CVE-2026-53256

Katalog CVE

CVSS 8.0 · High EPSS 0,25%

Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 8.0 (High) menurut CNA.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() rfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock, but returns the selected listener after dropping that lock without taking a reference. rfcomm_connect_ind() then locks the listener, queues a child socket on it, and may notify it after unlocking it. The buggy scenario involves two paths, with each column showing the order within that path: rfcomm_connect_ind(): listener close: 1. Find parent in 1. close() enters rfcomm_get_sock_by_channel() rfcomm_sock_release(). 2. Drop rfcomm_sk_list.lock 2. rfcomm_sock_shutdown() without pinning parent. closes the listener. 3. Call lock_sock(parent) and 3. rfcomm_sock_kill() bt_accept_enqueue(parent, unlinks and puts parent. sk, true). 4. Read parent flags and may 4. parent can be freed. call sk_state_change(). If close wins the race, parent can be freed before rfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the deferred-setup callback. Take a reference on the listener before leaving rfcomm_sk_list.lock. After lock_sock() succeeds, recheck that it is still in BT_LISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use. KASAN reported a slab-use-after-free in lock_sock_nested() from rfcomm_connect_ind(), with the freeing stack going through rfcomm_sock_kill() and rfcomm_sock_release().

Advisory KUTIM-CSIRT

• Peringatan Keamanan: 14 Kerentanan Kernel Linux Periode September 2026 pada Ubuntu, AlmaLinux, dan Debian 30 Sep 2026

Rincian

Terbit di NVD

25 Juni 2026

Terakhir diubah

8 Juli 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,25% peluang dieksploitasi; lebih tinggi dari 14,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/1f73f92f66251065a5f39b09a47cf05ea14d3107 patch
• https://git.kernel.org/stable/c/43c441edacf953b39517a44f5e5e10a93618b226 patch
• https://git.kernel.org/stable/c/6f4462d12133106460d7c046b95aad2491e3fddf patch
• https://git.kernel.org/stable/c/8802413ce63175fb522a2bd609fb043a3550c720 patch
• https://git.kernel.org/stable/c/a07d741c077d4e34b16458241a94d29039386553 patch
• https://git.kernel.org/stable/c/b0e33e409715c617e2a20f46f99aa5403a14dfda patch
• https://git.kernel.org/stable/c/de31973ef00e5aa55496f84cf6a44bb157a34e02 patch
• https://git.kernel.org/stable/c/f5ec76bdbeb80f75ad0be204371afffee0f8fac8 patch