CVE-2021-34556
First published: Mon Aug 02 2021(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=5.13.7 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 | |
| debian/linux | 5.10.223-1 6.1.106-3 6.1.99-1 6.10.9-1 |
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Reference Links
- 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=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
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6JKK6XNRZX5BT5QVYOKGVJ2BHFZAP5EX/
- https://launchpad.net/bugs/cve/CVE-2021-34556
- 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/
- https://www.openwall.com/lists/oss-security/2021/08/01/3
- https://security-tracker.debian.org/tracker/CVE-2021-34556
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34556
- https://nvd.nist.gov/vuln/detail/CVE-2021-34556
- https://ubuntu.com/security/CVE-2021-34556
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