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Review reviewHigh

CVE-2026-64032

Linux

In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix a possible use-after-free when removing a bridge port When per-VLAN multicast snooping is enabled, the bridge iterates over all the bridge ports, disables the per-port multicast context on each port and enables the per-{port, VLAN} multicast contexts instead. The reverse happens when per-VLAN multicast snooping is disabled. When global multicast snooping is enabled, the bridge iterates over all the bridge ports and enables the per-port multicast context on each port. The reverse happens when multicast sno...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix a possible use-after-free when removing a bridge port When per-VLAN multicast snooping is enabled, the bridge iterates over all the bridge ports, disables the per-port multicast context on each port and enables the per-{port, VLAN} multicast contexts instead. The reverse happens when per-VLAN multicast snooping is disabled. When global multicast snooping is enabled, the bridge iterates over all the bridge ports and enables the per-port multicast context on each port. The reverse happens when multicast sno...

Affected product and versions

Product
Linux
Affected versions
>= 410a033bfa8c7daefbae0225c836693db2149ec1 < ddefd1b8e5eb58933a697ab38334f0fd82e7fb8b, >= c6d16eab122744df698f18b47cf771945cd55066 < ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70, >= b4c83b37490d61cfdd62a2b29e98a9b89004b5c0 < 1900ca8acb92fbea8bf9abef9927c7fed03db7fc, >= 78f768e36c065ca3f88272fcf39014782c2d4ecd < ebe5561154c823b323bd06e350b55e0b8604d851, >= 4b30ae9adb047dd0a7982975ec3933c529537026 < a9224862d597d0eed0a34bbb27343f703fc4113f, >= 4b30ae9adb047dd0a7982975ec3933c529537026 < 7213256c91ed778a0997c2029c152b18dc50e4fd, >= 4b30ae9adb047dd0a7982975ec3933c529537026 < 4df78ff02629c7729168f0696a7a2123c389818d, >= c996e25df0b3282c724bb5aca434518bc08cd963, >= 5.15.186 < 5.15.209, >= 6.1.142 < 6.1.175, >= 6.6.95 < 6.6.142, >= 6.12.35 < 6.12.92, >= 6.15.4 < 6.16, >= 6.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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
Not available