In the Linux kernel, the following vulnerability has been resolved:
netfilter: nftables: avoid overflows in nft_hash_buckets()
Number of buckets being stored in 32bit variables, we have to ensure that no overflows occur in nft_hash_buckets()
syzbot injected a size == 0x40000000 and reported:
UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13 shift exponent 64 is too large for 64-bit type 'long unsigned int' CPU: 1 PID: 29539 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327 __roundup_pow_of_two include/linux/log2.h:57 [inline] nft_hash_buckets net/netfilter/nft_set_hash.c:411 [inline] nft_hash_estimate.cold+0x19/0x1e net/netfilter/nft_set_hash.c:652 nft_select_set_ops net/netfilter/nf_tables_api.c:3586 [inline] nf_tables_newset+0xe62/0x3110 net/netfilter/nf_tables_api.c:4322 nfnetlink_rcv_batch+0xa09/0x24b0 net/netfilter/nfnetlink.c:488 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:612 [inline] nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:630 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade python-perfUpgrade kernel-livepatch-4.14.238-182.421Upgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade perfUpgrade perf-debuginfoUpgrade kernelUpgrade kernel-debuginfo | Dec 12, 2024 | Feb 28, 2024 |
| Amazon_linux | — | Upgrade kernel | Dec 14, 2024 | Feb 28, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Feb 28, 2024 |
| Huawei Euleros 2_0_sp8 | — | Upgrade python-perfUpgrade kernel-tools-libsUpgrade kernel-headersUpgrade kernel-toolsUpgrade bpftoolUpgrade kernelUpgrade python3-perfUpgrade kernel-develUpgrade perf | Jul 23, 2024 | Feb 28, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 28, 2024 |
| Suse | — | Upgrade kernel-symsUpgrade kernel-azure-develUpgrade kernel-macrosUpgrade kernel-default-extraUpgrade kernel-default-manUpgrade kernel-zfcpdumpUpgrade kernel-defaultUpgrade kernel-docsUpgrade kernel-64kb-develUpgrade kernel-default-baseUpgrade kernel-sourceUpgrade kernel-devel-azureUpgrade reiserfs-kmp-defaultUpgrade kernel-preempt-develUpgrade kernel-source-azureUpgrade kernel-64kbUpgrade kernel-default-develUpgrade kernel-azureUpgrade kernel-azure-baseUpgrade kernel-obs-buildUpgrade kernel-syms-azureUpgrade kernel-preemptUpgrade kernel-devel | Aug 9, 2024 | Feb 28, 2024 |
| Ubuntu | — | Upgrade linux-aws-hweUpgrade linux-gcpUpgrade linux-aws-5.4Upgrade linux-aws-fipsUpgrade linux-hwe-5.4Upgrade linux-azureUpgrade linux-gcp-fipsUpgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-kvmUpgrade linux-fipsUpgrade linux-gkeopUpgrade linux-hweUpgrade linux-azure-fipsUpgrade linux-azure-5.4Upgrade linux-raspi-5.4Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-bluefieldUpgrade linux-raspiUpgrade linux-awsUpgrade linux-azure-4.15Upgrade linux-gcp-4.15 | Nov 19, 2024 | Feb 28, 2024 |
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