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-2026-98027",
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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": "2026-09-25T10:19:56.070Z",
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"datePublished": "2026-09-25T10:23:45.123Z",
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"dateUpdated": "2026-10-19T09:12:32.331Z"
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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": "2026-10-19T09:12:32.331Z"
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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\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR, clobbering the input value before it has been\nlooked at. That input is the number of entries the caller had room for.\nETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the\nbuffer from the rule_cnt userspace passes in, so once an admin has\ninstalled policy rules any user can ask for fewer slots than there are\nrules and run off the end of the allocation. A rule_cnt of 0 leaves the\nbuffer pointer NULL and the walk dereferences it.\n\nCount into a local so the caller's limit survives the walk, and stop with\n-EMSGSIZE once it is reached."
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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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 overflow is reached only through the local SIOCETHTOOL ioctl: dev_ethtool() -> ethtool_get_rxnfc() -> dsa_user_get_rxnfc() -> mv88e6xxx_get_rxnfc(ETHTOOL_GRXCLSRLALL). The bad input is the rule_cnt field of the ethtool_rxnfc struct the user passes in. No network packet reaches this path.\nAC:H - The OOB write only happens if policy rules already exist in chip->policies for that DSA port. Those are installed by an admin via ETHTOOL_SRXCLSRLINS, which needs CAP_NET_ADMIN over the hardware port. The attacker can't create that state. Once rules exist, a small rule_cnt triggers it deterministically.\nPR:L - dev_ethtool() lists ETHTOOL_GRXCLSRLALL among the commands exempt from the ns_capable(CAP_NET_ADMIN) check. Any unprivileged local user who can see the mv88e6xxx user port in their netns can issue the ioctl.\nUI:N - The attacker makes the ioctl call and picks rule_cnt themselves. No other user has to do anything.\nS:U - The corruption hits the kernel heap in the same kernel that runs the attacker's ioctl. No VM, IOMMU or other authority boundary is crossed.\nC:H - ethtool_get_rxnfc() sizes rule_buf with kcalloc(rule_cnt, 4) from the user's value. The driver then overwrites rxnfc->rule_cnt with the real rule count, so ethtool_rxnfc_copy_to_user() copies that many u32s from the undersized buffer, reading past the slab object into userspace. The same heap corruption can also be groomed to leak more.\nI:H - mv88e6xxx_get_rxnfc() writes rule_locs[rxnfc->rule_cnt++] = id for every rule on the port with no bound, so u32 IDs go past a kmalloc object whose size and cache the attacker chose via rule_cnt. That heap OOB write can corrupt neighbouring objects.\nA:H - With rule_cnt=0, ethtool_get_rxnfc() passes a NULL rule_buf and the IDR walk writes through it, oopsing the kernel on demand. Larger overflows corrupt slab memory and can panic the system. Either can be repeated."
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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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"drivers/net/dsa/mv88e6xxx/chip.c"
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],
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"versions": [
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{
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"version": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "7e4bfc5f0b66feb22cba821303fc25ca22cd0887",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "01124cd2cf4b71755b1130ac82d78dcfbd5d69e3",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "609c4378f212cf580aae02250f1146caf63d873f",
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"status": "affected",
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},
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"lessThan": "c5b5c52b6524c9fb50def2260baac745c095ec3a",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "44cd4674d9aa5bdf793b8a8b481c9e8536ed6070",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "7a683c2b062810bca203e41866389daf387c235b",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "cda5ac8fe8ac8e80b1703ebb8c4250726fc19739",
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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": "da7dc87553046a43be1620a783ce3d9f6583d322",
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"lessThan": "b1fffc273112e7284c5b705e186b43b5770cd3d5",
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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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"drivers/net/dsa/mv88e6xxx/chip.c"
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],
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"versions": [
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{
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"version": "5.4",
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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": "5.4",
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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": "5.10.271",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.111",
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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": "6.18.53",
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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": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.4",
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"versionEndExcluding": "5.10.271"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887"
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},
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{
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"url": "https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3"
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},
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{
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"url": "https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f"
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},
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{
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"url": "https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a"
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},
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{
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"url": "https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070"
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},
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{
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"url": "https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b"
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},
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{
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"url": "https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739"
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},
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{
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"url": "https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5"
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}
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],
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"title": "net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size",
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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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} |