{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63834",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.015Z",
        "datePublished": "2026-07-19T12:02:26.045Z",
        "dateUpdated": "2026-08-17T04:51:44.393Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:51:44.393Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: restrict number of unacked list entries\n\nWhen the unacked_list is unbound, an attacker could send messages with\nsmall lengths and appropriated seqno + gaps to force the receiver to\nallocate more and more unacked_list entries. And the end either causing an\nout-of-memory situation or increase the management overhead for the (large)\nlist that significant portions of CPU cycles are wasted in searching\nthrough the list.\n\nWhen limiting the list to a specific number, it is important to still\ncorrectly add a new entry to the list. But if the list became larger than\nthe limit, the last entry of the list (with the highest seqno) must be\ndropped to still allow the earlier seqnos to finish and therefore to\ncontinue the process. Otherwise, the process might get stuck with too high\nseqnos which are not handled by batadv_tp_ack_unordered()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/batman-adv/tp_meter.c",
                        "net/batman-adv/types.h"
                    ],
                    "versions": [
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "31a88792bfba142be3c9521538c1db805677381f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "1111a3381bca2d1f084a07686bc783af5ab23df7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "1c616b0be4bd8399d485e25e91859373b95d6013",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "f8c499fd275e59203b77fca76ae6ef2d096c2133",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "c6231d628d06d841bc1617b2f7034f5f39876b16",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "2233787658db859f0a9b83cb397cf783bb8be865",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "1fb8762600a393d1caccd63be5d07e1756982d68",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
                            "lessThan": "e7c775110e1858e5a7471a23a9c9658c0af9df89",
                            "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/batman-adv/tp_meter.c",
                        "net/batman-adv/types.h"
                    ],
                    "versions": [
                        {
                            "version": "4.8",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.8",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.260",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.211",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.177",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.144",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.95",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.38",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.3",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "4.8",
                                    "versionEndExcluding": "5.10.260"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "5.15.211"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "6.1.177"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "6.6.144"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "6.12.95"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "6.18.38"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "7.1.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.8",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89"
                }
            ],
            "title": "batman-adv: tp_meter: restrict number of unacked list entries",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}