CVE-2025-71097

Katalog CVE

CVSS 5.5 · Medium EPSS 0,14%

Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: ipv4: Fix reference count leak when using error routes with nexthop objects When a nexthop object is deleted, it is marked as dead and then fib_table_flush() is called to flush all the routes that are using the dead nexthop. The current logic in fib_table_flush() is to only flush error routes (e.g., blackhole) when it is called as part of network namespace dismantle (i.e., with flush_all=true). Therefore, error routes are not flushed when their nexthop object is deleted: # ip link add name dummy1 up type dummy # ip nexthop add id 1 dev dummy1 # ip route add 198.51.100.1/32 nhid 1 # ip route add blackhole 198.51.100.2/32 nhid 1 # ip nexthop del id 1 # ip route show blackhole 198.51.100.2 nhid 1 dev dummy1 As such, they keep holding a reference on the nexthop object which in turn holds a reference on the nexthop device, resulting in a reference count leak: # ip link del dev dummy1 [ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2 Fix by flushing error routes when their nexthop is marked as dead. IPv6 does not suffer from this problem.

Rincian

Terbit di NVD

13 Januari 2026

Terakhir diubah

14 Juli 2026

Status NVD

Modified

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

EPSS (30 hari)

0,14% peluang dieksploitasi; lebih tinggi dari 2,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/30386e090c49e803c0616a7147e43409c32a2b0e patch
• https://git.kernel.org/stable/c/33ff5c207c873215e54e6176624ed57423cb7dea patch
• https://git.kernel.org/stable/c/5979338c83012110ccd45cae6517591770bfe536 patch
• https://git.kernel.org/stable/c/5de7ad7e18356e39e8fbf7edd185a5faaf4f385a patch
• https://git.kernel.org/stable/c/ac782f4e3bfcde145b8a7f8af31d9422d94d172a patch
• https://git.kernel.org/stable/c/e3fc381320d04e4a74311e576a86cac49a16fc43 patch
• https://git.kernel.org/stable/c/ee4183501ea556dca31f5ffd8690aa9fd25b609f patch
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html