Description
In the Linux kernel, the following vulnerability has been resolved: netdev-genl: report NAPI thread PID in the caller's pid namespace netdev_nl_napi_fill_one() reports the NAPI kthread PID in NETDEV_A_NAPI_PID using task_pid_nr(), which returns the PID in the initial pid namespace. NETDEV_CMD_NAPI_GET does not have GENL_ADMIN_PERM and the netdev genl family is netnsok, so a caller in a child pid namespace can issue it. That caller then sees the kthread's global PID, even though the kthread is not visible in its pid namespace, where the value should be 0. Translate the PID through the caller's pid namespace, the same way commit 3799c2570982 ("io_uring/fdinfo: translate SqThread PID through caller's pid_ns") did for the io_uring SQPOLL thread. The doit and dumpit paths both run synchronously in the caller's context, so task_active_pid_ns(current) is the caller's pid namespace.
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
db4704f4e4dfce835e934609fca735a648ce26e8 to < fb18095389fe81f140d39585a2624aca9d42227eaffecteddb4704f4e4dfce835e934609fca735a648ce26e8 to < 5e4c8e08ce95730c87d6ada0bdbe1131a3c06393affecteddb4704f4e4dfce835e934609fca735a648ce26e8 to < fd750b694f1f9e1ecb8ca19314e4e21edbb15f42affecteddb4704f4e4dfce835e934609fca735a648ce26e8 to < 1f24c0d01db214c9e661915e9972404c96ca73c0affected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected