RHSA-2025:22087

Vulnerability from csaf_redhat - Published: 2025-11-25 16:42 - Updated: 2026-11-09 22:51
Summary
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 9.0 Update Services for SAP Solutions. 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: ALSA: usb-audio: Validate UAC3 power domain descriptors, too (CVE-2025-38729) * kernel: ALSA: usb-audio: Validate UAC3 cluster segment descriptors (CVE-2025-39757) * kernel: x86/vmscape: Add conditional IBPB mitigation (CVE-2025-40300) * kernel: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp (CVE-2023-53297) * kernel: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare (CVE-2025-39817) * kernel: cifs: fix oops during encryption (CVE-2022-50341) * kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report() (CVE-2023-53365) * kernel: RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device (CVE-2023-53393) * kernel: ext4: fix undefined behavior in bit shift for ext4_check_flag_values (CVE-2022-50403) 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.
CVE-2022-50341

An out-of-bounds memory access vulnerability exists in the linux kernel, such that A stack-allocated buffer (backed by vmalloc) was passed into crypto code (scatterwalk_map_and_copy() → __memcpy) where a cross-page write occurred. This ended up hitting a read-only mapping, causing a page-level fault and kernel panic (Oops: 9600004f), potentially damaging system availability and stability.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Product Identifier Version Remediation
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-0:5.14.0-70.155.1.rt21.227.el9_0.src —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-core-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-kvm-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-devel-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-kvm-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-modules-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.0.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-0:5.14.0-70.155.1.rt21.227.el9_0.src —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-core-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-devel-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-modules-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.0.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-70.155.1.rt21.227.el9_0.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2022-50403

A vulnerability was identified in the Linux kernel's ext4 filesystem implementation due to a flaw in how it processes filesystem metadata. An attacker with local privileges could create a malicious ext4 filesystem image to trigger this issue. When the system attempts to mount this malicious image, the kernel performs an incorrect calculation. This action results in unpredictable system behavior.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-190 - Integer Overflow or Wraparound
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2023-53297

A flaw was found in the Linux kernel's Bluetooth subsystem. This issue allows an adjacent attacker or local user with an active Bluetooth connection to cause a Denial of Service (DoS) by crashing the system. The vulnerability occurs due to improper lock management in the Logical Link Control and Adaptation Protocol (L2CAP) component, where an internal lock is released without being acquired during channel disconnection.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-832 - Unlock of a Resource that is not Locked
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2023-53365

A buffer underwrite vulnerability exists in the linux kernel in the function skb_under_panic in ip6mr_cache_report(), leading to an attacker, via crafting a payload, could result in damage to system availability and integrity.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-124 - Buffer Underwrite
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2023-53393

An out-of-bounds write vulnerability exists in the linux kernel, such that when mlx5_ib_get_hw_stats() is used forthe device (port_num = 0), There is a special handling in order to use the correct counters, but, port_num is being passed down the stack without any change leading to damage in system availability and integrity.

4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-787 - Out-of-bounds Write
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2025-38729

A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) USB audio subsystem. An attacker with physical access can connect a malicious USB Audio Class 3 (UAC3) device that provides a power-domain descriptor with an invalid length. Because the driver does not properly validate the descriptor length, it reads memory past the end of the buffer, which can cause a system crash resulting in a Denial of Service (DoS) or lead to unauthorized information disclosure.

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 - Out-of-bounds Read
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2025-39757

A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) USB audio driver. An attacker capable of attaching a malicious USB device or virtual hardware can supply malformed USB Audio Class 3 (UAC3) cluster segment descriptors. Because the driver does not properly validate descriptor sizes against buffer boundaries, this flaw leads to out-of-bounds memory access, resulting in a kernel crash and Denial of Service (DoS).

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-20 - Improper Input Validation
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2025-39817

A slab-out-of-bounds exists in the linux kernel in efivarfs_d_compare, such that the issue can be triggered by parallel lookups using an invalid filename due to an incorrect memcmp function.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
CVE-2025-40300

In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit. Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo. [ dhansen: elaborate on suboptimal IBPB solution ]

6.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE-402 - Transmission of Private Resources into a New Sphere
Affected products
Fixed 30 products, the same list as for CVE-2022-50341
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2025:22087 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2393164 external
https://bugzilla.redhat.com/show_bug.cgi?id=2394615 external
https://bugzilla.redhat.com/show_bug.cgi?id=2394627 external
https://bugzilla.redhat.com/show_bug.cgi?id=2395681 external
https://bugzilla.redhat.com/show_bug.cgi?id=2395805 external
https://bugzilla.redhat.com/show_bug.cgi?id=2395879 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396130 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396376 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396494 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2022-50341 self
https://bugzilla.redhat.com/show_bug.cgi?id=2395879 external
https://www.cve.org/CVERecord?id=CVE-2022-50341 external
https://nvd.nist.gov/vuln/detail/CVE-2022-50341 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2022-50403 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396494 external
https://www.cve.org/CVERecord?id=CVE-2022-50403 external
https://nvd.nist.gov/vuln/detail/CVE-2022-50403 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2023-53297 self
https://bugzilla.redhat.com/show_bug.cgi?id=2395681 external
https://www.cve.org/CVERecord?id=CVE-2023-53297 external
https://nvd.nist.gov/vuln/detail/CVE-2023-53297 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2023-53365 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396130 external
https://www.cve.org/CVERecord?id=CVE-2023-53365 external
https://nvd.nist.gov/vuln/detail/CVE-2023-53365 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2023-53393 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396376 external
https://www.cve.org/CVERecord?id=CVE-2023-53393 external
https://nvd.nist.gov/vuln/detail/CVE-2023-53393 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-38729 self
https://bugzilla.redhat.com/show_bug.cgi?id=2393164 external
https://www.cve.org/CVERecord?id=CVE-2025-38729 external
https://nvd.nist.gov/vuln/detail/CVE-2025-38729 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-39757 self
https://bugzilla.redhat.com/show_bug.cgi?id=2394615 external
https://www.cve.org/CVERecord?id=CVE-2025-39757 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39757 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-39817 self
https://bugzilla.redhat.com/show_bug.cgi?id=2395805 external
https://www.cve.org/CVERecord?id=CVE-2025-39817 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39817 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-40300 self
https://bugzilla.redhat.com/show_bug.cgi?id=2394627 external
https://www.cve.org/CVERecord?id=CVE-2025-40300 external
https://nvd.nist.gov/vuln/detail/CVE-2025-40300 external
https://lore.kernel.org/linux-cve-announce/202509… external
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          "text": "An out-of-bounds write vulnerability exists in the linux kernel, such that when mlx5_ib_get_hw_stats() is used forthe  device (port_num = 0),\nThere is a special handling in order to use the correct counters, but,\nport_num is being passed down the stack without any change leading to damage in system availability and integrity.",
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          "text": "kernel: RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device",
          "title": "Vulnerability summary"
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          "text": "A flaw in mlx5_ib_get_hw_stats() allowed port_num=0 (device-level query) to propagate down the stack, where code paths assumed port_num \u003e= 1, leading to a NULL-pointer dereference and kernel oops during stats collection or device registration. The fix normalizes device queries by forcing port_num=1 before accessing per-port data and removes an unused variable. Exploitation requires local, highly privileged access to the RDMA device stack (e.g., devlink/IB admin), and impact is limited to local DoS.",
          "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": "Vulnerability summary"
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          "text": "A malicious or malformed USB Audio Class 3.0 device could provide a power-domain descriptor with an invalid bLength, leading the usb-audio parser to read past the end of the buffer. The fix adds explicit length checks for UAC3 power domain descriptors to prevent OOB access.",
          "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": "Vulnerability summary"
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          "text": "This vulnerability is rated as Moderate severity rather than Low because an out-of-bounds memory access in kernel space can compromise system stability, though exposure is restricted by requiring physical insertion of a crafted USB device or the ability to attach virtualized hardware. In typical Red Hat Enterprise Linux environments, the sound subsystem automatically loads the relevant driver upon device connection. An attacker with access to attach such hardware could trigger this flaw using malformed audio descriptors, resulting in a kernel crash and denial of service.",
          "title": "Statement"
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          "summary": "https://lore.kernel.org/linux-cve-announce/2025091128-CVE-2025-40300-5569@gregkh/",
          "url": "https://lore.kernel.org/linux-cve-announce/2025091128-CVE-2025-40300-5569@gregkh/"
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      "title": "kernel: x86/vmscape: Add conditional IBPB mitigation"
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  ]
}



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