Linux Kernel up to 7.1.3 posix-cpu-timers do_cpu_nanosleep reference count

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k3.87-

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.1.3. This issue affects the function do_cpu_nanosleep of the component posix-cpu-timers. This manipulation causes reference count. This vulnerability is tracked as CVE-2026-64370. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.1.3. Affected by this vulnerability is the function do_cpu_nanosleep of the component posix-cpu-timers. The manipulation with an unknown input leads to a reference count vulnerability. The CWE definition for the vulnerability is CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-64370 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 $0-$5k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch afed3cdc1cca133f804fcf57ff228974f424b23a/8a270b1258797f61b61da44f8bfd41a581b5c85b/d605d00085adc3fddf67de01dc2a44aebf1a3fb5/e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0/eb4cec29a78334d09bcfb41c0660cdd62ba05843/7776f9226e99eb49d97492b0b445027cfcb189da/8f06363446c5d043c9a7c008b250040e9de98cf9/87bd2ad568e15b90d5f7d4bcd70342d05dad649c 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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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: Reference count
CWE: CWE-911 / CWE-664
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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: afed3cdc1cca133f804fcf57ff228974f424b23a/8a270b1258797f61b61da44f8bfd41a581b5c85b/d605d00085adc3fddf67de01dc2a44aebf1a3fb5/e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0/eb4cec29a78334d09bcfb41c0660cdd62ba05843/7776f9226e99eb49d97492b0b445027cfcb189da/8f06363446c5d043c9a7c008b250040e9de98cf9/87bd2ad568e15b90d5f7d4bcd70342d05dad649c

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-2026-64370 (🔒)
GCVE (CVE): GCVE-0-2026-64370
GCVE (VulDB): GCVE-100-383167

Entryinfo

Created: 07/25/2026 17:34
Changes: 07/25/2026 17:34 (59)
Complete: 🔍
Cache ID: 216::103

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