CVEvulnerability

CVE-2021-34556

5.5 MEDIUM Published 2021-08-02 Modified 2026-10-08 Official page ↗
Status
Modified
Published
2021-08-02
Last modified
2026-10-08
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected])
2.1 LOW — AV:L/AC:L/Au:N/C:P/I:N/A:N
Weaknesses
CWE-203

Description

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

Affected configurations

• linux linux kernel (<= 5.13.7) • fedoraproject fedora 33 • fedoraproject fedora 34 • debian debian linux 9.0

Related

Weakness · CWE (1)

  • CWE-203 Observable Discrepancy weakness

References