CVE-2026-64032 (GCVE-0-2026-64032)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
bridge: mcast: Fix a possible use-after-free when removing a bridge port
Summary
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 snooping is disabled. The above scheme can result in a situation where both types of contexts (per-port and per-{port, VLAN}) are enabled on a single bridge port: # ip link add name br1 up type bridge mcast_snooping 1 mcast_querier 1 vlan_filtering 1 # ip link add name dummy1 up master br1 type dummy # ip link set dev br1 type bridge mcast_vlan_snooping 1 # ip link set dev br1 type bridge mcast_snooping 0 # ip link set dev br1 type bridge mcast_snooping 1 This is not intended and it is a problem since the commit cited below. Prior to this commit, when removing a bridge port, br_multicast_disable_port() would disable the per-port multicast context and the per-{port, VLAN} multicast contexts would get disabled when flushing VLANs. After this commit, br_multicast_disable_port() only disables the per-port multicast context if per-VLAN multicast snooping is disabled. If both types of contexts were enabled on the port when it was removed, the per-port multicast context would remain enabled when freeing the bridge port, leading to a use-after-free [1]. Fix by preventing the bridge from enabling / disabling the per-port multicast contexts when toggling global multicast snooping if per-VLAN multicast snooping is enabled. [1] ODEBUG: free active (active state 0) object: ffff88810f8bda78 object type: timer_list hint: br_ip6_multicast_port_query_expired (net/bridge/br_multicast.c:1927) WARNING: lib/debugobjects.c:629 at debug_print_object+0x1b1/0x3e0, CPU#5: swapper/5/0 [...] Call Trace: <IRQ> __debug_check_no_obj_freed (lib/debugobjects.c:1116) kfree (mm/slub.c:2620 mm/slub.c:6250 mm/slub.c:6565) kobject_cleanup (lib/kobject.c:689) rcu_do_batch (kernel/rcu/tree.c:2617) rcu_core (kernel/rcu/tree.c:2869) handle_softirqs (kernel/softirq.c:622) __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735) irq_exit_rcu (kernel/softirq.c:752) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 47) arch/x86/kernel/apic/apic.c:1061 (discriminator 47)) </IRQ>
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 410a033bfa8c7daefbae0225c836693db2149ec1 , < ddefd1b8e5eb58933a697ab38334f0fd82e7fb8b (git)
Affected: c6d16eab122744df698f18b47cf771945cd55066 , < ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70 (git)
Affected: b4c83b37490d61cfdd62a2b29e98a9b89004b5c0 , < 1900ca8acb92fbea8bf9abef9927c7fed03db7fc (git)
Affected: 78f768e36c065ca3f88272fcf39014782c2d4ecd , < ebe5561154c823b323bd06e350b55e0b8604d851 (git)
Affected: 4b30ae9adb047dd0a7982975ec3933c529537026 , < a9224862d597d0eed0a34bbb27343f703fc4113f (git)
Affected: 4b30ae9adb047dd0a7982975ec3933c529537026 , < 7213256c91ed778a0997c2029c152b18dc50e4fd (git)
Affected: 4b30ae9adb047dd0a7982975ec3933c529537026 , < 4df78ff02629c7729168f0696a7a2123c389818d (git)
Affected: c996e25df0b3282c724bb5aca434518bc08cd963 (git)
Affected: 5.15.186 , < 5.15.209 (semver)
Affected: 6.1.142 , < 6.1.175 (semver)
Affected: 6.6.95 , < 6.6.142 (semver)
Affected: 6.12.35 , < 6.12.92 (semver)
Affected: 6.15.4 , < 6.16 (semver)
Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: mcast: Fix a possible use-after-free when removing a bridge port\n\nWhen per-VLAN multicast snooping is enabled, the bridge iterates over\nall the bridge ports, disables the per-port multicast context on each\nport and enables the per-{port, VLAN} multicast contexts instead. The\nreverse happens when per-VLAN multicast snooping is disabled.\n\nWhen global multicast snooping is enabled, the bridge iterates over all\nthe bridge ports and enables the per-port multicast context on each\nport. The reverse happens when multicast snooping is disabled.\n\nThe above scheme can result in a situation where both types of contexts\n(per-port and per-{port, VLAN}) are enabled on a single bridge port:\n\n # ip link add name br1 up type bridge mcast_snooping 1 mcast_querier 1 vlan_filtering 1\n # ip link add name dummy1 up master br1 type dummy\n # ip link set dev br1 type bridge mcast_vlan_snooping 1\n # ip link set dev br1 type bridge mcast_snooping 0\n # ip link set dev br1 type bridge mcast_snooping 1\n\nThis is not intended and it is a problem since the commit cited below.\nPrior to this commit, when removing a bridge port,\nbr_multicast_disable_port() would disable the per-port multicast context\nand the per-{port, VLAN} multicast contexts would get disabled when\nflushing VLANs.\n\nAfter this commit, br_multicast_disable_port() only disables the\nper-port multicast context if per-VLAN multicast snooping is disabled.\nIf both types of contexts were enabled on the port when it was removed,\nthe per-port multicast context would remain enabled when freeing the\nbridge port, leading to a use-after-free [1].\n\nFix by preventing the bridge from enabling / disabling the per-port\nmulticast contexts when toggling global multicast snooping if per-VLAN\nmulticast snooping is enabled.\n\n[1]\nODEBUG: free active (active state 0) object: ffff88810f8bda78 object type: timer_list hint: br_ip6_multicast_port_query_expired (net/bridge/br_multicast.c:1927)\nWARNING: lib/debugobjects.c:629 at debug_print_object+0x1b1/0x3e0, CPU#5: swapper/5/0\n[...]\nCall Trace:\n\u003cIRQ\u003e\n__debug_check_no_obj_freed (lib/debugobjects.c:1116)\nkfree (mm/slub.c:2620 mm/slub.c:6250 mm/slub.c:6565)\nkobject_cleanup (lib/kobject.c:689)\nrcu_do_batch (kernel/rcu/tree.c:2617)\nrcu_core (kernel/rcu/tree.c:2869)\nhandle_softirqs (kernel/softirq.c:622)\n__irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)\nirq_exit_rcu (kernel/softirq.c:752)\nsysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 47) arch/x86/kernel/apic/apic.c:1061 (discriminator 47))\n\u003c/IRQ\u003e"
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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        "dateUpdated": "2026-07-20T13:42:35.854Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ddefd1b8e5eb58933a697ab38334f0fd82e7fb8b"
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          "url": "https://git.kernel.org/stable/c/ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4df78ff02629c7729168f0696a7a2123c389818d"
        }
      ],
      "title": "bridge: mcast: Fix a possible use-after-free when removing a bridge port",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64032",
    "datePublished": "2026-07-19T15:39:22.228Z",
    "dateReserved": "2026-07-19T07:54:57.028Z",
    "dateUpdated": "2026-07-20T13:42:35.854Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-64032",
      "date": "2026-07-21",
      "epss": "0.00125",
      "percentile": "0.02625"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64032\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:43.350\",\"lastModified\":\"2026-07-20T15:17:04.047\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbridge: mcast: Fix a possible use-after-free when removing a bridge port\\n\\nWhen per-VLAN multicast snooping is enabled, the bridge iterates over\\nall the bridge ports, disables the per-port multicast context on each\\nport and enables the per-{port, VLAN} multicast contexts instead. The\\nreverse happens when per-VLAN multicast snooping is disabled.\\n\\nWhen global multicast snooping is enabled, the bridge iterates over all\\nthe bridge ports and enables the per-port multicast context on each\\nport. The reverse happens when multicast snooping is disabled.\\n\\nThe above scheme can result in a situation where both types of contexts\\n(per-port and per-{port, VLAN}) are enabled on a single bridge port:\\n\\n # ip link add name br1 up type bridge mcast_snooping 1 mcast_querier 1 vlan_filtering 1\\n # ip link add name dummy1 up master br1 type dummy\\n # ip link set dev br1 type bridge mcast_vlan_snooping 1\\n # ip link set dev br1 type bridge mcast_snooping 0\\n # ip link set dev br1 type bridge mcast_snooping 1\\n\\nThis is not intended and it is a problem since the commit cited below.\\nPrior to this commit, when removing a bridge port,\\nbr_multicast_disable_port() would disable the per-port multicast context\\nand the per-{port, VLAN} multicast contexts would get disabled when\\nflushing VLANs.\\n\\nAfter this commit, br_multicast_disable_port() only disables the\\nper-port multicast context if per-VLAN multicast snooping is disabled.\\nIf both types of contexts were enabled on the port when it was removed,\\nthe per-port multicast context would remain enabled when freeing the\\nbridge port, leading to a use-after-free [1].\\n\\nFix by preventing the bridge from enabling / disabling the per-port\\nmulticast contexts when toggling global multicast snooping if per-VLAN\\nmulticast snooping is enabled.\\n\\n[1]\\nODEBUG: free active (active state 0) object: ffff88810f8bda78 object type: timer_list hint: br_ip6_multicast_port_query_expired (net/bridge/br_multicast.c:1927)\\nWARNING: lib/debugobjects.c:629 at debug_print_object+0x1b1/0x3e0, CPU#5: swapper/5/0\\n[...]\\nCall Trace:\\n\u003cIRQ\u003e\\n__debug_check_no_obj_freed (lib/debugobjects.c:1116)\\nkfree (mm/slub.c:2620 mm/slub.c:6250 mm/slub.c:6565)\\nkobject_cleanup (lib/kobject.c:689)\\nrcu_do_batch (kernel/rcu/tree.c:2617)\\nrcu_core (kernel/rcu/tree.c:2869)\\nhandle_softirqs (kernel/softirq.c:622)\\n__irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)\\nirq_exit_rcu (kernel/softirq.c:752)\\nsysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 47) arch/x86/kernel/apic/apic.c:1061 (discriminator 47))\\n\u003c/IRQ\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bridge/br_multicast.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"410a033bfa8c7daefbae0225c836693db2149ec1\",\"lessThan\":\"ddefd1b8e5eb58933a697ab38334f0fd82e7fb8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6d16eab122744df698f18b47cf771945cd55066\",\"lessThan\":\"ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4c83b37490d61cfdd62a2b29e98a9b89004b5c0\",\"lessThan\":\"1900ca8acb92fbea8bf9abef9927c7fed03db7fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"78f768e36c065ca3f88272fcf39014782c2d4ecd\",\"lessThan\":\"ebe5561154c823b323bd06e350b55e0b8604d851\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4b30ae9adb047dd0a7982975ec3933c529537026\",\"lessThan\":\"a9224862d597d0eed0a34bbb27343f703fc4113f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4b30ae9adb047dd0a7982975ec3933c529537026\",\"lessThan\":\"7213256c91ed778a0997c2029c152b18dc50e4fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4b30ae9adb047dd0a7982975ec3933c529537026\",\"lessThan\":\"4df78ff02629c7729168f0696a7a2123c389818d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c996e25df0b3282c724bb5aca434518bc08cd963\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.186\",\"lessThan\":\"5.15.209\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.142\",\"lessThan\":\"6.1.175\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.95\",\"lessThan\":\"6.6.142\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.35\",\"lessThan\":\"6.12.92\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.15.4\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bridge/br_multicast.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1900ca8acb92fbea8bf9abef9927c7fed03db7fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4df78ff02629c7729168f0696a7a2123c389818d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7213256c91ed778a0997c2029c152b18dc50e4fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9224862d597d0eed0a34bbb27343f703fc4113f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddefd1b8e5eb58933a697ab38334f0fd82e7fb8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebe5561154c823b323bd06e350b55e0b8604d851\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.