RHSA-2025:22124
Vulnerability from csaf_redhat - Published: 2025-11-25 18:17 - Updated: 2026-03-13 01:10Summary
Red Hat Security Advisory: kernel-rt security update
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 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: net/sched: act_ct: fix skb leak and crash on ooo frags (CVE-2023-52610)
* kernel: smb: client: fix potential UAF in cifs_stats_proc_write() (CVE-2024-35868)
* kernel: ethtool: check device is present when getting link settings (CVE-2024-46679)
* kernel: ALSA: usb-audio: Validate UAC3 power domain descriptors, too (CVE-2025-38729)
* kernel: ipv6: sr: Fix MAC comparison to be constant-time (CVE-2025-39702)
* kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730)
* kernel: ALSA: usb-audio: Validate UAC3 cluster segment descriptors (CVE-2025-39757)
* kernel: x86/vmscape: Add conditional IBPB mitigation (CVE-2025-40300)
* kernel: wifi: mac80211: check S1G action frame size (CVE-2023-53257)
* 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: ip6mr: Fix skb_under_panic in ip6mr_cache_report() (CVE-2023-53365)
* kernel: Bluetooth: L2CAP: Fix user-after-free (CVE-2022-50386)
* kernel: nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)
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.
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"cve": "CVE-2022-50386",
"discovery_date": "2025-09-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2396431"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix user-after-free\n\nThis uses l2cap_chan_hold_unless_zero() after calling\n__l2cap_get_chan_blah() to prevent the following trace:\n\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\n*kref)\nBluetooth: chan 0000000023c4974d\nBluetooth: parent 00000000ae861c08\n==================================================================\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\nkernel/locking/mutex.c:191 [inline]\nBUG: KASAN: use-after-free in __mutex_lock_common\nkernel/locking/mutex.c:671 [inline]\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\nkernel/locking/mutex.c:729\nRead of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Bluetooth: L2CAP: Fix user-after-free",
"title": "Vulnerability summary"
},
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"text": "A use-after-free in the Bluetooth L2CAP subsystem could occur when handling channel responses in l2cap_connect_create_rsp(), due to missing reference checks. This condition can be triggered during race conditions between channel creation and teardown, leading to kernel crashes. Exploitation is most practical as a local or adjacent denial of service over Bluetooth.\n\nL2CAP underpins many Bluetooth profiles and services (BLE ATT/GATT, RFCOMM, A2DP/AVRCP, HID, PAN, SDP, OBEX, etc.). Any profile that creates logical L2CAP channels may be involved. Common real-world triggers include BLE GATT interactions, audio profiles, HID devices, and tethering/PAN connections.\n\nAn attacker within radio range can attempt to repeatedly open/close or otherwise race L2CAP channels to increase likelihood of the race (fast connect/disconnect storms or parallel requests).\n\nMost realistic impact is a local/adjacent attacker (in Bluetooth radio range) who can actively interact with the target Bluetooth stack.\n\nThe CIA=HHH for CVSS is a conservative/precautionary assessment. In practical terms, successful privilege escalation or remote compromise is unlikely but theoretically possible: to do so an attacker would need to craft a sequence that causes controlled memory corruption and further exploit kernel memory layout \u2014 substantially harder than causing a crash.",
"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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{
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{
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{
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"text": "A memory leak flaw and potential kernel crash were found in the Linux kernel\u2019s Conntrack module. This issue occurs when Conntrack is being used by a local user for a specific configuration, and both fragmented packets are received remotely and out of order. This flaw allows a local or remote user to crash or potentially escalate their privileges on the system.",
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"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.",
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: check S1G action frame size\n\nBefore checking the action code, check that it even\nexists in the frame.",
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{
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"text": "kernel: wifi: mac80211: check S1G action frame size",
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"text": "Exploitable by an RF-adjacent attacker via malformed 802.11ah (S1G) action frames. No local privileges required. Impact is limited to potential denial-of-service from a kernel crash. Not applicable where 802.11ah/S1G is not in use.\nFixed starting from the Red Hat Enterprise Linux 9.4.",
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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": "external",
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{
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},
{
"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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"title": "Vulnerability description"
},
{
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"text": "kernel: smb: client: fix potential UAF in cifs_stats_proc_write()",
"title": "Vulnerability summary"
},
{
"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.",
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"title": "kernel: ethtool: check device is present when getting link settings"
},
{
"cve": "CVE-2025-38729",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
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{
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"text": "2393164"
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Validate UAC3 power domain descriptors, too\n\nUAC3 power domain descriptors need to be verified with its variable\nbLength for avoiding the unexpected OOB accesses by malicious\nfirmware, too.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ALSA: usb-audio: Validate UAC3 power domain descriptors, too",
"title": "Vulnerability summary"
},
{
"category": "other",
"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"
},
{
"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",
"summary": "RHBZ#2393164",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393164"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38729",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38729"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38729",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38729"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025090403-CVE-2025-38729-ca88@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025090403-CVE-2025-38729-ca88@gregkh/T"
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"title": "kernel: ipv6: sr: Fix MAC comparison to be constant-time"
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{
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"text": "A flaw out of boundary read in the Linux kernel NFS functionality was found in the way connected user sends malicious data to the server. A remote user could use this flaw to crash the system.",
"title": "Vulnerability description"
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{
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"text": "kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in the NFS server implementation where nfs_fh_to_dentry() failed to properly validate the minimal filehandle length before accessing the embedded structure. An attacker with access to an exported NFS share could send a crafted filehandle, leading to out-of-bounds memory access and a potential kernel crash. This issue results in a remote denial of service against the NFS server.\nThis flaw is limited to a missing bounds check in nfs_fh_to_dentry(), which causes an out-of-bounds read and a kernel crash.",
"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.",
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{
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{
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{
"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.",
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{
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},
{
"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.",
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{
"category": "external",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
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"title": "kernel: x86/vmscape: Add conditional IBPB mitigation"
}
]
}
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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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