Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
7c37c7e00411b3d1e0c5292368317aca69d1f324 to < eacd2e2117e8682f937967fda1022e7f1c22d91aaffected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < 37bbd7e1d8df0bec3d187e961783e20c30533d2caffected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < c0936c131a71657afc635d0db2ab096d15d473e1affected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < 3081702ea5aca0aeed9c1ade8eadf6cde8db6b7daffected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < d536bf205c71f700f6de2086038c3e1d77724715affected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < 18506d7263768d76ac8e057ba55a4d9da50aad66affected7c37c7e00411b3d1e0c5292368317aca69d1f324 to < 6347c5314cee49f364aaf2e40ff15415a57a116eaffected
Linux Linux
Default version status: affected
5.13affected0 to < 5.13unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.148 to ≤ 6.6.*unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a ↗
- https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c ↗
- https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1 ↗
- https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d ↗
- https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715 ↗
- https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66 ↗
- https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e ↗