138 lines
7.5 KiB
JSON
138 lines
7.5 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-2022-49234",
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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": "2025-02-26T01:49:39.294Z",
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"datePublished": "2025-02-26T01:55:59.615Z",
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"dateUpdated": "2026-08-05T08:54:26.338Z"
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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": "2026-08-05T08:54:26.338Z"
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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: Avoid cross-chip syncing of VLAN filtering\n\nChanges to VLAN filtering are not applicable to cross-chip\nnotifications.\n\nOn a system like this:\n\n.-----. .-----. .-----.\n| sw1 +---+ sw2 +---+ sw3 |\n'-1-2-' '-1-2-' '-1-2-'\n\nBefore this change, upon sw1p1 leaving a bridge, a call to\ndsa_port_vlan_filtering would also be made to sw2p1 and sw3p1.\n\nIn this scenario:\n\n.---------. .-----. .-----.\n| sw1 +---+ sw2 +---+ sw3 |\n'-1-2-3-4-' '-1-2-' '-1-2-'\n\nWhen sw1p4 would leave a bridge, dsa_port_vlan_filtering would be\ncalled for sw2 and sw3 with a non-existing port - leading to array\nout-of-bounds accesses and crashes on mv88e6xxx."
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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 - Exploitation requires local netlink/ioctl bridge configuration (enslave a DSA user port then leave the bridge); the buggy path is not reachable from remote packet processing.\nAC:L - On a multi-chip DSA fabric with unequal port counts (the severe but realistic deployment), an attacker who can configure bridges can reliably trigger the OOB by enabling vlan_filtering, joining a high-indexed port, then removing it—no conditions outside attacker control.\nPR:L - Triggering requires CAP_NET_ADMIN to manipulate bridge membership of DSA ports; per kernel CNA guidance that capability is treated as Low when obtainable in a user/network namespace that holds those ports, not full init-namespace root beyond that.\nUI:N - The attacker performs the bridge join/leave operations themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel/DSA subsystem; this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - The bug is an out-of-bounds access on the dsa_switch flexible ports array (and related structures), which reads past the allocation and can disclose adjacent kernel memory.\nI:H - For drivers without vlan_filtering_is_global (including mv88e6xxx), dsa_port_vlan_filtering writes dp->vlan_filtering through the OOB port pointer, producing an out-of-bounds write exploitable for memory corruption.\nA:H - The same OOB/NULL path causes kernel oops/crashes on mv88e6xxx and peer switches when a non-existent port index is used, fully disrupting system availability."
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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/dsa/switch.c"
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],
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"versions": [
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{
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"version": "d371b7c92d190448f3ccbf082c90bf929285f648",
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"lessThan": "e1f2a4dd8d433eec393d09273a78a3d3551339cf",
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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": "d371b7c92d190448f3ccbf082c90bf929285f648",
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"lessThan": "108dc8741c203e9d6ce4e973367f1bac20c7192b",
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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/dsa/switch.c"
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],
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"versions": [
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{
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"version": "5.2",
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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": "5.2",
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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": "5.17.2",
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"lessThanOrEqual": "5.17.*",
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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": "5.18",
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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": "5.2",
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"versionEndExcluding": "5.17.2"
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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": "5.2",
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"versionEndExcluding": "5.18"
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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/e1f2a4dd8d433eec393d09273a78a3d3551339cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/108dc8741c203e9d6ce4e973367f1bac20c7192b"
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}
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],
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"title": "net: dsa: Avoid cross-chip syncing of VLAN filtering",
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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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} |