In the Linux kernel, the following vulnerability has been resolved:
nexthop: initialize extack in nh_res_bucket_migrate()
nh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to call_nexthop_res_bucket_notifiers(). When nh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns -ENOMEM), the error is propagated back before any notifier sets extack._msg, and the error path formats the stale pointer with pr_err_ratelimited("%s\n", extack._msg). With CONFIG_INIT_STACK_NONE this dereferences uninitialized stack memory:
Oops: general protection fault, probably for non-canonical address ... KASAN: maybe wild-memory-access in range [...] RIP: 0010:string (lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) _printk (kernel/printk/printk.c:2504) nh_res_bucket_migrate (net/ipv4/nexthop.c:1816) nh_res_table_upkeep (net/ipv4/nexthop.c:1866) rtm_new_nexthop (net/ipv4/nexthop.c:3323) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) netlink_sendmsg (net/netlink/af_netlink.c:1900) Kernel panic - not syncing: Fatal exception
Zero-initialize extack so _msg is NULL on error paths that never set it.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-toolsUpgrade kernel6.12-modules-extra-commonUpgrade bpftool6.12-debuginfoUpgrade perf6.12Upgrade perf6.12-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-modules-extraUpgrade kernel6.12Upgrade kernel6.12-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-headersUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-develUpgrade kernel-livepatch-6.12.103-127.188Upgrade python3-perf6.12-debuginfo | Sep 1, 2026 | Aug 5, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Aug 9, 2026 | Aug 9, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Aug 5, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 14, 2026 | Aug 5, 2026 |
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