Vulnerability-Lookup

RHSA-2026:63538

Vulnerability from csaf_opensuse - Published: 2026-09-04 00:00 - Updated: 2026-09-15 07:36

Summary

security update for kernel

Severity

Important

Notes

Title of the patch: security update for kernel

Description of the patch: This security update provides a functional equivalent of RHSA-2026:63538. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:63538.

Patchnames: RHSA-2026:63538

CVE-2026-74480

7.5 (High)


                
                  CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Recommended 13 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 7 LTSS:bpftool-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-abi-whitelists-3.10.0-1160.160.1.el7.noarch	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-debug-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-debug-devel-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-devel-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-doc-3.10.0-1160.160.1.el7.noarch	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-headers-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-tools-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-tools-libs-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:kernel-tools-libs-devel-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:perf-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:python-perf-3.10.0-1160.160.1.el7.x86_64	—	Vendor Fix

Threats

Impact important

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://www.suse.com/security/cve/CVE-2026-74480/	self
https://www.suse.com/security/cve/CVE-2026-74480	external
https://bugzilla.suse.com/1276353	external
https://bugzilla.suse.com/1279853	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-74480",
      "ids": [
        {
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          "text": "https://www.suse.com/security/cve/CVE-2026-74480"
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      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: stop fast-leave after deleting a port group\n\nbr_multicast_leave_group() iterates mp-\u003eports with pp = \u0026p-\u003enext in\nits fast-leave path. After br_multicast_del_pg() removes p,\ncontinuing the loop advances pp through the deleted entry.\n\nIf multicast-to-unicast was enabled, the bridge can hold multiple port\ngroups for the same port and group with different source MAC\naddresses. Once multicast-to-unicast is disabled,\nbr_port_group_equal() matches those entries by port only. A fast leave\ncan then delete one entry and continue from its stale next pointer,\nleaving mp-\u003eports pointing at a deleted port group.\n\nFast leave only needs to remove one matching port group. Break after\nbr_multicast_del_pg() so the loop stops before dereferencing the\nremoved entry.",
          "title": "CVE description"
        }
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          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Liberty Linux 7 LTSS:bpftool-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-abi-whitelists-3.10.0-1160.160.1.el7.noarch",
            "SUSE Liberty Linux 7 LTSS:kernel-debug-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-debug-devel-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-devel-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-doc-3.10.0-1160.160.1.el7.noarch",
            "SUSE Liberty Linux 7 LTSS:kernel-headers-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-tools-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-tools-libs-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:kernel-tools-libs-devel-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:perf-3.10.0-1160.160.1.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:python-perf-3.10.0-1160.160.1.el7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-09-04T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-74480"
    }
  ]
}

CVE-2026-74480 (GCVE-0-2026-74480)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

Title

net: bridge: stop fast-leave after deleting a port group

Summary

In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, continuing the loop advances pp through the deleted entry. If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, br_port_group_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group. Fast leave only needs to remove one matching port group. Break after br_multicast_del_pg() so the loop stops before dereferencing the removed entry.

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d6c32e2e25a9a06ba…
https://git.kernel.org/stable/c/482bcb85139addb4e…
https://git.kernel.org/stable/c/1a109cc9890d017c4…
https://git.kernel.org/stable/c/159ad90cb929c0333…
https://git.kernel.org/stable/c/4695430e8132420bf…
https://git.kernel.org/stable/c/0309ebbc570000ea0…
https://git.kernel.org/stable/c/4c57056ca6aace2e9…
https://git.kernel.org/stable/c/a39789f211b8a4125…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < d6c32e2e25a9a06ba021030e26b6d602a277eb72 (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 482bcb85139addb4e8ac8ed10baeda3e0aad4031 (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 1a109cc9890d017c41d77e6c82da739579c49f0b (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 159ad90cb929c033308bb39a2c5f8fbf393b77aa (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 4695430e8132420bf8de94da3eb36a6cf35fde6b (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 0309ebbc570000ea0df11c06b69798e5860c5f6f (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < 4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4 (git) Affected: 6db6f0eae6052b70885562e1733896647ec1d807 , < a39789f211b8a4125f0c70e05b30cf715f4f187d (git)
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

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To clipboard

{
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          "programFiles": [
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              "status": "unaffected",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: stop fast-leave after deleting a port group\n\nbr_multicast_leave_group() iterates mp-\u003eports with pp = \u0026p-\u003enext in\nits fast-leave path. After br_multicast_del_pg() removes p,\ncontinuing the loop advances pp through the deleted entry.\n\nIf multicast-to-unicast was enabled, the bridge can hold multiple port\ngroups for the same port and group with different source MAC\naddresses. Once multicast-to-unicast is disabled,\nbr_port_group_equal() matches those entries by port only. A fast leave\ncan then delete one entry and continue from its stale next pointer,\nleaving mp-\u003eports pointing at a deleted port group.\n\nFast leave only needs to remove one matching port group. Break after\nbr_multicast_del_pg() so the loop stops before dereferencing the\nremoved entry."
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              "value": "AV:N - The bug is reached when the bridge network stack processes attacker-supplied IGMP/MLD Leave packets received on a bridge port (br_handle_frame_finish -\u003e br_multicast_rcv -\u003e br_ip4/ip6_multicast_leave_group -\u003e br_multicast_leave_group), requiring no local syscall access.\nAC:L - Once a bridge has IGMP snooping, fast-leave, and leftover duplicate port groups (common on WiFi APs that used multicast-to-unicast), an attacker can reliably trigger the bug by sending IGMP/MLD joins then a Leave; no uncontrollable race or rare timing is required.\nPR:N - No privileges or authentication are required on the target; any host on an attached bridge port can inject IGMP/MLD Leave packets that are processed and reach the vulnerable fast-leave deletion loop.\nUI:N - Exploitation requires only attacker-sent multicast control packets; no victim user action such as opening files, clicking links, or mounting filesystems is needed.\nS:U - Impact is kernel heap corruption and use-after-free within the bridge/multicast subsystem on the same host; it does not cross a VM/hypervisor or IOMMU security boundary by itself.\nC:H - Deleting a port group then continuing the list walk dereferences freed net_bridge_port_group memory and can leave mp-\u003eports dangling, giving a use-after-free read primitive exploitable for arbitrary kernel memory disclosure.\nI:H - Corrupting the mp-\u003eports linked list via stale next pointers after br_multicast_del_pg() enables attacker-influenced kernel heap corruption that can be developed into arbitrary write and privilege escalation.\nA:H - The use-after-free and corrupted multicast database pointers cause kernel oops/panics when subsequent bridge multicast forwarding or MDB operations traverse the broken port-group list, enabling repeatable denial of service."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:33.031Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/a39789f211b8a4125f0c70e05b30cf715f4f187d"
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      "title": "net: bridge: stop fast-leave after deleting a port group",
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    "cveId": "CVE-2026-74480",
    "datePublished": "2026-08-15T12:27:13.803Z",
    "dateReserved": "2026-08-15T05:44:03.904Z",
    "dateUpdated": "2026-08-19T16:37:33.031Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.