Common Weakness Enumeration
CWE-911
AllowedImproper Update of Reference Count
Abstraction: Base · Status: Incomplete
The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count.
30 vulnerabilities reference this CWE, most recent first.
CVE-2022-29581 (GCVE-0-2022-29581)
Vulnerability from cvelistv5 – Published: 2022-05-17 16:50 – Updated: 2025-04-21 13:53
VLAI
EPSS
VEX
Summary
Improper Update of Reference Count vulnerability in net/sched of Linux Kernel allows local attacker to cause privilege escalation to root. This issue affects: Linux Kernel versions prior to 5.18; version 4.14 and later versions.
Severity
7.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-21 13:39 UTC
CWE
- CWE-911 - Improper Update of Reference Count
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
| https://kernel.dance/#3db09e762dc79584a69c10d74a6… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/05/18/2 | mailing-listx_refsource_MLIST |
| http://packetstormsecurity.com/files/167386/Kerne… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022062… | x_refsource_CONFIRM |
| https://www.debian.org/security/2022/dsa-5173 | vendor-advisoryx_refsource_DEBIAN |
| http://packetstormsecurity.com/files/168191/Kerne… | x_refsource_MISC |
Impacted products
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CVE-2022-22195 (GCVE-0-2022-22195)
Vulnerability from cvelistv5 – Published: 2022-04-14 15:50 – Updated: 2024-09-16 23:11
VLAI
EPSS
VEX
Title
Junos OS Evolved: Specific packets reaching the RE lead to a counter overflow and eventually a crash
Summary
An Improper Update of Reference Count vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to trigger a counter overflow, eventually causing a Denial of Service (DoS). This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R3-S1-EVO; 21.1 versions prior to 21.1R3-EVO; 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO. This issue does not affect Juniper Networks Junos OS.
Severity
7.5 (High)
CWE
- CWE-911 - Improper Update of Reference Count
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA69508 | x_refsource_CONFIRM |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS Evolved |
Affected:
unspecified , < 20.4R3-S1-EVO
(custom)
Affected: 21.1 , < 21.1R3-EVO (custom) Affected: 21.2 , < 21.2R3-EVO (custom) Affected: 21.3 , < 21.3R2-EVO (custom) |
|
| Juniper Networks | Junos OS |
Unaffected:
any
|
Date Public
2022-04-13 00:00
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CVE-2022-1678 (GCVE-0-2022-1678)
Vulnerability from cvelistv5 – Published: 2022-05-25 14:49 – Updated: 2024-08-03 00:10
VLAI
EPSS
VEX
Summary
An issue was discovered in the Linux Kernel from 4.18 to 4.19, an improper update of sock reference in TCP pacing can lead to memory/netns leak, which can be used by remote clients.
Severity
5.9 (Medium)
CWE
- CWE-911 - Improper Update of Reference Count
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://bugzilla.openanolis.cn/show_bug.cgi?id=61 | x_refsource_CONFIRM |
| https://lore.kernel.org/all/20200602080425.93712-… | x_refsource_MISC |
| https://github.com/torvalds/linux/commit/0a70f118… | x_refsource_MISC |
| https://gitee.com/anolis/cloud-kernel/commit/bed5… | x_refsource_MISC |
| https://anas.openanolis.cn/cves/detail/CVE-2022-1678 | x_refsource_MISC |
| https://anas.openanolis.cn/errata/detail/ANSA-2022:0143 | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022071… | x_refsource_CONFIRM |
Impacted products
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CVE-2020-11935 (GCVE-0-2020-11935)
Vulnerability from cvelistv5 – Published: 2023-04-07 00:00 – Updated: 2024-08-04 11:42
VLAI
EPSS
VEX
Title
aufs: improperly managed inode reference counts in the vfsub_dentry_open() method
Summary
It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.
Severity
4.4 (Medium)
CWE
- CWE-911 - Improper Update of Reference Count
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://ubuntu.com/security/CVE-2020-11935 | vendor-advisory |
| https://bugs.launchpad.net/bugs/1873074 | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Ubuntu | Linux kernel (aufs filesystem module) |
Unaffected:
4.4.0-186.216 , < 4.4*
(custom)
Unaffected: 4.15.0-112.113 , < 4.15* (custom) Unaffected: 5.4.0-42.46 , < 5.4* (custom) |
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GHSA-3HMC-JXR7-RW7J
Vulnerability from github – Published: 2023-10-24 00:31 – Updated: 2024-07-24 18:31
VLAI
Details
The reference count changes made as part of the CVE-2023-33951 and CVE-2023-33952 fixes exposed a use-after-free flaw in the way memory objects were handled when they were being used to store a surface. When running inside a VMware guest with 3D acceleration enabled, a local, unprivileged user could potentially use this flaw to escalate their privileges.
Severity
7.8 (High)
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"id": "GHSA-3hmc-jxr7-rw7j",
"modified": "2024-07-24T18:31:15Z",
"published": "2023-10-24T00:31:07Z",
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GHSA-4WXW-3VRC-3HMH
Vulnerability from github – Published: 2025-02-18 21:32 – Updated: 2025-05-13 21:30
VLAI
Details
A flaw was found in grub2. When failing to mount an HFS+ grub, the hfsplus filesystem driver doesn't properly set an ERRNO value. This issue may lead to a NULL pointer access.
Severity
4.4 (Medium)
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"id": "GHSA-4wxw-3vrc-3hmh",
"modified": "2025-05-13T21:30:28Z",
"published": "2025-02-18T21:32:51Z",
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GHSA-5XP2-X7QR-WJRX
Vulnerability from github – Published: 2023-03-29 21:30 – Updated: 2023-04-06 15:30
VLAI
Details
This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation OPC UA C++ Demo Server 1.7.6-537. Authentication is not required to exploit this vulnerability. The specific flaw exists within the OpcUa_SecureListener_ProcessSessionCallRequest method. A crafted OPC UA message can force the server to incorrectly update a reference count. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-16927.
Severity
7.5 (High)
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"id": "GHSA-5xp2-x7qr-wjrx",
"modified": "2023-04-06T15:30:18Z",
"published": "2023-03-29T21:30:20Z",
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},
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GHSA-8W7W-2RV7-QQW7
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-07-03 18:42
VLAI
Details
In the Linux kernel, the following vulnerability has been resolved:
iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails
arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0.
The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak.
Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.
Severity
7.1 (High)
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],
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"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:19Z",
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"modified": "2024-07-03T18:42:48Z",
"published": "2024-05-21T15:31:43Z",
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GHSA-9MF5-X83C-FG2X
Vulnerability from github – Published: 2026-08-20 21:31 – Updated: 2026-08-20 21:31
VLAI
Details
Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.
Severity
5.9 (Medium)
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],
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"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-20T21:17:10Z",
"severity": "MODERATE"
},
"details": "Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.",
"id": "GHSA-9mf5-x83c-fg2x",
"modified": "2026-08-20T21:31:30Z",
"published": "2026-08-20T21:31:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77587"
},
{
"type": "WEB",
"url": "https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9VMW-8F7F-QHCH
Vulnerability from github – Published: 2023-04-24 21:30 – Updated: 2024-04-04 03:40
VLAI
Details
A flaw was found in the Linux kernel's netdevsim device driver, within the scheduling of events. This issue results from the improper management of a reference count. This may allow an attacker to create a denial of service condition on the system.
Severity
4.4 (Medium)
{
"affected": [],
"aliases": [
"CVE-2023-2019"
],
"database_specific": {
"cwe_ids": [
"CWE-911"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-04-24T21:15:09Z",
"severity": "MODERATE"
},
"details": "A flaw was found in the Linux kernel\u0027s netdevsim device driver, within the scheduling of events. This issue results from the improper management of a reference count. This may allow an attacker to create a denial of service condition on the system.",
"id": "GHSA-9vmw-8f7f-qhch",
"modified": "2024-04-04T03:40:14Z",
"published": "2023-04-24T21:30:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-2019"
},
{
"type": "WEB",
"url": "https://github.com/torvalds/linux/commit/180a6a3ee60a"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2189137"
},
{
"type": "WEB",
"url": "https://www.zerodayinitiative.com/advisories/ZDI-CAN-17811"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.