae43623be235ff455558cdd13fbe2daeb	Fixed in 22ae28aae43623be235ff455558cdd13fbe2daeb
LinuxLinux	Affected =5.18	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this resource leak vulnerability. Users and administrators should apply the official kernel updates that include this fix once available. Patch status is not explicitly confirmed in the provided data; therefore, verify with the official Linux kernel advisories or vendor updates for the precise remediation status.

Description

A vulnerability in the Linux kernel's netfs subsystem was fixed to address a resource leak issue. The flaw involved leaking a reference to a request object in the netfs_write_begin() function when an error occurred during netfs_wait_for_read(). This could lead to resource management issues within the kernel. The vulnerability has been resolved by correcting the error handling to prevent the leak.

Impact

The vulnerability results in a resource leak within the Linux kernel's netfs subsystem, which could potentially degrade system stability or performance over time due to unreleased kernel resources. There is no information indicating direct exploitation or broader security impact such as privilege escalation or denial of service.

Summary

The Linux kernel contained a vulnerability in the netfs_write_begin() function where, upon encountering an error from netfs_wait_for_read(), the code failed to properly release a reference to a request object, causing a resource leak. This issue was fixed by updating the error handling logic to ensure the reference is not leaked. No CVSS score or detailed impact metrics are provided, and no known exploits are reported.

References

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