RHSA-2026:93437
Vulnerability from csaf_redhat - Published: 2026-11-02 01:51 - Updated: 2026-11-02 18:51Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 8.
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: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() (CVE-2026-63924)
* kernel: ipv6: exthdrs: refresh nh after handling HAO option (CVE-2026-63922)
* kernel: af_unix: Fix UAF read of tail->len in unix_stream_data_wait() (CVE-2026-64109)
* kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE (CVE-2026-72083)
* kernel: tipc: require net admin for TIPCv2 netlink mutators (CVE-2026-74283)
* kernel: smb: client: bound dirent name against end of SMB response in cifs_filldir (CVE-2026-93787)
* kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability ()
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 IPv6 extension header processing. When processing the Home Address Option (HAO), the cached network header pointer may become invalid if the packet's memory is reallocated. This can lead to incorrect parsing of subsequent IPv6 Type-Length-Value (TLV) options, potentially causing unexpected network behavior or a denial of service.
7.0 (High)
Affected products
Fixed
30 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.181.1.rt7.522.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-kvm-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-kvm-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.181.1.rt7.522.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.181.1.rt7.522.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in the Linux kernel's handling of IPv6 extended headers. Specifically, the `ipv6_hop_jumbo()` function, which processes jumbo payloads, can modify internal packet buffer (skb) pointers. However, the network header (nh) pointer is not recomputed after these modifications. This oversight could lead to incorrect data processing, potentially causing system instability or a denial of service (DoS) due to malformed packets.
7.0 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-63922
Threats
Impact
Important
A flaw was found in the Linux kernel's af_unix (UNIX domain sockets) component. A race condition in the unix_stream_data_wait() function allows a local attacker to trigger a Use-After-Free (UAF) vulnerability. This occurs because the function peeks at a socket buffer without proper locking, enabling another thread to free the buffer while it is still being referenced. Successful exploitation of this UAF could lead to system instability or potentially information disclosure.
4.7 (Medium)
Affected products
Fixed
30 products, the same list as for
CVE-2026-63922
Threats
Impact
Moderate
A flaw was found in the Linux kernel's iSCSI target core. This use-after-free vulnerability occurs in the `core_scsi3_emulate_pro_register_and_move()` function. When processing iSCSI TransportIDs, a memory buffer is prematurely unmapped while still being referenced, particularly when the parameter list spans multiple pages. An attacker could potentially exploit this to cause a system crash, leading to a denial of service.
8.8 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-63922
Threats
Impact
Important
A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) version 2 component. This vulnerability allows a local unprivileged attacker to bypass administrative permission checks when performing network link operations. Consequently, the attacker can modify critical TIPC network configurations, such as network and node identities, manage key material, and control UDP bearers. This unauthorized access could lead to significant disruption or compromise of network communication.
7.3 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-63922
Threats
Impact
Moderate
A flaw was found in the Linux kernel's SMB (Server Message Block) client subsystem. When a user lists files in a directory on a mounted share, a malicious SMB server can return a crafted directory entry with an oversized filename length. Because the client fails to verify that the filename remains within the response buffer, the kernel reads beyond the allocated memory boundaries, leading to a system crash and denial of service (DoS) or potential disclosure of sensitive memory contents.
8.1 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-63922
Threats
Impact
Important
References
41 references
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"text": "A flaw was found in the Linux kernel\u0027s IPv6 extension header processing. When processing the Home Address Option (HAO), the cached network header pointer may become invalid if the packet\u0027s memory is reallocated. This can lead to incorrect parsing of subsequent IPv6 Type-Length-Value (TLV) options, potentially causing unexpected network behavior or a denial of service.",
"title": "Vulnerability description"
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{
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},
{
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{
"category": "external",
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{
"category": "external",
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{
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"text": "A flaw was found in the Linux kernel\u0027s af_unix (UNIX domain sockets) component. A race condition in the unix_stream_data_wait() function allows a local attacker to trigger a Use-After-Free (UAF) vulnerability. This occurs because the function peeks at a socket buffer without proper locking, enabling another thread to free the buffer while it is still being referenced. Successful exploitation of this UAF could lead to system instability or potentially information disclosure.",
"title": "Vulnerability description"
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{
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"text": "kernel: af_unix: Fix UAF read of tail-\u003elen in unix_stream_data_wait()",
"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.",
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{
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"text": "A flaw was found in the Linux kernel\u0027s iSCSI target core. This use-after-free vulnerability occurs in the `core_scsi3_emulate_pro_register_and_move()` function. When processing iSCSI TransportIDs, a memory buffer is prematurely unmapped while still being referenced, particularly when the parameter list spans multiple pages. An attacker could potentially exploit this to cause a system crash, leading to a denial of service.",
"title": "Vulnerability description"
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{
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"text": "kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE",
"title": "Vulnerability summary"
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"text": "This vulnerability is rated as Important severity because an authenticated remote client can trigger a kernel-level use-after-free condition on an exposed storage target, potentially causing a system crash or privilege escalation. Under default Red Hat Enterprise Linux installations, the kernel LIO SCSI target framework is inactive unless administrators explicitly configure the system to serve block storage over iSCSI. Consequently, hosts acting exclusively as storage initiators or standard servers without active SCSI target configurations remain unexposed to this flaw.",
"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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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Transparent Inter-Process Communication (TIPC) version 2 component. This vulnerability allows a local unprivileged attacker to bypass administrative permission checks when performing network link operations. Consequently, the attacker can modify critical TIPC network configurations, such as network and node identities, manage key material, and control UDP bearers. This unauthorized access could lead to significant disruption or compromise of network communication.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tipc: require net admin for TIPCv2 netlink mutators",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "TIPCv2 generic netlink mutating operations were registered without the administrative permission flags required to enforce the expected `CAP_NET_ADMIN` authorization check. As a result, a local unprivileged process with no effective capabilities can invoke administrative TIPC operations that should only be available to a network administrator. Confirmed affected operations include modification of the TIPC network and node configuration, bearer enable/disable and configuration, link and monitor settings, peer removal, and setting or flushing TIPC key material.\n\nThe vulnerable entry point is the local generic netlink control interface and is therefore not directly reachable through network traffic. For CVSS, `AV:L` and `PR:L` reflect that an attacker requires local code execution or an equivalent unprivileged local process context, but does not require root privileges or `CAP_NET_ADMIN`. Practical impact also depends on TIPC being available and having a relevant configuration on the affected system.\n\nThis represents a TIPC-specific privilege-boundary bypass rather than a general kernel privilege escalation. Successful exploitation does not grant the attacker root access or arbitrary `CAP_NET_ADMIN` functionality; instead, it exposes a defined set of TIPC administrative mutators without their intended authorization checks. Nevertheless, these operations can significantly alter TIPC state, including network identity, bearer and link configuration, peer state, monitoring configuration, and cryptographic key material.\n\nThe direct impact is primarily to integrity and availability. An attacker can make unauthorized changes to TIPC configuration, disable or enable bearers, remove peers, flush or replace key material, and otherwise disrupt TIPC or cluster communication. High integrity and availability impact are therefore defensible where TIPC is actively used. Confidentiality impact is less direct because the vulnerability does not itself disclose existing keys, kernel memory, or protected data. Any confidentiality impact would depend on additional consequences of manipulating the TIPC configuration and is more appropriately considered in a paranoid assessment.",
"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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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-74283"
},
{
"category": "external",
"summary": "RHBZ#2516935",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516935"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-74283",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-74283"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-74283",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74283"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026081546-CVE-2026-74283-7822@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026081546-CVE-2026-74283-7822@gregkh/T"
}
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"release_date": "2026-08-15T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-11-02T01:51:41+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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{
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"title": "Vulnerability description"
},
{
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"text": "kernel: smb: client: bound dirent name against end of SMB response in cifs_filldir",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Important severity because an untrusted remote server can trigger an out-of-bounds kernel read, potentially causing a system crash or exposing sensitive kernel slab data to unprivileged callers. Under default Red Hat Enterprise Linux configurations, CIFS/SMB shares are not automatically mounted, restricting exposure to environments where client systems explicitly connect to external file servers. Exploitation requires a user or service to list contents on a directory mounted via the legacy SMB1 protocol, which is not used by default in modern enterprise deployments unless explicitly requested.",
"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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"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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.