RHSA-2026:22964
Vulnerability from csaf_redhat - Published: 2026-06-04 15:52 - Updated: 2026-08-31 17:15Summary
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: nvme: avoid double free special payload (CVE-2024-41073)
* kernel: net: use dst_dev_rcu() in sk_setup_caps() (CVE-2025-40170)
* kernel: ipv6: use RCU in ip6_xmit() (CVE-2025-40135)
* kernel: ipv6: use RCU in ip6_output() (CVE-2025-40158)
* kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (CVE-2026-23216)
* kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)
* kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)
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's NVMe component. This vulnerability is due to a double free error that occurs when a discard request needs to be retried and fails before a new special payload is added. A local attacker could exploit this memory corruption issue to cause a denial of service (DoS).
5.5 (Medium)
Affected products
Fixed
72 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.145.1.el8_8.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-abi-stablelists-0:4.18.0-477.145.1.el8_8.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-core-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-core-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-core-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-core-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-devel-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-devel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-modules-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-modules-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-modules-extra-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debug-modules-extra-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debuginfo-common-ppc64le-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-debuginfo-common-x86_64-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-devel-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-devel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-doc-0:4.18.0-477.145.1.el8_8.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-modules-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
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| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-modules-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
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|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-modules-extra-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-modules-extra-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-libs-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kernel-tools-libs-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
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| Unresolved product id: BaseOS-8.8.0.Z.E4S:perf-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:perf-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:perf-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:perf-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-perf-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-perf-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-perf-debuginfo-0:4.18.0-477.145.1.el8_8.ppc64le | — |
Vendor Fix
fix
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|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-perf-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
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| Unresolved product id: BaseOS-8.8.0.Z.TUS:bpftool-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
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|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:bpftool-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-0:4.18.0-477.145.1.el8_8.src | — |
Vendor Fix
fix
|
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| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-abi-stablelists-0:4.18.0-477.145.1.el8_8.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-core-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-core-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-devel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-modules-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debug-modules-extra-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-debuginfo-common-x86_64-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-devel-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-doc-0:4.18.0-477.145.1.el8_8.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-modules-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-modules-extra-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-tools-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-tools-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:kernel-tools-libs-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:perf-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:perf-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python3-perf-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python3-perf-debuginfo-0:4.18.0-477.145.1.el8_8.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A use-after-free flaw was found in ip6_autoflowlabel in the Linux kernel's net/ipv6/ip6_output.c code. In this flaw an attacker can cause a denial of service (DoS) attack.
7.0 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Moderate
A use-after-free flaw was found in ip6_finish_output2 in net/ipv6/ip6_output.c in ipv6 access. This flaw could allow an attacker to crash the system at device disconnect. This vulnerability could even lead to a kernel information leak problem.
7.0 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Moderate
In the Linux kernel, the following vulnerability has been resolved: net: use dst_dev_rcu() in sk_setup_caps() Use RCU to protect accesses to dst->dev from sk_setup_caps() and sk_dst_gso_max_size(). Also use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(), and ip_dst_mtu_maybe_forward(). ip4_dst_hoplimit() can use dst_dev_net_rcu().
7.4 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Moderate
A use-after-free flaw was found in the Linux kernel's iSCSI target subsystem. In the iscsit_dec_conn_usage_count() function, complete() is called while still holding the conn->conn_usage_lock spinlock. The waiting thread (such as iscsit_close_connection()) may wake up immediately and free the iscsit_conn structure before the current thread executes spin_unlock_bh(), resulting in a use-after-free when attempting to release the lock on already-freed memory.
7.0 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Moderate
A flaw was found in the Linux kernel's IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel's IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash (denial of service) or potentially allow arbitrary code execution with kernel privileges.
8.8 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Critical
A flaw was found in the Linux kernel's IPv6 ICMP error generation. A remote attacker could send a specially crafted IPv4 ICMP error packet with a Common Internet Protocol Security Option (CIPSO) IP option. This could lead to incorrect handling of packet control block data when generating an IPv6 ICMP error, potentially causing an out-of-bounds memory access. This memory corruption could result in information disclosure or a denial of service.
7.3 (High)
Affected products
Fixed
72 products, the same list as for
CVE-2024-41073
Threats
Impact
Important
References
45 references
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"name": "Multiple Releases of Same Resource or Handle"
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"text": "2301637"
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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s NVMe component. This vulnerability is due to a double free error that occurs when a discard request needs to be retried and fails before a new special payload is added. A local attacker could exploit this memory corruption issue to cause a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: nvme: avoid double free special payload",
"title": "Vulnerability summary"
},
{
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-41073"
},
{
"category": "external",
"summary": "RHBZ#2301637",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2301637"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-41073",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-41073"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-41073",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41073"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2024072909-CVE-2024-41073-1fb9@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2024072909-CVE-2024-41073-1fb9@gregkh/T"
}
],
"release_date": "2024-07-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: nvme: avoid double free special payload"
},
{
"cve": "CVE-2025-40135",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-11-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2414521"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in ip6_autoflowlabel in the Linux kernel\u0027s net/ipv6/ip6_output.c code. In this flaw an attacker can cause a denial of service (DoS) attack.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ipv6: use RCU in ip6_xmit()",
"title": "Vulnerability summary"
},
{
"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-2025-40135"
},
{
"category": "external",
"summary": "RHBZ#2414521",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414521"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40135",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40135"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40135",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40135"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025111255-CVE-2025-40135-67ca@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025111255-CVE-2025-40135-67ca@gregkh/T"
}
],
"release_date": "2025-11-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
},
{
"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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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/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: ipv6: use RCU in ip6_xmit()"
},
{
"cve": "CVE-2025-40158",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-11-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2414523"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in ip6_finish_output2 in net/ipv6/ip6_output.c in ipv6 access. This flaw could allow an attacker to crash the system at device disconnect. This vulnerability could even lead to a kernel information leak problem.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ipv6: use RCU in ip6_output()",
"title": "Vulnerability summary"
},
{
"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-2025-40158"
},
{
"category": "external",
"summary": "RHBZ#2414523",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414523"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40158",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40158"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40158",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40158"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025111258-CVE-2025-40158-4c9d@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025111258-CVE-2025-40158-4c9d@gregkh/T"
}
],
"release_date": "2025-11-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
},
{
"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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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/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: ipv6: use RCU in ip6_output()"
},
{
"cve": "CVE-2025-40170",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-11-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2414506"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: use dst_dev_rcu() in sk_setup_caps()\n\nUse RCU to protect accesses to dst-\u003edev from sk_setup_caps()\nand sk_dst_gso_max_size().\n\nAlso use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(),\nand ip_dst_mtu_maybe_forward().\n\nip4_dst_hoplimit() can use dst_dev_net_rcu().",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: use dst_dev_rcu() in sk_setup_caps()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Several paths read dst-\u003edev without RCU. A concurrent dst/device teardown could cause a use-after-free\u2014fixed by switching to dst_dev_rcu() and wrapping sections in rcu_read_lock(), mitigating a local DoS/LPE risk.\nA local user floods route changes (device up/down, MTU/GSO tweaks, dst churn) while rapidly creating sockets, racing sk_setup_caps() to read dev after free that leads to kernel crash.",
"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-2025-40170"
},
{
"category": "external",
"summary": "RHBZ#2414506",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414506"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40170",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40170"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40170",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40170"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025111259-CVE-2025-40170-d39d@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025111259-CVE-2025-40170-d39d@gregkh/T"
}
],
"release_date": "2025-11-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: net: use dst_dev_rcu() in sk_setup_caps()"
},
{
"cve": "CVE-2026-23216",
"cwe": {
"id": "CWE-413",
"name": "Improper Resource Locking"
},
"discovery_date": "2026-02-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2440630"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in the Linux kernel\u0027s iSCSI target subsystem. In the iscsit_dec_conn_usage_count() function, complete() is called while still holding the conn-\u003econn_usage_lock spinlock. The waiting thread (such as iscsit_close_connection()) may wake up immediately and free the iscsit_conn structure before the current thread executes spin_unlock_bh(), resulting in a use-after-free when attempting to release the lock on already-freed memory.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability requires the iSCSI target subsystem to be configured and in use, which limits the attack surface to systems actively serving as iSCSI targets. The race condition is timing-dependent and requires specific connection teardown sequences to trigger. Successful exploitation could lead to kernel crash or potentially memory corruption.",
"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-2026-23216"
},
{
"category": "external",
"summary": "RHBZ#2440630",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440630"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23216",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23216"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23216",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23216"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026021800-CVE-2026-23216-6c63@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026021800-CVE-2026-23216-6c63@gregkh/T"
}
],
"release_date": "2026-02-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent the iscsi_target_mod module from being loaded. See https://access.redhat.com/solutions/41278 for instructions on how to blacklist kernel modules.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/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_conn_usage_count()"
},
{
"cve": "CVE-2026-43037",
"cwe": {
"id": "CWE-843",
"name": "Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)"
},
"discovery_date": "2026-05-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464351"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel\u0027s IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash (denial of service) or potentially allow arbitrary code execution with kernel privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Critical flaw in the Linux kernel\u0027s IPv6 tunneling error handling can lead to a stack buffer overflow. An unauthenticated remote attacker could exploit this by sending specially crafted network packets, potentially resulting in a denial of service or information disclosure on affected Red Hat Enterprise Linux systems.",
"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-2026-43037"
},
{
"category": "external",
"summary": "RHBZ#2464351",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464351"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43037",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43037"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43037",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43037"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43037-0346@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43037-0346@gregkh/T"
}
],
"release_date": "2026-05-01T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
},
{
"category": "workaround",
"details": "Mitigation for this issue is to skip loading the affected module `ip6_tunnel` onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time.\n~~~\nHow do I blacklist a kernel module to prevent it from loading automatically? \nhttps://access.redhat.com/solutions/41278 \n~~~\n\nWe may also want to detection and monitoring an affected system as below:\n~~~\nMonitor for exploitation attempts:\n\n# Enable kernel audit for IPv6 tunnel operations\nauditctl -a always,exit -F arch=b64 -S socket -F a0=10 -F a1=3 -k ipv6_tunnel\n\n# Monitor system logs for kernel panics/crashes\njournalctl -k -p err -f | grep -i \"ip6_tunnel\\|icmp\\|stack\"\n~~~",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/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": "Critical"
}
],
"title": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()"
},
{
"cve": "CVE-2026-43038",
"cwe": {
"id": "CWE-843",
"name": "Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)"
},
"discovery_date": "2026-05-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464397"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s IPv6 ICMP error generation. A remote attacker could send a specially crafted IPv4 ICMP error packet with a Common Internet Protocol Security Option (CIPSO) IP option. This could lead to incorrect handling of packet control block data when generating an IPv6 ICMP error, potentially causing an out-of-bounds memory access. This memory corruption could result in information disclosure or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach()",
"title": "Vulnerability summary"
},
{
"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-2026-43038"
},
{
"category": "external",
"summary": "RHBZ#2464397",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464397"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43038",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43038"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43038",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43038"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050103-CVE-2026-43038-b591@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050103-CVE-2026-43038-b591@gregkh/T"
}
],
"release_date": "2026-05-01T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-04T15:52:35+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-2026:22964"
},
{
"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": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: ipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach()"
}
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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