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-2026-52919",
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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": "2026-06-09T07:44:35.367Z",
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"datePublished": "2026-06-24T07:14:15.201Z",
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"dateUpdated": "2026-08-05T12:31:41.245Z"
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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": "2026-08-05T12:31:41.245Z"
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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: fix tp_meter counter underflow during shutdown\n\nbatadv_tp_sender_shutdown() unconditionally decrements the \"sending\"\natomic counter. If multiple paths (e.g. timeout, user cancel, and\nnormal finish) call this function, the counter can underflow to -1.\n\nSince the sender logic treats any non-zero value as \"still sending\",\na negative value causes the sender kthread to loop indefinitely.\nThis leads to a use-after-free when the interface is removed while\nthe zombie thread is still active.\n\nFix this by using atomic_xchg() to ensure the counter only transitions\nfrom 1 to 0 once.\n\n[sven: added missing change in batadv_tp_send]"
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The vulnerable sender shutdown path is reached through the batman-adv generic netlink tp_meter start/cancel operations and mesh-interface teardown, which are local kernel control interfaces rather than packets alone. Adjacent mesh packets can influence timing, but an attacker must be able to initiate or cancel the tp_meter session locally to reliably hit the underflow.\nAC:L - The underflow occurs when multiple attacker-controllable stop paths act on the same session, such as a short test/timeout plus cancel or teardown. Although timing is involved, the attacker controls the session lifetime and can repeat the race, so this is low complexity.\nPR:L - The tp_meter genl commands use GENL_UNS_ADMIN_PERM, requiring CAP_NET_ADMIN in the caller's user namespace. Because batman-adv is netns-aware and can be driven from user namespaces when available, this is low rather than high privilege.\nUI:N - A local attacker with the required namespace capability can create/start/cancel/tear down the tp_meter session without any separate victim action. No user needs to open a file, mount anything, or interact with attacker-controlled data.\nS:U - The bug corrupts/uses kernel networking subsystem state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The fix commit states the negative sender counter leaves a zombie kthread active and leads to a use-after-free during interface removal. Per kernel scoring guidance, a kernel UAF is treated as potentially enabling high confidentiality impact.\nI:H - The resulting use-after-free is kernel memory corruption and can plausibly be shaped into write/control-flow primitives in the most severe reasonable scenario. Per guidance, kernel UAFs are scored as high integrity impact.\nA:H - At minimum, the negative counter can keep the sender kthread looping indefinitely and hang teardown; the documented UAF can also crash the kernel. This is high availability impact."
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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/tp_meter.c"
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],
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"versions": [
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "e75e2ab463b5b34df6b98f94d740aff327ce9f6b",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "abae88fa254f2981d39ac003a7b302528a22af64",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "c66d20a3ff095e3f000551d208ec2606616db15c",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "c1bac194733aabd731aafa6a01350c229e187dba",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "01cefc5923889e29dbb5f281c3d457714ceb9c00",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "90ae3eae06b7b8ab9f6250b9497c860915b4c17b",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "aeae11c5dad9cd0d50723890bdd866f8e6db2e7d",
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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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "94f3b133168d1c49895e7cc6afbcf1cc0b354602",
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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/tp_meter.c"
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],
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"versions": [
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{
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"version": "4.8",
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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": "4.8",
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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": "5.10.258",
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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": "5.15.209",
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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": "6.1.175",
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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": "6.6.142",
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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": "6.12.92",
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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": "4.8",
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"versionEndExcluding": "5.10.258"
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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": "4.8",
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"versionEndExcluding": "5.15.209"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.1.175"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.6.142"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.12.92"
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.18.34"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "7.0.11"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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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/e75e2ab463b5b34df6b98f94d740aff327ce9f6b"
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},
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{
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"url": "https://git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64"
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},
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{
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"url": "https://git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15c"
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},
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{
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"url": "https://git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dba"
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},
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{
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"url": "https://git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00"
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},
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{
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"url": "https://git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17b"
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},
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{
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"url": "https://git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7d"
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},
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{
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"url": "https://git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602"
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}
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],
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"title": "batman-adv: fix tp_meter counter underflow during shutdown",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |