CVE-2026-46208

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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\u2014starting a session with an attacker-chosen `test_length` (default 10s) keeps the sender thread/receiver timer alive, then removing the interface triggers the free\u2014giving 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"}, 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{}

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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."}], "id": "CVE-2026-46208", "lastModified": "2026-06-19T13:16:35.580", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-28T10:16:36.457", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03660dab86f93319178a24667f6998526dc4355d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/268078acae72daa12b17b2b299701cb9924e469a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/26dfeee8db81354bfdade155f27f9e16510ad196"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d3cf6a7314aca4df0a6dde28ce784a2a30d0166"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/58943b7ea356294749dae3e75b96c0ee292c00be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5e7d0ac936354c36810e74ac3056b334ed1f4058"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79bc0eaeef2c5797317bf2da8e3159a74d62ec47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8634c1dbd73adb74d40533ebb7e914efb82e71fb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: stop tp_meter sessions during mesh teardown", "id": "2482585", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482585"}, "csaw": false, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's `batman-adv` module. When a mesh interface is removed, the `batadv_mesh_free()` function does not properly stop `tp_meter` sessions. This oversight allows active `tp_meter` sender threads or late incoming packets to continue processing against a mesh instance that is in the process of shutting down. This can lead to system instability and a denial of service (DoS)."], "name": "CVE-2026-46208", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46208\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46208\nhttps://lore.kernel.org/linux-cve-announce/2026052834-CVE-2026-46208-6e48@gregkh/T"]}

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