RHSA-2026:72628
Vulnerability from csaf_redhat - Published: 2026-09-28 18:10 - Updated: 2026-09-28 22:23Summary
Red Hat Security Advisory: kpatch-patch-5_14_0-284_134_1, kpatch-patch-5_14_0-284_148_1, kpatch-patch-5_14_0-284_158_1, kpatch-patch-5_14_0-284_172_1, and kpatch-patch-5_14_0-284_188_1 security update
Severity
Important
Notes
Topic: An update for multiple packages is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
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: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-284.134.1.el9_2.
Security Fix(es):
* kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path (CVE-2026-46189)
* kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res->rt6 pointer (CVE-2026-74581)
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, specifically within the RDMA (Remote Direct Memory Access) vmw_pvrdma module. This vulnerability is a double free, which means the system attempts to release the same memory resource twice. This can occur in an error handling path within the `pvrdma_alloc_ucontext()` function. Exploiting this flaw could lead to memory corruption or cause the system to become unavailable, resulting in a denial of service (DoS).
7.0 (High)
Affected products
Fixed
35 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-0:1-16.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-0:1-16.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-0:1-16.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-debuginfo-0:1-16.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-debuginfo-0:1-16.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-debugsource-0:1-16.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_134_1-debugsource-0:1-16.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-0:1-14.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-0:1-14.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-0:1-14.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-debuginfo-0:1-14.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-debuginfo-0:1-14.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-debugsource-0:1-14.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_148_1-debugsource-0:1-14.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-0:1-12.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-0:1-12.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-0:1-12.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-debuginfo-0:1-12.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-debuginfo-0:1-12.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-debugsource-0:1-12.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_158_1-debugsource-0:1-12.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-0:1-9.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-0:1-9.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-0:1-9.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-debuginfo-0:1-9.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-debuginfo-0:1-9.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-debugsource-0:1-9.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_172_1-debugsource-0:1-9.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-0:1-1.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-0:1-1.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-0:1-1.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-debuginfo-0:1-1.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-debuginfo-0:1-1.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-debugsource-0:1-1.el9_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S:kpatch-patch-5_14_0-284_188_1-debugsource-0:1-1.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A use-after-free vulnerability was found in the Linux kernel's IPv6 FIB rule lookup path. In fib6_rule_suppress(), when a route is suppressed and released via ip6_rt_put_flags(), the res->rt6 pointer is not cleared. If no later rule supplies a replacement route, fib6_rule_lookup() returns the stale (freed) rt6_info to its caller. The subsequent dst_release() then operates on freed memory, hitting rcuref_put_slowpath(). A local attacker who can configure IPv6 routing/FIB rules could trigger this to cause a denial of service (kernel crash) or potentially escalate privileges.
7.8 (High)
Affected products
Fixed
35 products, the same list as for
CVE-2026-46189
Threats
Impact
Important
References
15 references
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"text": "kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path",
"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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"title": "kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path"
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{
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"ids": [
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{
"category": "description",
"text": "A use-after-free vulnerability was found in the Linux kernel\u0027s IPv6 FIB rule lookup path. In fib6_rule_suppress(), when a route is suppressed and released via ip6_rt_put_flags(), the res-\u003ert6 pointer is not cleared. If no later rule supplies a replacement route, fib6_rule_lookup() returns the stale (freed) rt6_info to its caller. The subsequent dst_release() then operates on freed memory, hitting rcuref_put_slowpath(). A local attacker who can configure IPv6 routing/FIB rules could trigger this to cause a denial of service (kernel crash) or potentially escalate privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer",
"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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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520980"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-74581"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-74581",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74581"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6aea62e433fe1b586202a5fee8b5807ce635e1d7",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6aea62e433fe1b586202a5fee8b5807ce635e1d7"
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{
"category": "vendor_fix",
"date": "2026-09-28T18:10:00+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",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:72628"
},
{
"category": "workaround",
"details": "To mitigate this issue, disable the `ipv6` kernel module at boot using the kernel command-line parameter:\n\n```\ngrubby --update-kernel=ALL --args=\"ipv6.disable=1\"\n```\n\nA reboot is required for this change to take effect. To verify after reboot:\n\n```\ncat /proc/cmdline | grep -o ipv6.disable=1\nsysctl net.ipv6.conf.all.disable_ipv6\n```\n\nApplications or services that rely on the IPv6 protocol cannot use this mitigation and should prioritize applying the fix.",
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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: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer"
}
]
}
Loading…
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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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