CVE-2021-47223

Katalog CVE

CVSS 5.5 · Medium EPSS 0,24%

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

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.

Rincian

Terbit di NVD

21 Mei 2024

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

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

Jenis kelemahan (CWE)

CWE-476: NULL Pointer Dereference

EPSS (30 hari)

0,24% peluang dieksploitasi; lebih tinggi dari 13,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530 patch
• https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f patch
• https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c patch
• https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d patch
• https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79 patch
• https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7 patch