RHSA-2025:22800
Vulnerability from csaf_redhat - Published: 2025-12-08 03:01 - Updated: 2026-03-25 06:06Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Moderate
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 Moderate. 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: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required() (CVE-2023-53401)
* kernel: RDMA/rxe: Fix incomplete state save in rxe_requester (CVE-2023-53539)
* kernel: RDMA/rxe: Fix mr->map double free (CVE-2022-50543)
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 double-free vulnerability was found in the Linux kernel RDMA RXE (soft-RoCE) driver's memory region handling. A local user with access to RDMA userspace verbs can register a memory region with parameters that cause initialization to fail, triggering error handling code that frees the mr->map structure twice, which leads to memory corruption and can result in denial of service via kernel crash or potentially privilege escalation through heap manipulation.
7.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:22800
Workaround
To mitigate this issue, prevent the rdma_rxe module from loading. See https://access.redhat.com/solutions/41278 for instructions on blacklisting kernel modules.
A null pointer dereference exists in the linux kernel such that in obj_stock_flush_required():stock->cached_objcg can be reset between the check and dereference, resulting in damage to the availability of the system.
7.3 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:22800
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
An incorrect state restoration flaw was found in the Linux kernel's RDMA rxe (soft-RoCE) driver in the requester packet transmission logic. A local user with access to RDMA devices can trigger this issue when network layer packet drops occur during RDMA send operations, causing the work queue element state to be incompletely saved and restored. This results in data corruption in resent packets, leading to denial of service or potential data integrity issues.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:22800
Workaround
To mitigate this issue, prevent the rdma_rxe module from being loaded. See https://access.redhat.com/solutions/41278 for instructions on blacklisting kernel modules.
References
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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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"url": "https://access.redhat.com/security/cve/CVE-2023-53539"
},
{
"category": "external",
"summary": "RHBZ#2401510",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401510"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-53539",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-53539"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-53539",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53539"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025100443-CVE-2023-53539-4411@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025100443-CVE-2023-53539-4411@gregkh/T"
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{
"category": "vendor_fix",
"date": "2025-12-08T03:01:46+00:00",
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Sightings
| Author | Source | Type | Date |
|---|
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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