RHSA-2026:6948
Vulnerability from csaf_redhat - Published: 2026-04-08 00:16 - Updated: 2026-04-13 07:08Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Low
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 Low. 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 kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180)
* kernel: Kernel: Double free vulnerability in exFAT filesystem can lead to denial of service (CVE-2025-38206)
* kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)
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 Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.
7.1 (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-2026:6948
A flaw was found in the Linux kernel's exFAT filesystem driver. A local attacker with low privileges could exploit a double free vulnerability within the `delayed_free` function. This memory corruption flaw can lead to a denial of service (DoS), potentially causing system instability or crashes. It may also result in information disclosure.
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-2026:6948
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u
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-2026:6948
Workaround
To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
References
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"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.",
"title": "Vulnerability description"
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{
"category": "summary",
"text": "kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate: A Use-After-Free vulnerability in the Linux kernel\u0027s Asynchronous Transfer Mode (ATM) subsystem allows an authenticated local attacker to cause a denial of service or a leak in kernel internal information. This flaw affects Red Hat Enterprise Linux 7, 8, and 9. Exploitation requires the ATM subsystem to be active, which is not enabled by default in typical Red Hat Enterprise Linux installations.",
"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": "external",
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{
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},
{
"category": "external",
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{
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"text": "A flaw was found in the Linux kernel\u0027s exFAT filesystem driver. A local attacker with low privileges could exploit a double free vulnerability within the `delayed_free` function. This memory corruption flaw can lead to a denial of service (DoS), potentially causing system instability or crashes. It may also result in information disclosure.",
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{
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"text": "This Moderate impact double free vulnerability in the Linux kernel\u0027s exFAT filesystem driver affects Red Hat Enterprise Linux 9 and 10. A local attacker with a special group privileges could exploit this flaw, leading to a denial of service, system instability, or crashes.",
"title": "Statement"
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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": "kernel: macvlan: fix possible UAF in macvlan_forward_source()"
}
]
}
Loading…
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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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