RHSA-2025:19103

Vulnerability from csaf_redhat - Published: 2025-10-27 09:41 - Updated: 2026-03-13 01:09
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 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: 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: Bluetooth: Fix potential use-after-free when clear keys (CVE-2023-53386) * kernel: Bluetooth: L2CAP: Fix user-after-free (CVE-2022-50386) * kernel: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() (CVE-2025-39849) * kernel: scsi: lpfc: Fix buffer free/clear order in deferred receive path (CVE-2025-39841) 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-2022-50386

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix user-after-free This uses l2cap_chan_hold_unless_zero() after calling __l2cap_get_chan_blah() to prevent the following trace: Bluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref *kref) Bluetooth: chan 0000000023c4974d Bluetooth: parent 00000000ae861c08 ================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:191 [inline] BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:671 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x278/0x400 kernel/locking/mutex.c:729 Read of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389

7.6 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
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-2025:19103
Workaround To mitigate these vulnerabilities on the operating system level, disable the Bluetooth functionality via blocklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Instructions on how to disable Bluetooth modules are available on the customer portal at https://access.redhat.com/solutions/2682931. Alternatively, bluetooth can be disabled within the hardware or at the BIOS level, which will also provide effective mitigation as the kernel will not detect Bluetooth hardware on the system.
CVE-2023-53297

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp conn->chan_lock isn't acquired before l2cap_get_chan_by_scid, if l2cap_get_chan_by_scid returns NULL, then 'bad unlock balance' is triggered.

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
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-2025:19103
CVE-2023-53386

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix potential use-after-free when clear keys Similar to commit c5d2b6fa26b5 ("Bluetooth: Fix use-after-free in hci_remove_ltk/hci_remove_irk"). We can not access k after kfree_rcu() call.

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-416 - Use After Free
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-2025:19103
Workaround To mitigate these vulnerabilities on the operating system level, disable the Bluetooth functionality via blocklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Instructions on how to disable Bluetooth modules are available on the customer portal at https://access.redhat.com/solutions/2682931. Alternatively, bluetooth can be disabled within the hardware or at the BIOS level, which will also provide effective mitigation as the kernel will not detect Bluetooth hardware on the system.
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
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-2025:19103
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.
CVE-2025-39841

A use-after-free vulnerability exists in the linux kernel such that the buffer release sequence in the deferred receive path. The code freed the RQ buffer first and only then cleared the context pointer under the lock.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
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-2025:19103
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.
CVE-2025-39849

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() If the ssid->datalen is more than IEEE80211_MAX_SSID_LEN (32) it would lead to memory corruption so add some bounds checking.

7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
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-2025:19103
Workaround To mitigate this issue, prevent module cfg80211 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
https://access.redhat.com/errata/RHSA-2025:19103 self
https://access.redhat.com/security/updates/classi… 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=2396419 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396431 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396928 external
https://bugzilla.redhat.com/show_bug.cgi?id=2396944 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2022-50386 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396431 external
https://www.cve.org/CVERecord?id=CVE-2022-50386 external
https://nvd.nist.gov/vuln/detail/CVE-2022-50386 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-2023-53386 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396419 external
https://www.cve.org/CVERecord?id=CVE-2023-53386 external
https://nvd.nist.gov/vuln/detail/CVE-2023-53386 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-2025-39841 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396944 external
https://www.cve.org/CVERecord?id=CVE-2025-39841 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39841 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-39849 self
https://bugzilla.redhat.com/show_bug.cgi?id=2396928 external
https://www.cve.org/CVERecord?id=CVE-2025-39849 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39849 external
https://lore.kernel.org/linux-cve-announce/202509… external
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      "discovery_date": "2025-09-18T00:00:00+00:00",
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2396431"
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          "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"
        },
        {
          "category": "other",
          "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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          "title": "Vulnerability description"
        },
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          "text": "kernel: Bluetooth: L2CAP: fix \"bad unlock balance\" in l2cap_disconnect_rsp",
          "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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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix potential use-after-free when clear keys\n\nSimilar to commit c5d2b6fa26b5 (\"Bluetooth: Fix use-after-free in\nhci_remove_ltk/hci_remove_irk\"). We can not access k after kfree_rcu()\ncall.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Bluetooth: Fix potential use-after-free when clear keys",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A use-after-free bug was identified in the Bluetooth stack when clearing link and security keys. The code iterated with list_for_each_entry() and freed items with kfree_rcu(), allowing access to freed memory.\nA local user with Bluetooth administration privileges (e.g. able to unpair devices, reset the adapter or manage stored keys) can reliably trigger this bug, causing use-after-free and likely DoS/kernel crash. And the confidential data leakage from freed memory is theoretically possible. Triggering this remotely is difficult \u2014 an unauthenticated/unknown device generally cannot force the kernel to clear those local key lists \u2014 and would realistically require a device that is already paired/authenticated (or otherwise an exploit chain) to influence the same code paths.",
          "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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      "cve": "CVE-2025-39849",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()\n\nIf the ssid-\u003edatalen is more than IEEE80211_MAX_SSID_LEN (32) it would\nlead to memory corruption so add some bounds checking.",
          "title": "Vulnerability description"
        },
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          "text": "kernel: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()",
          "title": "Vulnerability summary"
        },
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          "text": "A bounds check was missing when copying the SSID IE in __cfg80211_connect_result(), allowing an over-length SSID element to overflow a fixed-size kernel buffer. A malicious AP or 802.11 frame injector in radio range could trigger kernel memory corruption during connection/auto-connect, leading to crash or potential code execution.",
          "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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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()"
    }
  ]
}


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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.



Detection rules are retrieved from Rulezet.