Bug 1989216 (CVE-2021-35477) - CVE-2021-35477 kernel: BPF program can obtain sensitive information from kernel memory via a speculative store bypass side-channel attack because the technique used by the BPF verifier to manage speculation is unreliable
Summary: CVE-2021-35477 kernel: BPF program can obtain sensitive information from kern...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-35477
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1989217 1989782 1989783 1989801
Blocks: 1989218
TreeView+ depends on / blocked
 
Reported: 2021-08-02 16:44 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-04-17 21:31 UTC (History)
44 users (show)

Fixed In Version: kernel 5.14-rc4
Doc Type: If docs needed, set a value
Doc Text:
A flaw in the Linux kernel allows a privileged BPF program to obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel in the eBPF subsystem
Clone Of:
Environment:
Last Closed: 2021-11-08 01:52:50 UTC


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Description Guilherme de Almeida Suckevicz 2021-08-02 16:44:55 UTC
A flaw in the Linux kernel allows a privileged BPF program to obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.

References:
https://www.openwall.com/lists/oss-security/2021/08/01/3
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee

Comment 1 Guilherme de Almeida Suckevicz 2021-08-02 16:45:35 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1989217]


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