{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47175","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-03-25T09:12:14.111Z","datePublished":"2024-03-25T09:16:25.995Z","dateUpdated":"2025-05-04T07:05:40.350Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:05:40.350Z"},"descriptions":[{"lang":"en","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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"],"versions":[{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"7a1bdec12e43e29cc34a4394590337069d8812ce","status":"affected","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","lessThan":"e70f7a11876a1a788ceadf75e9e5f7af2c868680","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.10.42","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.9","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.12.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c"},{"url":"https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce"},{"url":"https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680"}],"title":"net/sched: fq_pie: fix OOB access in the traffic path","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47175","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-28T18:24:58.134002Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:14:58.740Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.980Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680","tags":["x_transferred"]}]}]}}