CVE-2021-34556
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-34556
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-34556.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-34556
- Aliases
-
- A-196011539
- PUB-A-196011539
- Downstream
- Related
- Published
- 2021-08-02T05:15:07Z
- Modified
- 2025-08-09T20:01:27Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- http://www.openwall.com/lists/oss-security/2021/08/01/3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JKK6XNRZX5BT5QVYOKGVJ2BHFZAP5EX/