CVE-2021-3491

Katalog CVE

CVSS 8.8 · High EPSS 0,64%

Kerentanan Incorrect Calculation of Buffer Size pada linux kernel, canonical ubuntu linux. Skor CVSS 3.1 8.8 (High) menurut NVD.

Deskripsi (NVD)

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).

Rincian

Terbit di NVD

4 Juni 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-131: Incorrect Calculation of Buffer Size
CWE-787: Out-of-bounds Write

EPSS (30 hari)

0,64% peluang dieksploitasi; lebih tinggi dari 49,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb... patch · advisory vendor
• https://www.openwall.com/lists/oss-security/2021/05/11/13 mailing list · patch · advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210716-0004/ advisory pihak ketiga
• https://ubuntu.com/security/notices/USN-4949-1 advisory pihak ketiga
• https://ubuntu.com/security/notices/USN-4950-1 advisory pihak ketiga
• https://www.zerodayinitiative.com/advisories/ZDI-21-589/ advisory pihak ketiga · vdb entry