Bug 2419891 (CVE-2025-40294)

Summary: CVE-2025-40294 kernel: Linux kernel: Out-of-bounds write in Bluetooth MGMT can lead to information disclosure and denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's Bluetooth management (MGMT) subsystem. A local attacker could exploit an out-of-bounds (OOB) write vulnerability in the `parse_adv_monitor_pattern()` function. This occurs when user-controlled input for the `length` variable exceeds the buffer's capacity during a copy operation, potentially leading to information disclosure and a denial of service (DoS).
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Description OSIDB Bzimport 2025-12-08 07:06:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern()

In the parse_adv_monitor_pattern() function, the value of
the 'length' variable is currently limited to HCI_MAX_EXT_AD_LENGTH(251).
The size of the 'value' array in the mgmt_adv_pattern structure is 31.
If the value of 'pattern[i].length' is set in the user space
and exceeds 31, the 'patterns[i].value' array can be accessed
out of bound when copied.

Increasing the size of the 'value' array in
the 'mgmt_adv_pattern' structure will break the userspace.
Considering this, and to avoid OOB access revert the limits for 'offset'
and 'length' back to the value of HCI_MAX_AD_LENGTH.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.
Comment 1 Jon Moroney 2025-12-08 22:19:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120818-CVE-2025-40294-b8e3@gregkh/T
Comment 4 errata-xmlrpc 2026-01-26 14:21:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1143 https://access.redhat.com/errata/RHSA-2026:1143
Comment 5 errata-xmlrpc 2026-02-02 09:50:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1690 https://access.redhat.com/errata/RHSA-2026:1690
Comment 7 errata-xmlrpc 2026-02-09 17:46:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:2352 https://access.redhat.com/errata/RHSA-2026:2352
Comment 8 errata-xmlrpc 2026-02-12 00:44:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:2594 https://access.redhat.com/errata/RHSA-2026:2594
Comment 9 errata-xmlrpc 2026-02-16 17:47:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:2761 https://access.redhat.com/errata/RHSA-2026:2761