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CVE-2026-49412

nvd nist
Published: Jun 27, 2026Modified: Jul 1, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory. An unprivileged local user can exploit this use-after-free to escalate privileges.

Affected (31)

Products: Freebsd: Freebsd
Freebsd
1 product
Freebsd
Configuration A
31 vulnerable
Vulnerable SoftwareAffected Versions
Freebsd
Freebsd
Version 14.3
Freebsd
Version 14.3 p10
Freebsd
Version 14.3 p11
Freebsd
Version 14.3 p12
Freebsd
Version 14.3 p13
Freebsd
Version 14.3 p14
Freebsd
Version 14.3 p1
Freebsd
Version 14.3 p2
Freebsd
Version 14.3 p3
Freebsd
Version 14.3 p4
Freebsd
Version 14.3 p5
Freebsd
Version 14.3 p6
Freebsd
Version 14.3 p7
Freebsd
Version 14.3 p8
Freebsd
Version 14.3 p9
Freebsd
Version 14.4
Freebsd
Version 14.4 p1
Freebsd
Version 14.4 p2
Freebsd
Version 14.4 p3
Freebsd
Version 14.4 p4
Freebsd
Version 14.4 p5
Freebsd
Version 15.0
Freebsd
Version 15.0 p1
Freebsd
Version 15.0 p2
Freebsd
Version 15.0 p3
Freebsd
Version 15.0 p4
Freebsd
Version 15.0 p5
Freebsd
Version 15.0 p6
Freebsd
Version 15.0 p7
Freebsd
Version 15.0 p8
Freebsd
Version 15.0 p9

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (1)

Source: secteam@freebsd.org
Vendor Advisory

Timeline

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