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Review reviewHigh

CVE-2025-38248

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix use-after-free during router port configuration The bridge maintains a global list of ports behind which a multicast router resides. The list is consulted during forwarding to ensure multicast packets are forwarded to these ports even if the ports are not member in the matching MDB entry. When per-VLAN multicast snooping is enabled, the per-port multicast context is disabled on each port and the port is removed from the global router port list: # ip link add name br1 up type bridge vlan_filtering 1 mcast_...

CVSS
7.8
EPSS
0.25%
16.8% percentile
CISA KEV
Not listed
Published
2025.07.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.25%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix use-after-free during router port configuration The bridge maintains a global list of ports behind which a multicast router resides. The list is consulted during forwarding to ensure multicast packets are forwarded to these ports even if the ports are not member in the matching MDB entry. When per-VLAN multicast snooping is enabled, the per-port multicast context is disabled on each port and the port is removed from the global router port list: # ip link add name br1 up type bridge vlan_filtering 1 mcast_...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 2796d846d74a18cc6563e96eff8bf28c5e06f912 < 4d3c2a1d4c7c33103f1ddfdbc5cfe1ea4f6d0dcd, >= 2796d846d74a18cc6563e96eff8bf28c5e06f912 < bdced577da71b118b6ed4242ebd47f81bf54d406, >= 2796d846d74a18cc6563e96eff8bf28c5e06f912 < f05a4f9e959e0fc098046044c650acf897ea52d2, >= 2796d846d74a18cc6563e96eff8bf28c5e06f912 < 7544f3f5b0b58c396f374d060898b5939da31709, >= 5.15, >= 5.15 < 6.15.5, 6.16
Fixed versions
6.15.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416