{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46206", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.105Z", "datePublished": "2026-05-28T09:40:23.993Z", "dateUpdated": "2026-08-05T12:30:28.363Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:28.363Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject new tp_meter sessions during teardown\n\nPrevent tp_meter from starting new sender or receiver sessions after\nmesh_state has left BATADV_MESH_ACTIVE." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached via the netlink BATADV_CMD_TP_METER command (local genl socket) or via mesh packets injected into a locally-set-up batadv interface; batman-adv is an L2 mesh protocol, not internet-routable, so this requires local access rather than Network.\nAC:L - This is a teardown race, but a local attacker controls both sides — repeatedly creating/destroying the soft interface (driving mesh_free/batadv_tp_stop_all) in one thread while starting tp_meter sessions in another — and can retry the loop indefinitely until the window is won.\nPR:L - TP_METER is gated by GENL_UNS_ADMIN_PERM (namespaced CAP_NET_ADMIN), which an unprivileged user obtains via `unshare -Urn`, then creates their own batadv mesh interface; no real root is required.\nUI:N - The attacker drives both the session start and the interface teardown themselves; no action by any other user is needed.\nS:U - The use-after-free corrupts kernel heap objects within the kernel's own security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The surviving session holds a dangling pointer to freed tp_vars/bat_priv memory; reclaiming and reading that freed object enables disclosure of kernel memory contents.\nI:H - The use-after-free permits heap spraying of the freed object and a controlled write through the stale timer/kthread/work references, enabling memory corruption and potential control-flow hijack.\nA:H - A timer/kthread/delayed work operating on freed mesh structures reliably triggers an oops/panic, crashing the kernel." } ] } ], "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" ], "versions": [ { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "0a7a840074c9ca5ebffc9c52358c8ea55828ec71", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "dcff44644bb518598b1a6be722706d6174b2f6a1", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "52e6ec3e972cf27792cc1559874dbee19f286869", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "ff93f86ecbb50a4709c403fc279a396e308edde5", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "e1e2194cc725ec1d41f9412496212f0fa0519c36", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "ca39545cf07c142b39d474a1439a046bf28def3d", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "3243543592425beec83d453793e9d27caa0d8e66", "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" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.9", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.90" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.0.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0a7a840074c9ca5ebffc9c52358c8ea55828ec71" }, { "url": "https://git.kernel.org/stable/c/dcff44644bb518598b1a6be722706d6174b2f6a1" }, { "url": "https://git.kernel.org/stable/c/52e6ec3e972cf27792cc1559874dbee19f286869" }, { "url": "https://git.kernel.org/stable/c/e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6" }, { "url": "https://git.kernel.org/stable/c/ff93f86ecbb50a4709c403fc279a396e308edde5" }, { "url": "https://git.kernel.org/stable/c/e1e2194cc725ec1d41f9412496212f0fa0519c36" }, { "url": "https://git.kernel.org/stable/c/ca39545cf07c142b39d474a1439a046bf28def3d" }, { "url": "https://git.kernel.org/stable/c/3243543592425beec83d453793e9d27caa0d8e66" } ], "title": "batman-adv: reject new tp_meter sessions during teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }