RHSA-2026:77214
Vulnerability from csaf_redhat - Published: 2026-10-07 03:07 - Updated: 2026-10-07 10:26Summary
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for kernel-rt 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: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: linux/dim: Fix divide by 0 in RDMA DIM (CVE-2022-49670)
* kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
* kernel: ip6_gre: Use cached t->net in ip6erspan_changelink() (CVE-2026-46120)
* kernel: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
* kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
* kernel: ice: fix double-free of tx_buf skb (CVE-2026-53009)
* kernel: zram: fix use-after-free in zram_bvec_write_partial() (CVE-2026-53185)
* kernel: i2c: stub: Reject I2C block transfers with invalid length (CVE-2026-64191)
* kernel: net: qrtr: restrict socket creation to the initial network namespace (CVE-2026-68294)
* kernel: netfilter: flowtable: publish GC-visible tuple last (CVE-2026-74746)
Bug Fix(es) and Enhancement(s):
* RT scheduler livelock: migrate-disabled task at pushable-list head causes repeated RT push/stopper retries, starving a critical RT task (remaining issue after CVE-2026-45919 fix in 94894c9c477e) (JIRA:RHEL-257978)
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 Remote Direct Memory Access (RDMA) subsystem. A divide-by-zero error can occur within the Dynamic Interrupt Moderation (DIM) mechanism when comparing statistics that evaluate to a zero value. A local attacker can trigger this issue during network operations to crash the system, resulting in a Denial of Service (DoS).
5.5 (Medium)
Affected products
Fixed
34 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.195.1.rt14.480.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-kvm-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-kvm-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.195.1.rt14.480.el9_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.195.1.rt14.480.el9_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the Linux kernel's ALSA 6fire USB audio device driver. During the disconnection process of a 6fire USB audio device, a use-after-free vulnerability occurs. This happens when the system attempts to write to memory that has already been deallocated, which can lead to memory corruption and potentially cause system instability or a denial of service.
6.3 (Medium)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Moderate
A flaw was found in the Linux kernel's ip6_gre module. An unprivileged user could exploit this vulnerability by migrating a network device, causing the ip6erspan_changelink() function to incorrectly handle network namespace references. This error leads to a use-after-free condition when the original network namespace is destroyed, potentially resulting in a kernel bug and system instability or denial of service.
7.1 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Moderate
A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. This vulnerability, a use-after-free, occurs when the system processes a Stale Cookie ERROR during the setup or reconfiguration of an SCTP association. A remote attacker could exploit this by sending specially crafted SCTP packets. This could lead to a system crash, causing a Denial of Service (DoS).
8.8 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Important
A flaw was found in the Linux kernel's netfilter conntrack module. This vulnerability arises from the use of `sprintf` and insufficient buffer sizing in the `mangle_content_len()` function, which can lead to a stack-out-of-bounds write. An attacker could potentially exploit this memory corruption issue to cause a denial of service or other unspecified impacts.
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Important
A flaw was found in the Linux kernel's ice network driver. An error in the driver's handling of network packet transmission, specifically when ice_tso() or ice_tx_csum() functions fail, can lead to a double-free of a network buffer (skb). This occurs because a transmit buffer (tx_buf) may still point to an already freed buffer. If the network interface is subsequently brought down, this double-free can be triggered, potentially leading to a system crash or denial of service (DoS).
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Moderate
A flaw was found in the Linux kernel, specifically within the zram module. This vulnerability is a use-after-free error, where the system attempts to use a piece of memory after it has been freed. This occurs when the `zram_bvec_write_partial()` function allows an asynchronous read to write into a page that has already been deallocated. Such a flaw can lead to system instability, causing crashes, or in some scenarios, could be exploited by a local attacker to escalate privileges or execute arbitrary code.
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Moderate
A flaw was found in the Linux kernel's `i2c-stub` driver. A local user with access to the `/dev/i2c-*` device can exploit this vulnerability by issuing an I2C System Management Bus (SMBus) input/output control (ioctl) command with a specially crafted block transfer length. This invalid length can cause the driver to read or write beyond the allocated buffer, leading to a stack-out-of-bounds error and a system crash, resulting in a Denial of Service (DoS).
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Important
A flaw was found in the Linux kernel's QRTR (Qualcomm IPC Router) networking component. An unprivileged local attacker can create a QRTR socket in a separate network namespace. Due to improper handling of global state variables, this allows the attacker to send datagrams and control-plane messages to QRTR sockets in other network namespaces. This bypasses network namespace isolation, enabling unauthorized communication and potential information disclosure between isolated network environments.
7.3 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Important
A flaw was found in the netfilter flowtable component of the Linux kernel. This vulnerability occurs due to a timing issue where the system's garbage collection can free a network flow while it is still being set up. This can lead to a 'use-after-free' condition, where the system attempts to access memory that has already been released. This memory corruption could potentially result in a system crash (denial of service) or, in certain circumstances, allow for arbitrary code execution.
7.8 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2022-49670
Threats
Impact
Important
References
63 references
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"text": "A flaw was found in the Linux kernel\u0027s ALSA 6fire USB audio device driver. During the disconnection process of a 6fire USB audio device, a use-after-free vulnerability occurs. This happens when the system attempts to write to memory that has already been deallocated, which can lead to memory corruption and potentially cause system instability or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ALSA: 6fire: fix use-after-free on disconnect",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The 6fire USB audio disconnect path could touch freed memory; upstream hardens teardown ordering. Red Hat customers using this rare interface should update kernels. Optional mitigation is unloading the 6fire ALSA USB driver module where unused.",
"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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"date": "2026-10-07T03:07:40+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An Important flaw was found in the Linux kernel\u0027s netfilter conntrack helper for SIP. A local attacker with low privileges could trigger a stack-out-of-bounds write by sending specially crafted SIP messages, potentially leading to a denial of service or privilege escalation. This vulnerability requires the system to process SIP traffic through netfilter.",
"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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{
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"date": "2026-10-07T03:07:40+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"text": "kernel: zram: fix use-after-free in zram_bvec_write_partial()",
"title": "Vulnerability summary"
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"text": "A use-after-free write can occur in zram_bvec_write_partial() when zram_read_page() is called with a parent bio and selects the asynchronous backing device read path for ZRAM_WB slots. The function can return while the read bio is still in flight, after which the caller updates the temporary page, writes it back, and frees it. The pending asynchronous read may then complete into the freed page, causing kernel memory corruption. For the CVSS the PR:L is used because triggering can be possible from a local user context once zram writeback is configured, for example through swap or block I/O activity, even though initial writeback setup is usually administrative.",
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"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.",
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"title": "Vulnerability summary"
},
{
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"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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"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.",
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-74746"
},
{
"category": "external",
"summary": "RHBZ#2524483",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524483"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-74746",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-74746"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-74746",
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},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026082658-CVE-2026-74746-c2f9@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026082658-CVE-2026-74746-c2f9@gregkh/T"
}
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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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