{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46208", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.105Z", "datePublished": "2026-05-28T09:40:26.341Z", "dateUpdated": "2026-08-05T12:30:29.443Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:29.443Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: stop tp_meter sessions during mesh teardown\n\nTP meter sessions remain linked on bat_priv->tp_list after the netlink\nrequest has already finished. When the mesh interface is removed,\nbatadv_mesh_free() currently tears down the mesh without first draining\nthese sessions.\n\nA running sender thread or a late incoming tp_meter packet can then keep\nprocessing against a mesh instance which is already shutting down.\nSynchronize tp_meter with the mesh lifetime by stopping all active\nsessions from batadv_mesh_free() and waiting for sender threads to exit\nbefore teardown continues." } ], "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 controllable trigger is the local `BATADV_CMD_TP_METER` netlink command plus local interface teardown (rtnetlink); the \"late packet\" receiver path is not remotely controllable since the remote peer cannot drive the victim's teardown timing.\nAC:L - The attacker controls both sides of the race—starting a session with an attacker-chosen `test_length` (default 10s) keeps the sender thread/receiver timer alive, then removing the interface triggers the free—giving a large, reliably winnable window.\nPR:L - The tp_meter netlink op is `GENL_UNS_ADMIN_PERM`, i.e. CAP_NET_ADMIN checked against the netns owner's user namespace, which an unprivileged user obtains via `unshare -Urn`.\nUI:N - Both the session start and the mesh teardown are performed by the attacker; no victim interaction is required.\nS:U - The corruption stays within the kernel's own memory/security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free on the netdev private data lets the attacker control freed-object contents and read adjacent/reallocated kernel memory.\nI:H - The freed `bat_priv` object can be reclaimed via heap spraying, yielding a write/control-flow-hijack primitive from the still-running sender thread and receiver timer.\nA:H - The use-after-free reliably causes a kernel oops/panic when the stale `bat_priv` and mesh tables are dereferenced after `free_netdev()`." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/main.c", "net/batman-adv/tp_meter.c", "net/batman-adv/tp_meter.h", "net/batman-adv/types.h" ], "versions": [ { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "5e7d0ac936354c36810e74ac3056b334ed1f4058", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "268078acae72daa12b17b2b299701cb9924e469a", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "58943b7ea356294749dae3e75b96c0ee292c00be", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "79bc0eaeef2c5797317bf2da8e3159a74d62ec47", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "26dfeee8db81354bfdade155f27f9e16510ad196", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "03660dab86f93319178a24667f6998526dc4355d", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "8634c1dbd73adb74d40533ebb7e914efb82e71fb", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "3d3cf6a7314aca4df0a6dde28ce784a2a30d0166", "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/main.c", "net/batman-adv/tp_meter.c", "net/batman-adv/tp_meter.h", "net/batman-adv/types.h" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "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": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.176" }, { "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/5e7d0ac936354c36810e74ac3056b334ed1f4058" }, { "url": "https://git.kernel.org/stable/c/268078acae72daa12b17b2b299701cb9924e469a" }, { "url": "https://git.kernel.org/stable/c/58943b7ea356294749dae3e75b96c0ee292c00be" }, { "url": "https://git.kernel.org/stable/c/79bc0eaeef2c5797317bf2da8e3159a74d62ec47" }, { "url": "https://git.kernel.org/stable/c/26dfeee8db81354bfdade155f27f9e16510ad196" }, { "url": "https://git.kernel.org/stable/c/03660dab86f93319178a24667f6998526dc4355d" }, { "url": "https://git.kernel.org/stable/c/8634c1dbd73adb74d40533ebb7e914efb82e71fb" }, { "url": "https://git.kernel.org/stable/c/3d3cf6a7314aca4df0a6dde28ce784a2a30d0166" } ], "title": "batman-adv: stop tp_meter sessions during mesh teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }