CVE-2022-48691: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: clean up hook list when offload flags check fails splice back the hook list so nft_chain_release_hook() has a chance to release the hooks. BUG: memory leak unreferenced object 0xffff88810180b100 (size 96): comm "syz-executor133", pid 3619, jiffies 4294945714 (age 12.690s) hex dump (first 32 bytes): 28 64 23 02 81 88 ff ff 28 64 23 02 81 88 ff ff (d#.....(d#..... 90 a8 aa 83 ff ff ff ff 00 00 b5 0f 81 88 ff ff ................ backtrace: [<ffffffff83a8c59b>] kmalloc include/linux/slab.h:600 [inline] [<ffffffff83a8c59b>] nft_netdev_hook_alloc+0x3b/0xc0 net/netfilter/nf_tables_api.c:1901 [<ffffffff83a9239a>] nft_chain_parse_netdev net/netfilter/nf_tables_api.c:1998 [inline] [<ffffffff83a9239a>] nft_chain_parse_hook+0x33a/0x530 net/netfilter/nf_tables_api.c:2073 [<ffffffff83a9b14b>] nf_tables_addchain.constprop.0+0x10b/0x950 net/netfilter/nf_tables_api.c:2218 [<ffffffff83a9c41b>] nf_tables_newchain+0xa8b/0xc60 net/netfilter/nf_tables_api.c:2593 [<ffffffff83a3d6a6>] nfnetlink_rcv_batch+0xa46/0xd20 net/netfilter/nfnetlink.c:517 [<ffffffff83a3db79>] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:638 [inline] [<ffffffff83a3db79>] nfnetlink_rcv+0x1f9/0x220 net/netfilter/nfnetlink.c:656 [<ffffffff83a13b17>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] [<ffffffff83a13b17>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345 [<ffffffff83a13fd6>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921 [<ffffffff83865ab6>] sock_sendmsg_nosec net/socket.c:714 [inline] [<ffffffff83865ab6>] sock_sendmsg+0x56/0x80 net/socket.c:734 [<ffffffff8386601c>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2482 [<ffffffff8386a918>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536 [<ffffffff8386aaa8>] __sys_sendmsg+0x88/0x100 net/socket.c:2565 [<ffffffff845e5955>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845e5955>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Is your site exposed to CVE-2022-48691?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.5 — 5.10.143
linux	linux_kernel	5.11 — 5.15.68
linux	linux_kernel	5.16 — 5.19.9

References

Advisories & Patches

https://git.kernel.org/stable/c/1ce55ec5cb7c573c983dffbe290b8d17caf1f157 https://git.kernel.org/stable/c/77972a36ecc4db7fc7c68f0e80714263c5f03f65 https://git.kernel.org/stable/c/910891a2a44cdc49efcc4fe7459c1085ba00d0f4 https://git.kernel.org/stable/c/94ed8eeb8d9aeb00e4f4e19b83a2e28b6442fbc5 https://git.kernel.org/stable/c/1ce55ec5cb7c573c983dffbe290b8d17caf1f157 https://git.kernel.org/stable/c/77972a36ecc4db7fc7c68f0e80714263c5f03f65 https://git.kernel.org/stable/c/910891a2a44cdc49efcc4fe7459c1085ba00d0f4 https://git.kernel.org/stable/c/94ed8eeb8d9aeb00e4f4e19b83a2e28b6442fbc5

Frequently Asked Questions

What is CVE-2022-48691? +

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: clean up hook list when offload flags check fails splice back the hook list so nft_chain_release_hook() has a chance to release the hooks. BUG: memory leak unreferenced object 0xffff88810180b100 (size 96): comm "syz-executor133", pid 3619, jiffies 4294945714 (age 12.690s) hex dump (first 32 bytes): 28 64 23 02 81 88 ff ff 28 64 23 02 81 88 ff ff (d#.....(d#..... 90 a8 aa 83 ff ff ff ff 00 00 b5 0f 81 88 ff ff ................ backtrace: [<ffffffff83a8c59b>] kmalloc include/linux/slab.h:600 [inline] [<ffffffff83a8c59b>] nft_netdev_hook_alloc+0x3b/0xc0 net/netfilter/nf_tables_api.c:1901 [<ffffffff83a9239a>] nft_chain_parse_netdev net/netfilter/nf_tables_api.c:1998 [inline] [<ffffffff83a9239a>] nft_chain_parse_hook+0x33a/0x530 net/netfilter/nf_tables_api.c:2073 [<ffffffff83a9b14b>] nf_tables_addchain.constprop.0+0x10b/0x950 net/netfilter/nf_tables_api.c:2218 [<ffffffff83a9c41b>] nf_tables_newchain+0xa8b/0xc60 net/netfilter/nf_tables_api.c:2593 [<ffffffff83a3d6a6>] nfnetlink_rcv_batch+0xa46/0xd20 net/netfilter/nfnetlink.c:517 [<ffffffff83a3db79>] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:638 [inline] [<ffffffff83a3db79>] nfnetlink_rcv+0x1f9/0x220 net/netfilter/nfnetlink.c:656 [<ffffffff83a13b17>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] [<ffffffff83a13b17>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345 [<ffffffff83a13fd6>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921 [<ffffffff83865ab6>] sock_sendmsg_nosec net/socket.c:714 [inline] [<ffffffff83865ab6>] sock_sendmsg+0x56/0x80 net/socket.c:734 [<ffffffff8386601c>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2482 [<ffffffff8386a918>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536 [<ffffffff8386aaa8>] __sys_sendmsg+0x88/0x100 net/socket.c:2565 [<ffffffff845e5955>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845e5955>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48691? +

CVE-2022-48691 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-48691? +

CVE-2022-48691 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-48691? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-0646

A denial-of-service security issue exists within the 1794-AENTR adapter due to improper memory handling of CIP protocol requests. This vulnerability …

CVE-2026-20746

Virtual attribute handling in Ping Identity PingDirectory in affected versions allows only authorized users to exhaust java memory heap when …

CVE-2026-53429

Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdex_native allows an attacker who controls a rendered …

CVE-2024-25450 8.8

imlib2 v1.9.1 was discovered to mishandle memory allocation in the function init_imlib_fonts().

CVE-2025-20133 8.6

A vulnerability in the management and VPN web servers of the Remote Access SSL VPN feature of Cisco Secure Firewall …

CVE-2025-20239 8.6

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure Firewall …

CVE-2022-48691