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-2026-98030",
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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": "2026-09-25T10:23:46.959Z",
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"dateUpdated": "2026-10-19T09:12:35.325Z"
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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": "2026-10-19T09:12:35.325Z"
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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: bcm_sf2: bound the CFP rule dump by the caller's buffer size\n\nbcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into\nrule_locs[] without consulting nfc->rule_cnt, which is how many entries\nthe caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN\nand the ioctl sizes the buffer from the rule_cnt userspace passes in, so\nonce an admin has installed CFP rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation. A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it."
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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 trigger is the local SIOCETHTOOL ioctl with ETHTOOL_GRXCLSRLALL on a bcm_sf2 DSA user port. The path is ethtool_get_rxnfc() -> dsa_user_get_rxnfc() -> bcm_sf2_get_rxnfc() -> bcm_sf2_cfp_rule_get_all(). The bad rule_cnt comes from userspace, and no packet from a remote peer is involved.\nAC:H - The overflow needs CFP rules installed beyond the default at bit 0 of cfp.unique, since the walk starts at index 1. Installing them via ETHTOOL_SRXCLSRLINS needs CAP_NET_ADMIN over the switch's netns, so the unprivileged attacker cannot create the rule state. Once rules exist, the bug fires every time.\nPR:L - ETHTOOL_GRXCLSRLALL is on ethtool's no-capability list in net/ethtool/ioctl.c, so any unprivileged local user who can open a socket in the netns holding the DSA port can send the dump request.\nUI:N - The attacker issues the ioctl themselves and picks rule_cnt. No other user has to act.\nS:U - Both the memory corruption and the leak stay inside the kernel's own security authority, with no VM or IOMMU boundary crossed.\nC:H - After the walk, nfc->rule_cnt holds the real rule count, which can be larger than the buffer. ethtool_rxnfc_copy_to_user() then copies rule_cnt*4 bytes from the undersized kcalloc buffer to userspace. That leaks up to about 1 KB of adjacent heap from a slab cache the attacker chooses.\nI:H - bcm_sf2_cfp_rule_get_all() writes u32 rule indices past a kcalloc(rule_cnt) buffer sized by the user. This is a heap out-of-bounds write into neighbouring objects in a slab cache the attacker picks, and it can corrupt kernel data structures.\nA:H - With rule_cnt=0 the rule_locs buffer stays NULL, so the walk writes through a NULL pointer and the kernel oopses. Any user can repeat this at will once rules are installed. Heap corruption from the out-of-bounds write can also crash the system."
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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/bcm_sf2_cfp.c"
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],
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"versions": [
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{
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"version": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "8e41ce02589c92356bfd8ef62f6ceff840546e1a",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "f5e93162b3dd195bfda815e8f7a39aaf1d45437b",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "f1a2869b3629c0e8394b77b38cb9f19a018c653c",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "fd1a78c16b1f6978c09cf048e15f349732e4c707",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "b231b6d8516d3fe0d4bba549908e08d26a4531a5",
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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": "7318166cacad158b46240f66250d7cc5a481653b",
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"lessThan": "cdb719f4b8596d9ccee2d56d204c2c4dce982f46",
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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/bcm_sf2_cfp.c"
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],
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"versions": [
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{
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"version": "4.11",
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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": "4.11",
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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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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.11",
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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/ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e41ce02589c92356bfd8ef62f6ceff840546e1a"
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},
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{
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"url": "https://git.kernel.org/stable/c/f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4"
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},
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{
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"url": "https://git.kernel.org/stable/c/f5e93162b3dd195bfda815e8f7a39aaf1d45437b"
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},
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{
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"url": "https://git.kernel.org/stable/c/f1a2869b3629c0e8394b77b38cb9f19a018c653c"
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},
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{
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"url": "https://git.kernel.org/stable/c/fd1a78c16b1f6978c09cf048e15f349732e4c707"
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},
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{
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"url": "https://git.kernel.org/stable/c/b231b6d8516d3fe0d4bba549908e08d26a4531a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/cdb719f4b8596d9ccee2d56d204c2c4dce982f46"
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}
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],
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"title": "net: dsa: bcm_sf2: bound the CFP 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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}
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} |