221 lines
14 KiB
JSON
221 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-2021-47175",
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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": "2024-03-25T09:12:14.111Z",
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"datePublished": "2024-03-25T09:16:25.995Z",
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"dateUpdated": "2026-08-05T08:46:29.396Z"
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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": "2026-08-05T08:46:29.396Z"
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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/sched: fq_pie: fix OOB access in the traffic path\n\nthe following script:\n\n # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2\n # tc qdisc add dev eth0 clsact\n # tc filter add dev eth0 egress matchall action skbedit priority 0x10002\n # ping 192.0.2.2 -I eth0 -c2 -w1 -q\n\nproduces the following splat:\n\n BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n Read of size 4 at addr ffff888171306924 by task ping/942\n\n CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n dump_stack+0x92/0xc1\n print_address_description.constprop.7+0x1a/0x150\n kasan_report.cold.13+0x7f/0x111\n fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n __dev_queue_xmit+0x1034/0x2b10\n ip_finish_output2+0xc62/0x2120\n __ip_finish_output+0x553/0xea0\n ip_output+0x1ca/0x4d0\n ip_send_skb+0x37/0xa0\n raw_sendmsg+0x1c4b/0x2d00\n sock_sendmsg+0xdb/0x110\n __sys_sendto+0x1d7/0x2b0\n __x64_sys_sendto+0xdd/0x1b0\n do_syscall_64+0x3c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7fe69735c3eb\n Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa 48 8d 05 75 42 2c 00 41 89 ca 8b 00 85 c0 75 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 75 c3 0f 1f 40 00 41 57 4d 89 c7 41 56 41 89\n RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb\n RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003\n RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260\n R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0\n\n Allocated by task 917:\n kasan_save_stack+0x19/0x40\n __kasan_kmalloc+0x7f/0xa0\n __kmalloc_node+0x139/0x280\n fq_pie_init+0x555/0x8e8 [sch_fq_pie]\n qdisc_create+0x407/0x11b0\n tc_modify_qdisc+0x3c2/0x17e0\n rtnetlink_rcv_msg+0x346/0x8e0\n netlink_rcv_skb+0x120/0x380\n netlink_unicast+0x439/0x630\n netlink_sendmsg+0x719/0xbf0\n sock_sendmsg+0xe2/0x110\n ____sys_sendmsg+0x5ba/0x890\n ___sys_sendmsg+0xe9/0x160\n __sys_sendmsg+0xd3/0x170\n do_syscall_64+0x3c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n The buggy address belongs to the object at ffff888171306800\n which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 36 bytes to the right of\n 256-byte region [ffff888171306800, ffff888171306900)\n The buggy address belongs to the page:\n page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306\n head:00000000bcfb624e order:1 compound_mapcount:0\n flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc\n >ffff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ^\n ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nfix fq_pie traffic path to avoid selecting 'q->flows + q->flows_cnt' as a\nvalid flow: it's an address beyond the allocated memory."
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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 - The vulnerability is in the fq_pie qdisc traffic path, reached after configuring the qdisc via tc/netlink and sending packets; kernel guidance classifies tc/qdisc bugs as Local.\nAC:L - An attacker who installs fq_pie can reliably force the OOB index by hashing into the last flow, or by setting skb priority/classid to flows_cnt (e.g. skbedit), with no conditions outside their control.\nPR:L - Creating and configuring fq_pie requires CAP_NET_ADMIN, which is obtainable in a user namespace via netlink_ns_capable(net->user_ns), so privileges are Low rather than High.\nUI:N - Once the attacker has CAP_NET_ADMIN in their userns, they can create the qdisc and trigger the OOB themselves by transmitting packets; no victim interaction is required.\nS:U - Exploitation corrupts kernel heap memory and can escalate privileges within the same kernel authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug performs an out-of-bounds read of an entire fq_pie_flow (~100+ bytes) past the flows array into adjacent slab memory, and the resulting heap corruption can be leveraged for further information disclosure.\nI:H - Every hit writes out-of-bounds (at least accu_prob on the drop path), and the enqueue path performs flow_queue_add and list_add_tail on the OOB flow, enabling classic kernel heap list corruption and arbitrary write primitives.\nA:H - The OOB access causes a KASAN-detectable slab-out-of-bounds fault and can oops/panic the kernel, fully impacting 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/sched/sch_fq_pie.c"
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],
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"versions": [
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{
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"version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
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"lessThan": "e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c",
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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": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
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"lessThan": "7a1bdec12e43e29cc34a4394590337069d8812ce",
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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": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
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"lessThan": "e70f7a11876a1a788ceadf75e9e5f7af2c868680",
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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/sched/sch_fq_pie.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "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": "5.6",
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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": "5.6",
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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": "5.6",
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"versionEndExcluding": "5.13"
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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/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce"
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},
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{
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"url": "https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680"
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}
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],
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"title": "net/sched: fq_pie: fix OOB access in the traffic path",
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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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"title": "CISA ADP Vulnrichment",
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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-2021-47175",
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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": "2024-03-28T18:24:58.134002Z"
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}
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}
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}
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],
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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": "2024-06-04T17:14:58.740Z"
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}
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},
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{
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"shortName": "CVE",
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"dateUpdated": "2024-08-04T05:24:39.980Z"
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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/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c",
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"tags": [
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"url": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce",
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} |