CVE-2021-46974

Katalog CVE

CVSS 5.5 · Medium EPSS 0,25%

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: bpf: Fix masking negation logic upon negative dst register The negation logic for the case where the off_reg is sitting in the dst register is not correct given then we cannot just invert the add to a sub or vice versa. As a fix, perform the final bitwise and-op unconditionally into AX from the off_reg, then move the pointer from the src to dst and finally use AX as the source for the original pointer arithmetic operation such that the inversion yields a correct result. The single non-AX mov in between is possible given constant blinding is retaining it as it's not an immediate based operation.

Rincian

Terbit di NVD

27 Februari 2024

Terakhir diubah

4 Agustus 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)

0,25% peluang dieksploitasi; lebih tinggi dari 15,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c patch
• https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d patch
• https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba patch
• https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848 patch
• https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc patch
• https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66 patch
• https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807 patch