BUG: Address NUM::fb on device lo is missing its host route.

Status: upstream: reported syz repro on 2026/08/23 15:56
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+57f410c9a4f8d7a441d6@syzkaller.appspotmail.com
First crash: 51d, last: 37d
▶ ▼ ✨ AI Jobs (6)
ID Workflow Result Correct Bug Created Started Finished Revision
c4372cc4 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ BUG: Address NUM::fb on device lo is missing its host route. 2026/09/21 00:03 2026/09/21 00:03 2026/09/21 01:11 853b104b
83ba98f5 assessment-security 💥 BUG: Address NUM::fb on device lo is missing its host route. 2026/09/04 12:20 2026/09/04 12:20 2026/09/04 12:20 801f0966
b0cc0517 assessment-security 💥 BUG: Address NUM::fb on device lo is missing its host route. 2026/08/27 03:07 2026/08/27 03:07 2026/08/27 03:07 a2b77b9e
8117ccb4 assessment-security 💥 BUG: Address NUM::fb on device lo is missing its host route. 2026/08/23 01:06 2026/08/23 01:06 2026/08/23 01:06 1e72964b
b4dcb363 assessment-security 💥 BUG: Address NUM::fb on device lo is missing its host route. 2026/08/21 01:06 2026/08/21 01:06 2026/08/21 01:06 1e72964b
3f4fd0bd assessment-security 💥 BUG: Address NUM::fb on device lo is missing its host route. 2026/08/19 15:44 2026/08/19 15:45 2026/08/19 15:45 1e72964b
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] ipv6: addrconf: drop "BUG: " prefix from pr_warn() 8 (8) 2026/09/28 16:35
[syzbot] BUG: Address NUM::fb on device lo is missing its host route. 0 (2) 2026/09/28 15:18
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 BUG: Address NUM::fb on device lo is missing its host route. -1 syz, C 1 1d12h 43d 0/2 upstream: reported C repro on 2026/08/28 11:58
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/09/28 15:18 12m idosch@nvidia.com patch upstream error job log
2026/09/02 16:56 14m retest repro upstream report job log log

Sample crash report:
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.
IPv6: BUG: Address 2001::fb on device lo is missing its host route.

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/19 15:44 upstream b126f6f5940f 1e72964b .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 BUG: Address NUM::fb on device lo is missing its host route.
* Struck through repros no longer work on HEAD.