{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31420",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.088Z",
        "datePublished": "2026-04-13T13:40:24.594Z",
        "dateUpdated": "2026-09-14T11:58:16.075Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-09-14T11:58:16.075Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: mrp: reject zero test interval to avoid OOM panic\n\nbr_mrp_start_test() and br_mrp_start_in_test() accept the user-supplied\ninterval value from netlink without validation. When interval is 0,\nusecs_to_jiffies(0) yields 0, causing the delayed work\n(br_mrp_test_work_expired / br_mrp_in_test_work_expired) to reschedule\nitself with zero delay. This creates a tight loop on system_percpu_wq\nthat allocates and transmits MRP test frames at maximum rate, exhausting\nall system memory and causing a kernel panic via OOM deadlock.\n\nThe same zero-interval issue applies to br_mrp_start_in_test_parse()\nfor interconnect test frames.\n\nUse NLA_POLICY_MIN(NLA_U32, 1) in the nla_policy tables for both\nIFLA_BRIDGE_MRP_START_TEST_INTERVAL and\nIFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL, so zero is rejected at the\nnetlink attribute parsing layer before the value ever reaches the\nworkqueue scheduling code. This is consistent with how other bridge\nsubsystems (br_fdb, br_mst) enforce range constraints on netlink\nattributes."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bridge/br_mrp_netlink.c"
                    ],
                    "versions": [
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "610073ffb77ffd2b5eca182d2ac264de4834a175",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "ec8850be9b2b3beac1c7967d95f169dd2785979d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "1ec86b4b9e28170a2565cf36f0e6e2b96b55134d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "2120bd8546cd6a63c558d135773aa8f41c8259fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "630a15a31c2034b5b697f4aabc769b9d80d82446",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "e8ec80430bfa520e7352155d6ac632e527cba7aa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "c9bc352f716d1bebfe43354bce539ec2d0223b30",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "20f6a05ef63594feb0c6dfbd629da0448b43124d",
                            "lessThan": "fa6e24963342de4370e3a3c9af41e38277b74cf3",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bridge/br_mrp_netlink.c"
                    ],
                    "versions": [
                        {
                            "version": "5.8",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.8",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.92",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.34",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.8",
                                    "versionEndExcluding": "5.10.270"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.8",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
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                                    "versionStartIncluding": "5.8",
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                                    "versionStartIncluding": "5.8",
                                    "versionEndExcluding": "6.12.92"
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                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.8",
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                                    "versionStartIncluding": "5.8",
                                    "versionEndExcluding": "6.19.12"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.8",
                                    "versionEndExcluding": "7.0"
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                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/610073ffb77ffd2b5eca182d2ac264de4834a175"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ec8850be9b2b3beac1c7967d95f169dd2785979d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1ec86b4b9e28170a2565cf36f0e6e2b96b55134d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2120bd8546cd6a63c558d135773aa8f41c8259fc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/630a15a31c2034b5b697f4aabc769b9d80d82446"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e8ec80430bfa520e7352155d6ac632e527cba7aa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c9bc352f716d1bebfe43354bce539ec2d0223b30"
                },
                {
                    "url": "https://git.kernel.org/stable/c/fa6e24963342de4370e3a3c9af41e38277b74cf3"
                }
            ],
            "title": "bridge: mrp: reject zero test interval to avoid OOM panic",
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}