Bug 1989212 (CVE-2021-34556) - CVE-2021-34556 kernel: BPF program can obtain sensitive information from kernel memory via a speculative store bypass side-channel attack because of the possibility of uninitialized memory locations on the BPF stack
Summary: CVE-2021-34556 kernel: BPF program can obtain sensitive information from kern...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-34556
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: 1989213 1990228 1990229 1990755 1992588
Blocks: 1989214
TreeView+ depends on / blocked
 
Reported: 2021-08-02 16:39 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-07-22 11:46 UTC (History)
45 users (show)

Fixed In Version: kernel 5.14-rc4
Clone Of:
Environment:
Last Closed: 2021-11-08 01:50:56 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-08-02 16:39:52 UTC 
In the Linux kernel an privileged 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.

References:
http://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 16:40:36 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1989213]
Comment 7 juneau 2021-08-09 19:17:27 UTC 
Marking OCP v3-based services affected/ooss, v4 and quay-io affected/delegated.
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