CVE-2021-47280

Katalog CVE

CVSS 7.0 · High EPSS 0,18%

Kerentanan Time-of-check Time-of-use (TOCTOU) Race Condition pada linux kernel. Skor CVSS 3.1 7.0 (High) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.

Rincian

Terbit di NVD

21 Mei 2024

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-416: Use After Free

EPSS (30 hari)

0,18% peluang dieksploitasi; lebih tinggi dari 7,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 patch
• https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 patch
• https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 patch
• https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 patch
• https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b patch
• https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e patch