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CVE-2021-47606— net: netlink: af_netlink: Prevent empty skb by adding a check on len.

EPSS 0.02% · P6

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxbcbde0d449eda7afa8f63280b165c8300dbd00e2< c54a60c8fbaa774f828e26df79f66229a8a0e010affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< 40cf2e058832d9cfaae98dfd77334926275598b6affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< 54e785f7d5c197bc06dbb8053700df7e2a093cedaffected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< ff3f517bf7138e01a17369042908a3f345c0ee41affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< c0315e93552e0d840e9edc6abd71c7db82ec8f51affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< dadce61247c6230489527cc5e343b6002d1114c5affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< 4c986072a8c9249b9398c7a18f216dc26a9f0e35affected
bcbde0d449eda7afa8f63280b165c8300dbd00e2< f123cffdd8fe8ea6c7fded4b88516a42798797d0affected
… +10 more rows
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I. Basic Information for CVE-2021-47606

Vulnerability Information
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Vulnerability Title
net: netlink: af_netlink: Prevent empty skb by adding a check on len.
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: netlink: af_netlink: Prevent empty skb by adding a check on len. Adding a check on len parameter to avoid empty skb. This prevents a division error in netem_enqueue function which is caused when skb->len=0 and skb->data_len=0 in the randomized corruption step as shown below. skb->data[prandom_u32() % skb_headlen(skb)] ^= 1<<(prandom_u32() % 8); Crash Report: [ 343.170349] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 343.216110] netem: version 1.3 [ 343.235841] divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 343.236680] CPU: 3 PID: 4288 Comm: reproducer Not tainted 5.16.0-rc1+ [ 343.237569] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014 [ 343.238707] RIP: 0010:netem_enqueue+0x1590/0x33c0 [sch_netem] [ 343.239499] Code: 89 85 58 ff ff ff e8 5f 5d e9 d3 48 8b b5 48 ff ff ff 8b 8d 50 ff ff ff 8b 85 58 ff ff ff 48 8b bd 70 ff ff ff 31 d2 2b 4f 74 <f7> f1 48 b8 00 00 00 00 00 fc ff df 49 01 d5 4c 89 e9 48 c1 e9 03 [ 343.241883] RSP: 0018:ffff88800bcd7368 EFLAGS: 00010246 [ 343.242589] RAX: 00000000ba7c0a9c RBX: 0000000000000001 RCX: 0000000000000000 [ 343.243542] RDX: 0000000000000000 RSI: ffff88800f8edb10 RDI: ffff88800f8eda40 [ 343.244474] RBP: ffff88800bcd7458 R08: 0000000000000000 R09: ffffffff94fb8445 [ 343.245403] R10: ffffffff94fb8336 R11: ffffffff94fb8445 R12: 0000000000000000 [ 343.246355] R13: ffff88800a5a7000 R14: ffff88800a5b5800 R15: 0000000000000020 [ 343.247291] FS: 00007fdde2bd7700(0000) GS:ffff888109780000(0000) knlGS:0000000000000000 [ 343.248350] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 343.249120] CR2: 00000000200000c0 CR3: 000000000ef4c000 CR4: 00000000000006e0 [ 343.250076] Call Trace: [ 343.250423] <TASK> [ 343.250713] ? memcpy+0x4d/0x60 [ 343.251162] ? netem_init+0xa0/0xa0 [sch_netem] [ 343.251795] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.252443] netem_enqueue+0xe28/0x33c0 [sch_netem] [ 343.253102] ? stack_trace_save+0x87/0xb0 [ 343.253655] ? filter_irq_stacks+0xb0/0xb0 [ 343.254220] ? netem_init+0xa0/0xa0 [sch_netem] [ 343.254837] ? __kasan_check_write+0x14/0x20 [ 343.255418] ? _raw_spin_lock+0x88/0xd6 [ 343.255953] dev_qdisc_enqueue+0x50/0x180 [ 343.256508] __dev_queue_xmit+0x1a7e/0x3090 [ 343.257083] ? netdev_core_pick_tx+0x300/0x300 [ 343.257690] ? check_kcov_mode+0x10/0x40 [ 343.258219] ? _raw_spin_unlock_irqrestore+0x29/0x40 [ 343.258899] ? __kasan_init_slab_obj+0x24/0x30 [ 343.259529] ? setup_object.isra.71+0x23/0x90 [ 343.260121] ? new_slab+0x26e/0x4b0 [ 343.260609] ? kasan_poison+0x3a/0x50 [ 343.261118] ? kasan_unpoison+0x28/0x50 [ 343.261637] ? __kasan_slab_alloc+0x71/0x90 [ 343.262214] ? memcpy+0x4d/0x60 [ 343.262674] ? write_comp_data+0x2f/0x90 [ 343.263209] ? __kasan_check_write+0x14/0x20 [ 343.263802] ? __skb_clone+0x5d6/0x840 [ 343.264329] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.264958] dev_queue_xmit+0x1c/0x20 [ 343.265470] netlink_deliver_tap+0x652/0x9c0 [ 343.266067] netlink_unicast+0x5a0/0x7f0 [ 343.266608] ? netlink_attachskb+0x860/0x860 [ 343.267183] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.267820] ? write_comp_data+0x2f/0x90 [ 343.268367] netlink_sendmsg+0x922/0xe80 [ 343.268899] ? netlink_unicast+0x7f0/0x7f0 [ 343.269472] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.270099] ? write_comp_data+0x2f/0x90 [ 343.270644] ? netlink_unicast+0x7f0/0x7f0 [ 343.271210] sock_sendmsg+0x155/0x190 [ 343.271721] ____sys_sendmsg+0x75f/0x8f0 [ 343.272262] ? kernel_sendmsg+0x60/0x60 [ 343.272788] ? write_comp_data+0x2f/0x90 [ 343.273332] ? write_comp_data+0x2f/0x90 [ 343.273869] ___sys_sendmsg+0x10f/0x190 [ 343.274405] ? sendmsg_copy_msghdr+0x80/0x80 [ 343.274984] ? slab_post_alloc_hook+0x70/0x230 [ 343.275597] ? futex_wait_setup+0x240/0x240 [ 343.276175] ? security_file_alloc+0x3e/0x170 [ 343.276779] ? write_comp_d ---truncated---
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于af_netlink组件缺少对skb的长度检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux bcbde0d449eda7afa8f63280b165c8300dbd00e2 ~ c54a60c8fbaa774f828e26df79f66229a8a0e010 -
LinuxLinux 3.11 -

II. Public POCs for CVE-2021-47606

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III. Intelligence Information for CVE-2021-47606

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Same Patch Batch · Linux · 2024-06-19 · 122 CVEs total

CVE-2024-38612ipv6: sr: fix invalid unregister error path
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CVE-2021-47583media: mxl111sf: change mutex_init() location
CVE-2021-47579ovl: fix warning in ovl_create_real()
CVE-2021-47580scsi: scsi_debug: Fix type in min_t to avoid stack OOB
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CVE-2021-47576scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()
CVE-2021-47577io-wq: check for wq exit after adding new worker task_work
CVE-2024-38617kunit/fortify: Fix mismatched kvalloc()/vfree() usage
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CVE-2024-38615cpufreq: exit() callback is optional
CVE-2024-38614openrisc: traps: Don't send signals to kernel mode threads
CVE-2024-38613m68k: Fix spinlock race in kernel thread creation
CVE-2024-38611media: i2c: et8ek8: Don't strip remove function when driver is builtin
CVE-2024-38603drivers/perf: hisi: hns3: Actually use devm_add_action_or_reset()
CVE-2024-38601ring-buffer: Fix a race between readers and resize checks
CVE-2024-38600ALSA: Fix deadlocks with kctl removals at disconnection
CVE-2024-38602ax25: Fix reference count leak issues of ax25_dev

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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