266 lines
14 KiB
JSON
266 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-2026-98555",
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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": "2026-09-25T10:25:14.357Z",
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"datePublished": "2026-10-18T15:18:22.631Z",
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"dateUpdated": "2026-10-24T14:09:24.593Z"
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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": "2026-10-24T14:09:24.593Z"
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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\nllc: fix skb UAF and leaks on llc_mac_hdr_init() failure\n\nIn llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()\nfails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks\nthe newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),\nand double-frees skb when llc_conn_state_process() drops its reference.\n\nIn llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is\nleaked if llc_mac_hdr_init() returns an error.\n\nFree nskb in all three error paths."
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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:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.5,
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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 - An adjacent peer can send an IEEE 802.2 LLC2 I-format response with F=1 and N(S)=vR; llc_rcv() through llc_conn_handler() and llc_conn_state_process() reaches the patched action in AWAIT or AWAIT_REJ. LLC2 frames require the same VLAN or Layer-2 domain.\nAC:H - The peer can establish via SABME and withhold replies until the poll timer creates AWAIT, but the UAF also requires llc_mac_hdr_init() to fail. On the relevant VLAN path this requires skb_cow_head() to return -ENOMEM or an admin-driven device/headroom change, which the Layer-2 peer cannot reliably control.\nPR:N - llc_rcv() and llc_conn_handler() perform no peer authentication; a peer can send SABME and the triggering I response without local credentials. CAP_NET_RAW in llc_ui_create() constrains the host process creating the listener, not the remote peer.\nUI:N - Once the LLC listener exists, llc_conn_handler() creates and drives the incoming socket before userspace accept(), while the peer supplies the SABME, waits for the timer state, and sends the triggering I response. No further victim action is required.\nS:U - llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr() corrupts an skb owned by the host LLC stack, and all resulting effects remain within the same host-kernel security authority.\nC:H - The erroneous kfree_skb(skb) leaves pdu dangling, after which LLC_I_GET_NR(pdu) reads the freed object and llc_conn_state_process() continues using the same skb. Reuse of that slab object can expose attacker-influenced kernel memory.\nI:H - After the action frees the incoming skb, llc_conn_state_process() later calls kfree_skb(skb) again. Reallocation between these operations permits freed-object manipulation and allocator corruption capable of write or control-flow impact.\nA:H - The use-after-free culminates in a second kfree_skb() of the received frame in llc_conn_state_process(), which can cause a kernel oops, allocator failure, or panic."
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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/llc/llc_c_ac.c",
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"net/llc/llc_s_ac.c"
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],
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"versions": [
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "fec0fe6838a7f45175667701fb51abb23a6ffb1e",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "b859ba18b5a1067f71db5618c6a4a70d55fa308b",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "8b855b645841b5a04e20339a22bb6d593c9b790d",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "d360b31f1a3666579422872aa7d1a751e20b76f9",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "060f827aa3dc47939ee306da715cd6700d129616",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "41dcae82bece9f106b4dff0ee777bba8d157c8a8",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "cb3528ad8bb46fa6252f5d14ced7febddc18515d",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "72f9dd522f8d6c5a00be9695c7bb74631eb5069e",
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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/llc/llc_c_ac.c",
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"net/llc/llc_s_ac.c"
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],
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"versions": [
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{
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"version": "2.6.12",
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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": "2.6.12",
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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": "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": "6.12.112",
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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": "6.18.55",
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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": "7.2.9",
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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": "2.6.12",
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"versionEndExcluding": "5.10.271"
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"versionEndExcluding": "6.6.158"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/fec0fe6838a7f45175667701fb51abb23a6ffb1e"
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},
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{
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"url": "https://git.kernel.org/stable/c/b859ba18b5a1067f71db5618c6a4a70d55fa308b"
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},
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{
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"url": "https://git.kernel.org/stable/c/8b855b645841b5a04e20339a22bb6d593c9b790d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9"
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},
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{
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"url": "https://git.kernel.org/stable/c/060f827aa3dc47939ee306da715cd6700d129616"
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},
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{
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"url": "https://git.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8"
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},
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{
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"url": "https://git.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515d"
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},
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{
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"url": "https://git.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069e"
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}
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],
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"title": "llc: fix skb UAF and leaks on llc_mac_hdr_init() failure",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |