CVE-2026-23099
Unknown Unknown - Not Provided
Out-of-Bounds Read in Linux Bonding 8023AD Mode on Ethernet

Publication date: 2026-02-04

Last updated on: 2026-03-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bonding: limit BOND_MODE_8023AD to Ethernet devices BOND_MODE_8023AD makes sense for ARPHRD_ETHER only. syzbot reported: BUG: KASAN: global-out-of-bounds in __hw_addr_create net/core/dev_addr_lists.c:63 [inline] BUG: KASAN: global-out-of-bounds in __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 Read of size 16 at addr ffffffff8bf94040 by task syz.1.3580/19497 CPU: 1 UID: 0 PID: 19497 Comm: syz.1.3580 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 __hw_addr_create net/core/dev_addr_lists.c:63 [inline] __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 __dev_mc_add net/core/dev_addr_lists.c:868 [inline] dev_mc_add+0xa1/0x120 net/core/dev_addr_lists.c:886 bond_enslave+0x2b8b/0x3ac0 drivers/net/bonding/bond_main.c:2180 do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2963 do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3165 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x161c/0x1c90 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg+0x164/0x220 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x1dc/0x560 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e </TASK> The buggy address belongs to the variable: lacpdu_mcast_addr+0x0/0x40
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Meta Information
Published
2026-02-04
Last Modified
2026-03-18
Generated
2026-05-07
AI Q&A
2026-02-04
EPSS Evaluated
2026-05-05
NVD
CVE-2026-23099
Affected Vendors & Products
Showing 11 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.16 (inc) to 6.1.162 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.122 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.68 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.8 (exc)
linux linux_kernel 6.19
linux linux_kernel From 2.6.24 (inc) to 5.15.199 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability exists in the Linux kernel's bonding driver, specifically related to the BOND_MODE_8023AD mode. The issue arises because BOND_MODE_8023AD is intended only for Ethernet devices (ARPHRD_ETHER), but the code did not properly limit its use to these devices. This led to a global out-of-bounds memory access in the function __hw_addr_create within the dev_addr_lists.c file, which was detected by the Kernel Address Sanitizer (KASAN). The out-of-bounds read could cause memory corruption or kernel crashes.


How can this vulnerability impact me? :

The vulnerability can lead to kernel memory corruption or crashes due to out-of-bounds memory access. This can cause system instability, denial of service, or potentially allow an attacker to execute arbitrary code within the kernel context if exploited. Systems using the bonding driver with BOND_MODE_8023AD on non-Ethernet devices are particularly at risk.


How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

I don't know


How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability relates to the Linux kernel bonding driver, specifically the BOND_MODE_8023AD mode being limited to Ethernet devices. Detection would involve checking if the system is using bonding with BOND_MODE_8023AD on non-Ethernet devices.

You can inspect the bonding configuration and current bonding modes using commands such as:

  • cat /proc/net/bonding/bond0 # Replace bond0 with your bonding interface
  • ip link show # To list network interfaces and their states
  • ethtool bond0 # To get detailed information about the bonding interface

Look specifically for bonding mode settings and verify that BOND_MODE_8023AD is only applied to Ethernet devices (ARPHRD_ETHER).


What immediate steps should I take to mitigate this vulnerability?

The vulnerability is fixed by limiting BOND_MODE_8023AD to Ethernet devices only. Immediate mitigation steps include:

  • Verify and ensure that bonding mode 802.3ad (LACP) is only configured on Ethernet devices.
  • Avoid configuring bonding with BOND_MODE_8023AD on non-Ethernet interfaces.
  • Update the Linux kernel to a version that includes the fix for this vulnerability.

These steps will prevent the out-of-bounds memory access issue reported by syzbot.


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