264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-52934",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.369Z",
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"datePublished": "2026-06-24T07:14:25.321Z",
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"dateUpdated": "2026-08-05T12:31:52.290Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:31:52.290Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/tvlv.c"
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],
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"versions": [
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "c02aa6c0c9d1bea9bb75dea362b75ad225137bae",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "1595628a2f877d052eda18865ccf539392c47c04",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "6448a49344e87487b61bd88cb850cd694a0f576d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "13493b00dd1e05a705981e052158652ea23eb482",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "94db72e9dac202e017ee3db22c59d17e4f3bf171",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "ede47988ac5687793745b17c1634a496a2299919",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "94a3d72cd9b21116d7c6d5bdc57c11401fc28557",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
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"lessThan": "f50487e3566358b2b982b7801945e858c78ad9ab",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/tvlv.c"
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],
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"versions": [
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{
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"version": "3.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.93",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "5.10.259"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "5.15.210"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "6.1.176"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "6.6.143"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "6.12.93"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.13",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c02aa6c0c9d1bea9bb75dea362b75ad225137bae"
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},
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{
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"url": "https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04"
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},
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{
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"url": "https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d"
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},
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{
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"url": "https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482"
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},
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{
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"url": "https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171"
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},
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{
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"url": "https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919"
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},
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{
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"url": "https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557"
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},
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{
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"url": "https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab"
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}
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],
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"title": "batman-adv: tvlv: reject oversized TVLV packets",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |