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5.5
CVSSv3

CVE-2021-35477

Published: 02/08/2021 Updated: 07/11/2023
CVSS v2 Base Score: 2.1 | Impact Score: 2.9 | Exploitability Score: 3.9
CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8
VMScore: 187
Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N
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Vulnerability Summary

In the Linux kernel up to and including 5.13.7, an unprivileged BPF program can 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.

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Vendor Advisories

Amazon Linux 2: ALAS2KERNEL-5.10-2022-004
A flaw was found in the Linux kernel, where a BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack This issue occurs when the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack The highest threat from this vulnerability is to confidentialit ...
Amazon Linux 2: ALAS2-2021-1696
A flaw was found in the Linux kernel, where an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack This issue occurs when the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack The highest threat from this vulnerability is to ...
Arch Linux Issues:
An issue has been discovered in the Linux kernel mechanism to mitigate Speculative Store Bypass in BPF On affected systems, an unprivileged BPF program can exploit any of these issues to disclose the content of arbitrary kernel memory via a side-channel When protecting memory operations against Speculative Store Bypass, the technique used by the ...

Mailing Lists

Full Disclosure: [CVE-2021-34556,CVE-2021-35477] Linux kernel BPF protection against Speculative Store Bypass can be bypassed to disclose arbitrary kernel memory
<!--X-Body-Begin--> <!--X-User-Header--> oss-sec mailing list archives <!--X-User-Header-End--> <!--X-TopPNI--> By Date By Thread </form> <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> [CVE-2021-34556,CVE-2021-35477] Linux kernel BPF protection against Speculative Store Bypass can be bypassed to disclose arbitr ...

References

CWE-203https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722chttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86eehttps://www.openwall.com/lists/oss-security/2021/08/01/3https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JKK6XNRZX5BT5QVYOKGVJ2BHFZAP5EX/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4/https://nvd.nist.govhttps://alas.aws.amazon.com/AL2/ALASKERNEL-5.10-2022-004.html
CVSSv3
CVSSv2
CVSSv3
VMScore
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