RHSA-2026:13681
Vulnerability from csaf_redhat - Published: 2026-05-05 10:20 - Updated: 2026-05-05 21:16Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration (CVE-2026-23097)
* kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() (CVE-2026-23193)
* kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)
* kernel: crypto: algif_aead - Revert to operating out-of-place (CVE-2026-31431)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the Linux kernel. A local attacker could exploit a deadlock vulnerability due to incorrect lock ordering between folio_lock and i_mmap_rwsem when migrating hugetlb file-backed folios. This could lead to hung tasks and potential system-wide stalls, resulting in a Denial of Service (DoS).
7.3 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:13681
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() In iscsit_dec_session_usage_count(), the function calls complete() while holding the sess->session_usage_lock. Similar to the connection usage count logic, the waiter signaled by complete() (e.g., in the session release path) may wake up and free the iscsit_session structure immediately. This creates a race condition where the current thread may attempt to execute spin_unlock_bh() on a session structure that has already been deallocated, resulting in a KASAN slab-use-after-free. To resolve this, release the session_usage_lock before calling complete() to ensure all dereferences of the sess pointer are finished before the waiter is allowed to proceed with deallocation.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:13681
Workaround
To mitigate this issue, prevent module iscsi_target_mod from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
A flaw was found in the Linux kernel's NFSv4.0 server (nfsd). A remote, unauthenticated attacker can exploit this heap overflow vulnerability in the NFSv4.0 LOCK replay cache. By using two cooperating NFSv4.0 clients, where one sets a lock with a large owner string and another requests a conflicting lock, the attacker can trigger a slab-out-of-bounds write. This corruption of adjacent heap memory could lead to arbitrary code execution or a denial of service.
7.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:13681
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in the Linux kernel's algif_aead cryptographic algorithm interface. An incorrect 'in-place operation' was introduced, where the source and destination data mappings were different. This could lead to unexpected behavior or data integrity issues during cryptographic operations, potentially impacting the reliability of encrypted communications.
7.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:13681
Workaround
Individual articles, with specific advice, are available for a number of products:
* Red Hat Enterprise Linux https://access.redhat.com/solutions/7141931
* OpenShift 4 https://access.redhat.com/solutions/7141979
* ROSA Classic and OpenShift Dedicated https://access.redhat.com/articles/7141989
* ARO https://access.redhat.com/solutions/7141990
* Advanced Cluster Management Governance Policy https://access.redhat.com/solutions/7142032
* ROSA HCP: https://access.redhat.com/solutions/7141996
General guidance which is applicable to many products is below. Warning: there may be performance impacts for modifying functionality that uses kernel cryptographic functions. Though the affected module cannot be blacklisted, the affected functions themselves can be using the following boot arguments:
```
initcall_blacklist=algif_aead_init
```
Alternatively, the af_alg interface itself can be blocked:
```
initcall_blacklist=af_alg_init
```
As a further alternative, the affected algorithm can be blocked:
```
initcall_blacklist=crypto_authenc_esn_module_init
```
A mitigation that does not require a reboot using eBPF is available for Red Hat OpenShift Container Platform. This mitigation is only applicable to AMD64 nodes. Specific instructions are included in the linked articles.
References
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"text": "A flaw was found in the Linux kernel. A local attacker could exploit a deadlock vulnerability due to incorrect lock ordering between folio_lock and i_mmap_rwsem when migrating hugetlb file-backed folios. This could lead to hung tasks and potential system-wide stalls, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
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"text": "kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A deadlock can occur when migrating hugetlb file backed folios due to incorrect lock ordering between folio_lock and the mapping i_mmap_rwsem. One task in the migration path can hold folio_lock and then block on i_mmap_lock_read. Another task such as hugetlbfs fallocate or punch hole can hold i_mmap_lock_write and then block on folio_lock. This ABBA pattern can hang tasks indefinitely and lead to a denial of service. For the CVSS the PR is N because the involved operations can be triggered by normal users who can access hugetlbfs and run memory pressure and file operations. The issue is not network reachable. Impact is denial of service due to hung tasks and potential system wide stalls.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:13681"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration"
},
{
"cve": "CVE-2026-23193",
"cwe": {
"id": "CWE-364",
"name": "Signal Handler Race Condition"
},
"discovery_date": "2026-02-14T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2439887"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()\n\nIn iscsit_dec_session_usage_count(), the function calls complete() while\nholding the sess-\u003esession_usage_lock. Similar to the connection usage count\nlogic, the waiter signaled by complete() (e.g., in the session release\npath) may wake up and free the iscsit_session structure immediately.\n\nThis creates a race condition where the current thread may attempt to\nexecute spin_unlock_bh() on a session structure that has already been\ndeallocated, resulting in a KASAN slab-use-after-free.\n\nTo resolve this, release the session_usage_lock before calling complete()\nto ensure all dereferences of the sess pointer are finished before the\nwaiter is allowed to proceed with deallocation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A use after free can occur in the iSCSI target session usage count logic because iscsit_dec_session_usage_count can call complete while holding session_usage_lock. A waiting thread in the session release path can wake up and free the session structure immediately after the completion is signaled. The current thread may then attempt to unlock or otherwise access fields in a session object that has already been deallocated which can trigger a slab use after free and crash the kernel. The attack surface is adjacent network because iSCSI targets are typically reachable only inside storage or data center networks. Impact can be denial of service. A conservative assessment also considers potential confidentiality and integrity impact due to kernel memory corruption from a use after free.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-23193"
},
{
"category": "external",
"summary": "RHBZ#2439887",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439887"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23193",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23193"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23193",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23193"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026021434-CVE-2026-23193-2c6c@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026021434-CVE-2026-23193-2c6c@gregkh/T"
}
],
"release_date": "2026-02-14T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-05T10:20:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:13681"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module iscsi_target_mod from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()"
},
{
"cve": "CVE-2026-31402",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-04-03T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2454844"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s NFSv4.0 server (nfsd). A remote, unauthenticated attacker can exploit this heap overflow vulnerability in the NFSv4.0 LOCK replay cache. By using two cooperating NFSv4.0 clients, where one sets a lock with a large owner string and another requests a conflicting lock, the attacker can trigger a slab-out-of-bounds write. This corruption of adjacent heap memory could lead to arbitrary code execution or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important flaw in the Linux kernel\u0027s NFSv4.0 server (nfsd) allows a heap overflow. In this flaw a local attacker can trigger this by orchestrating two NFSv4.0 clients to create a conflicting lock with an oversized owner string.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-31402"
},
{
"category": "external",
"summary": "RHBZ#2454844",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454844"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-31402",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31402"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-31402",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31402"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026040327-CVE-2026-31402-3e6a@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026040327-CVE-2026-31402-3e6a@gregkh/T"
}
],
"release_date": "2026-04-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-05T10:20:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2026:13681"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache"
},
{
"cve": "CVE-2026-31431",
"cwe": {
"id": "CWE-1288",
"name": "Improper Validation of Consistency within Input"
},
"discovery_date": "2026-04-22T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2460538"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s algif_aead cryptographic algorithm interface. An incorrect \u0027in-place operation\u0027 was introduced, where the source and destination data mappings were different. This could lead to unexpected behavior or data integrity issues during cryptographic operations, potentially impacting the reliability of encrypted communications.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: crypto: algif_aead - Revert to operating out-of-place",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This local privilege escalation is rated as Important severity. Part of the Linux kernel\u0027s cryptographic interface contains an incorrect in-place operation, where source and destination data mappings differ. This could lead to data integrity issues, including the escalation to root privileges.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-31431"
},
{
"category": "external",
"summary": "RHBZ#2460538",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460538"
},
{
"category": "external",
"summary": "RHSB-2026-02",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-02"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-31431",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31431"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-31431",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31431"
},
{
"category": "external",
"summary": "https://access.redhat.com/articles/7141989",
"url": "https://access.redhat.com/articles/7141989"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7141931",
"url": "https://access.redhat.com/solutions/7141931"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7141979",
"url": "https://access.redhat.com/solutions/7141979"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7141990",
"url": "https://access.redhat.com/solutions/7141990"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7141996",
"url": "https://access.redhat.com/solutions/7141996"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7142032",
"url": "https://access.redhat.com/solutions/7142032"
},
{
"category": "external",
"summary": "https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/configuring-kernel-command-line-parameters_managing-monitoring-and-updating-the-kernel",
"url": "https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/configuring-kernel-command-line-parameters_managing-monitoring-and-updating-the-kernel"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/T"
},
{
"category": "external",
"summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
}
],
"release_date": "2026-04-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-05T10:20:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:13681"
},
{
"category": "workaround",
"details": "Individual articles, with specific advice, are available for a number of products:\n* Red Hat Enterprise Linux https://access.redhat.com/solutions/7141931\n* OpenShift 4 https://access.redhat.com/solutions/7141979\n* ROSA Classic and OpenShift Dedicated https://access.redhat.com/articles/7141989\n* ARO https://access.redhat.com/solutions/7141990\n* Advanced Cluster Management Governance Policy https://access.redhat.com/solutions/7142032\n* ROSA HCP: https://access.redhat.com/solutions/7141996\n\nGeneral guidance which is applicable to many products is below. Warning: there may be performance impacts for modifying functionality that uses kernel cryptographic functions. Though the affected module cannot be blacklisted, the affected functions themselves can be using the following boot arguments:\n```\ninitcall_blacklist=algif_aead_init\n```\n\nAlternatively, the af_alg interface itself can be blocked:\n```\ninitcall_blacklist=af_alg_init\n```\n\nAs a further alternative, the affected algorithm can be blocked:\n```\ninitcall_blacklist=crypto_authenc_esn_module_init\n```\n\nA mitigation that does not require a reboot using eBPF is available for Red Hat OpenShift Container Platform. This mitigation is only applicable to AMD64 nodes. Specific instructions are included in the linked articles.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "exploit_status",
"date": "2026-05-01T00:00:00+00:00",
"details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
},
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: crypto: algif_aead - Revert to operating out-of-place"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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