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---
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade perfUpgrade kernel-rt-debug-modules-coreUpgrade kernel-rt-debug-develUpgrade kernel-modules-coreUpgrade libperfUpgrade kernel-develUpgrade kernel-debug-develUpgrade kernel-headersUpgrade kernel-zfcpdumpUpgrade kernel-debug-modules-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-debug-uki-virtUpgrade kernel-64k-develUpgrade kernel-modulesUpgrade kernel-debugUpgrade kernel-coreUpgrade kernel-uki-virtUpgrade kernel-modules-extraUpgrade kernel-64k-debug-modulesUpgrade kernel-rt-coreUpgrade kernel-64k-coreUpgrade kernel-rt-debugUpgrade kernel-debug-modulesUpgrade kernel-64k-modules-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-modulesUpgrade kernel-debug-coreUpgrade kernel-rt-modules-coreUpgrade kernel-64k-debug-develUpgrade kernel-rt-debug-modulesUpgrade rtlaUpgrade kernel-zfcpdump-develUpgrade kernel-tools-libsUpgrade kernel-debug-modules-extraUpgrade kernel-docUpgrade kernel-debug-devel-matchedUpgrade kernel-zfcpdump-coreUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-rt-modules-extraUpgrade kernel-devel-matchedUpgrade rvUpgrade kernel-zfcpdump-modulesUpgrade kernel-abi-stablelistsUpgrade kernel-64k-modulesUpgrade kernel-64k-devel-matchedUpgrade kernel-rt-debug-coreUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-develUpgrade kernel-64k-debugUpgrade kernel-toolsUpgrade kernel-tools-libs-develUpgrade python3-perfUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-64k-debug-modules-coreUpgrade kernelUpgrade kernel-cross-headersUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-rtUpgrade bpftoolUpgrade kernel-64kUpgrade kernel-64k-modules-extraUpgrade kernel-64k-debug-core | Nov 4, 2024 | Jun 19, 2024 |
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade perfUpgrade bpftoolUpgrade kernelUpgrade kernel-livepatch-5.10.93-87.444Upgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-4.14.262-200.489Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade python-perfUpgrade perf-debuginfoUpgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64 | Aug 2, 2024 | Jun 19, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 19, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libs | Oct 8, 2024 | Jun 19, 2024 |
| Oracle_linux | — | Upgrade kernel | Oct 16, 2024 | Jun 19, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Dec 5, 2024 | Jun 19, 2024 |
| Rocky_linux | — | Upgrade kernel-tools-libsUpgrade rtlaUpgrade kernel-debug-coreUpgrade python3-perf-debuginfoUpgrade kernel-debug-uki-virtUpgrade python3-perfUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debug-kvmUpgrade kernelUpgrade kernel-debug-develUpgrade kernel-rt-debug-develUpgrade kernel-debuginfoUpgrade kernel-zfcpdump-develUpgrade kernel-rt-modules-extraUpgrade kernel-rt-debug-debuginfoUpgrade kernel-modules-coreUpgrade kernel-cross-headersUpgrade kernel-headersUpgrade kernel-debug-modulesUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-debugUpgrade kernel-debug-modules-coreUpgrade kernel-debug-devel-matchedUpgrade kernel-rt-coreUpgrade kernel-zfcpdump-modules-extraUpgrade bpftool-debuginfoUpgrade kernel-zfcpdumpUpgrade kernel-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-tools-libs-develUpgrade libperf-debuginfoUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-modulesUpgrade kernel-zfcpdump-coreUpgrade kernel-rtUpgrade bpftoolUpgrade kernel-modules-extraUpgrade perfUpgrade kernel-rt-debugUpgrade libperfUpgrade kernel-uki-virtUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-rt-debug-modules-extraUpgrade kernel-devel-matchedUpgrade rvUpgrade kernel-rt-modulesUpgrade kernel-rt-develUpgrade kernel-rt-debuginfoUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-modules-extraUpgrade kernel-debug-debuginfoUpgrade perf-debuginfoUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-kvmUpgrade kernel-rt-modules-core | Aug 22, 2024 | Jun 19, 2024 |
| Ubuntu | — | Upgrade linux-image-4.4.0-1142-kvmUpgrade linux-image-4.4.0-266-lowlatencyUpgrade linux-image-4.4.0-266-genericUpgrade linux-image-4.4.0-1179-awsUpgrade linux-image-lowlatencyUpgrade linux-image-kvmUpgrade linux-image-genericUpgrade linux-image-virtual-lts-xenialUpgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-generic-lts-xenialUpgrade linux-image-4.4.0-1141-awsUpgrade linux-image-virtualUpgrade linux-image-aws | Nov 19, 2024 | Jun 19, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 19, 2024 |
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