{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52934", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.369Z", "datePublished": "2026-06-24T07:14:25.321Z", "dateUpdated": "2026-08-05T12:31:52.290Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:52.290Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tvlv: reject oversized TVLV packets\n\nbatadv_tvlv_container_ogm_append() builds a TVLV packet section from\nthe tvlv.container_list. The total size of this section is computed by\nbatadv_tvlv_container_list_size(), which sums the sizes of all registered\ncontainers.\n\nThe return type and accumulator in batadv_tvlv_container_list_size() were\nu16. If the accumulated size exceeds U16_MAX, the value wraps around,\ncausing the subsequent allocation in batadv_tvlv_container_ogm_append()\nto be undersized. The memcpy-style copy that follows would then write\nbeyond the end of the allocated buffer, corrupting kernel memory.\n\nFix this by widening the return type of batadv_tvlv_container_list_size()\nto size_t. In batadv_tvlv_container_ogm_append(), check the computed length\nagainst U16_MAX before proceeding, and bail out as if the allocation had\nfailed when the limit is exceeded." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - batman-adv is a layer-2 mesh/bridge subsystem, and the defensible remote path is from an attached same-link client or mesh segment causing local TT TVLV growth before periodic OGM generation. This is adjacent-network reachability rather than a routable Internet service.\nAC:L - Once on the L2 segment in a vulnerable high-MTU/fragmentation deployment, the attacker can repeatedly emit frames with many source MACs and wait for the periodic OGM append path. No race or probabilistic condition is required.\nPR:N - The attacker does not need a local account or kernel privileges on the vulnerable system in the adjacent-client scenario. Administrative netlink privileges are needed to deploy/configure batman-adv, but not to trigger TT learning on an already deployed node.\nUI:N - No victim user action is required after the vulnerable batman-adv node is configured and active. OGM generation is periodic kernel work.\nS:U - The corruption occurs in the vulnerable host kernel and affects resources under the same kernel security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary.\nC:H - The bug is a kernel heap out-of-bounds write from an undersized kmalloc buffer, with attacker-influenced TVLV/TT data. Such memory corruption is reasonably exploitable for information disclosure, so confidentiality is High.\nI:H - The memcpy-style overflow corrupts adjacent kernel heap memory and can plausibly be shaped into arbitrary write or code execution. Out-of-bounds kernel writes are scored as High integrity impact.\nA:H - Even without full exploitation, the heap overflow can corrupt kernel memory and crash or panic the system. Availability impact is therefore High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/tvlv.c" ], "versions": [ { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "c02aa6c0c9d1bea9bb75dea362b75ad225137bae", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "1595628a2f877d052eda18865ccf539392c47c04", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "6448a49344e87487b61bd88cb850cd694a0f576d", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "13493b00dd1e05a705981e052158652ea23eb482", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "94db72e9dac202e017ee3db22c59d17e4f3bf171", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "ede47988ac5687793745b17c1634a496a2299919", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "94a3d72cd9b21116d7c6d5bdc57c11401fc28557", "status": "affected", "versionType": "git" }, { "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3", "lessThan": "f50487e3566358b2b982b7801945e858c78ad9ab", "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/tvlv.c" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "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": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "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": "3.13", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c02aa6c0c9d1bea9bb75dea362b75ad225137bae" }, { "url": "https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04" }, { "url": "https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d" }, { "url": "https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482" }, { "url": "https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171" }, { "url": "https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919" }, { "url": "https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557" }, { "url": "https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab" } ], "title": "batman-adv: tvlv: reject oversized TVLV packets", "x_generator": { "engine": "bippy-1.2.0" } } } }