CVE-2021-47327

Katalog CVE

CVSS 7.1 · High EPSS 0,26%

Kerentanan Improper Update of Reference Count pada linux kernel. Skor CVSS 3.1 7.1 (High) menurut CISA ADP.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0. The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak. Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.

Rincian

Terbit di NVD

21 Mei 2024

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-911: Improper Update of Reference Count

EPSS (30 hari)

0,26% peluang dieksploitasi; lebih tinggi dari 15,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d patch
• https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f patch
• https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 patch
• https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 patch
• https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a patch