243 lines
15 KiB
JSON
243 lines
15 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-2021-47136",
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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": "2024-03-04T18:12:48.840Z",
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"datePublished": "2024-03-25T09:07:36.064Z",
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"dateUpdated": "2026-08-05T08:46:16.463Z"
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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": "2026-08-05T08:46:16.463Z"
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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: zero-initialize tc skb extension on allocation\n\nFunction skb_ext_add() doesn't initialize created skb extension with any\nvalue and leaves it up to the user. However, since extension of type\nTC_SKB_EXT originally contained only single value tc_skb_ext->chain its\nusers used to just assign the chain value without setting whole extension\nmemory to zero first. This assumption changed when TC_SKB_EXT extension was\nextended with additional fields but not all users were updated to\ninitialize the new fields which leads to use of uninitialized memory\nafterwards. UBSAN log:\n\n[ 778.299821] UBSAN: invalid-load in net/openvswitch/flow.c:899:28\n[ 778.301495] load of value 107 is not a valid value for type '_Bool'\n[ 778.303215] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc7+ #2\n[ 778.304933] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[ 778.307901] Call Trace:\n[ 778.308680] <IRQ>\n[ 778.309358] dump_stack+0xbb/0x107\n[ 778.310307] ubsan_epilogue+0x5/0x40\n[ 778.311167] __ubsan_handle_load_invalid_value.cold+0x43/0x48\n[ 778.312454] ? memset+0x20/0x40\n[ 778.313230] ovs_flow_key_extract.cold+0xf/0x14 [openvswitch]\n[ 778.314532] ovs_vport_receive+0x19e/0x2e0 [openvswitch]\n[ 778.315749] ? ovs_vport_find_upcall_portid+0x330/0x330 [openvswitch]\n[ 778.317188] ? create_prof_cpu_mask+0x20/0x20\n[ 778.318220] ? arch_stack_walk+0x82/0xf0\n[ 778.319153] ? secondary_startup_64_no_verify+0xb0/0xbb\n[ 778.320399] ? stack_trace_save+0x91/0xc0\n[ 778.321362] ? stack_trace_consume_entry+0x160/0x160\n[ 778.322517] ? lock_release+0x52e/0x760\n[ 778.323444] netdev_frame_hook+0x323/0x610 [openvswitch]\n[ 778.324668] ? ovs_netdev_get_vport+0xe0/0xe0 [openvswitch]\n[ 778.325950] __netif_receive_skb_core+0x771/0x2db0\n[ 778.327067] ? lock_downgrade+0x6e0/0x6f0\n[ 778.328021] ? lock_acquire+0x565/0x720\n[ 778.328940] ? generic_xdp_tx+0x4f0/0x4f0\n[ 778.329902] ? inet_gro_receive+0x2a7/0x10a0\n[ 778.330914] ? lock_downgrade+0x6f0/0x6f0\n[ 778.331867] ? udp4_gro_receive+0x4c4/0x13e0\n[ 778.332876] ? lock_release+0x52e/0x760\n[ 778.333808] ? dev_gro_receive+0xcc8/0x2380\n[ 778.334810] ? lock_downgrade+0x6f0/0x6f0\n[ 778.335769] __netif_receive_skb_list_core+0x295/0x820\n[ 778.336955] ? process_backlog+0x780/0x780\n[ 778.337941] ? mlx5e_rep_tc_netdevice_event_unregister+0x20/0x20 [mlx5_core]\n[ 778.339613] ? seqcount_lockdep_reader_access.constprop.0+0xa7/0xc0\n[ 778.341033] ? kvm_clock_get_cycles+0x14/0x20\n[ 778.342072] netif_receive_skb_list_internal+0x5f5/0xcb0\n[ 778.343288] ? __kasan_kmalloc+0x7a/0x90\n[ 778.344234] ? mlx5e_handle_rx_cqe_mpwrq+0x9e0/0x9e0 [mlx5_core]\n[ 778.345676] ? mlx5e_xmit_xdp_frame_mpwqe+0x14d0/0x14d0 [mlx5_core]\n[ 778.347140] ? __netif_receive_skb_list_core+0x820/0x820\n[ 778.348351] ? mlx5e_post_rx_mpwqes+0xa6/0x25d0 [mlx5_core]\n[ 778.349688] ? napi_gro_flush+0x26c/0x3c0\n[ 778.350641] napi_complete_done+0x188/0x6b0\n[ 778.351627] mlx5e_napi_poll+0x373/0x1b80 [mlx5_core]\n[ 778.352853] __napi_poll+0x9f/0x510\n[ 778.353704] ? mlx5_flow_namespace_set_mode+0x260/0x260 [mlx5_core]\n[ 778.355158] net_rx_action+0x34c/0xa40\n[ 778.356060] ? napi_threaded_poll+0x3d0/0x3d0\n[ 778.357083] ? sched_clock_cpu+0x18/0x190\n[ 778.358041] ? __common_interrupt+0x8e/0x1a0\n[ 778.359045] __do_softirq+0x1ce/0x984\n[ 778.359938] __irq_exit_rcu+0x137/0x1d0\n[ 778.360865] irq_exit_rcu+0xa/0x20\n[ 778.361708] common_interrupt+0x80/0xa0\n[ 778.362640] </IRQ>\n[ 778.363212] asm_common_interrupt+0x1e/0x40\n[ 778.364204] RIP: 0010:native_safe_halt+0xe/0x10\n[ 778.365273] Code: 4f ff ff ff 4c 89 e7 e8 50 3f 40 fe e9 dc fe ff ff 48 89 df e8 43 3f 40 fe eb 90 cc e9 07 00 00 00 0f 00 2d 74 05 62 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 64 05 62 00 f4 c3 cc cc 0f 1f 44 00\n[ 778.369355] RSP: 0018:ffffffff84407e48 EFLAGS: 00000246\n[ 778.370570] RAX\n---truncated---"
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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:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
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"baseScore": 8.6,
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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:N - The vulnerable mlx5 paths (mlx5e_tc_update_skb / mlx5e_restore_skb) run on the NIC receive softirq path and attach an uninitialized TC_SKB_EXT when hardware reports a TC chain restore; a remote attacker triggers this by sending packets that miss hardware offload into OVS/TC.\nAC:L - Once the victim runs the intended OVS+mlx5 TC offload deployment, the attacker reliably hits the bug by sending traffic that takes a hardware chain-miss/restore path; no race or attacker-uncontrollable timing is required.\nPR:N - Packet processing on ingress requires no authentication or local privileges; configuring TC/OVS is victim environment setup, not attacker privilege.\nUI:N - No victim user action is needed; received packets alone exercise the restore path and subsequent OVS reads of the uninitialized fields.\nS:U - Impact stays within the host kernel networking/OVS datapath authority; there is no VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:L - Uninitialized slab leftovers for mru (u16) and post_ct (bool) are consumed into OVS flow metadata and can surface via OVS upcalls (e.g. OVS_PACKET_ATTR_MRU); this is a small bounded heap disclosure, not an arbitrary read.\nI:L - Garbage post_ct/mru corrupt conntrack state and MRU used for OVS classification/forwarding/fragmentation decisions, enabling limited mis-handling of packets, but not an arbitrary kernel write or control-flow hijack primitive.\nA:H - A non-zero leftover mru greater than the output MTU causes OVS to drop packets on the miss path, so repeated remote traffic can sustain denial of forwarding for affected datapath flows; under the overestimate rule this is treated as 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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"drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c",
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"drivers/net/ethernet/mellanox/mlx5/core/en_tc.c",
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"include/net/pkt_cls.h",
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"net/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "038ebb1a713d114d54dbf14868a73181c0c92758",
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"lessThan": "ac493452e937b8939eaf2d24cac51a4804b6c20e",
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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": "038ebb1a713d114d54dbf14868a73181c0c92758",
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"lessThan": "86ab133b695ed7ba1f8786b12f4ca43137ad8c18",
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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": "038ebb1a713d114d54dbf14868a73181c0c92758",
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"lessThan": "9453d45ecb6c2199d72e73c993e9d98677a2801b",
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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": "7154bda4cfc1f41b339121475d2b0234141f3492",
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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": "5.7.15",
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"lessThan": "5.8",
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"status": "affected",
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"versionType": "semver"
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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/ethernet/mellanox/mlx5/core/en/rep/tc.c",
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"drivers/net/ethernet/mellanox/mlx5/core/en_tc.c",
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"include/net/pkt_cls.h",
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"net/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "5.9",
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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": "5.9",
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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": "5.10.42",
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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": "5.12.9",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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": "5.9",
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"versionEndExcluding": "5.10.42"
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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": "5.9",
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"versionEndExcluding": "5.12.9"
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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": "5.9",
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"versionEndExcluding": "5.13"
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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": "5.7.15"
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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/ac493452e937b8939eaf2d24cac51a4804b6c20e"
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},
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{
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"url": "https://git.kernel.org/stable/c/86ab133b695ed7ba1f8786b12f4ca43137ad8c18"
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},
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{
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"url": "https://git.kernel.org/stable/c/9453d45ecb6c2199d72e73c993e9d98677a2801b"
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}
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],
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"title": "net: zero-initialize tc skb extension on allocation",
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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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"adp": [
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{
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2024-08-04T05:24:40.228Z"
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},
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ac493452e937b8939eaf2d24cac51a4804b6c20e",
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{
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"url": "https://git.kernel.org/stable/c/86ab133b695ed7ba1f8786b12f4ca43137ad8c18",
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"url": "https://git.kernel.org/stable/c/9453d45ecb6c2199d72e73c993e9d98677a2801b",
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47136",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:55:03.662373Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:33:16.207Z"
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}
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}
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]
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}
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} |