CVE-2021-35477
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 a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <=5.13.7 | |
| Debian | =9.0 | |
| Fedora | =33 | |
| Fedora | =34 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- 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://www.openwall.com/lists/oss-security/2021/08/01/3
- https://launchpad.net/bugs/cve/CVE-2021-35477
- 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://security-tracker.debian.org/tracker/CVE-2021-35477
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35477
- https://nvd.nist.gov/vuln/detail/CVE-2021-35477
- https://ubuntu.com/security/CVE-2021-35477
Frequently Asked Questions
What is the severity of CVE-2021-35477?
CVE-2021-35477 is classified as a medium severity vulnerability due to its potential to leak sensitive information from kernel memory.
How do I fix CVE-2021-35477?
To fix CVE-2021-35477, upgrade to a patched version of the Linux kernel beyond 5.13.7 or apply the relevant security patch if available.
Which versions of the Linux kernel are affected by CVE-2021-35477?
CVE-2021-35477 affects the Linux kernel versions through 5.13.7 inclusive.
Can CVE-2021-35477 be exploited remotely?
CVE-2021-35477 is primarily a local vulnerability and requires an unprivileged user to run a specially crafted BPF program to exploit it.
Is Debian Linux 9.0 vulnerable to CVE-2021-35477?
Yes, Debian Linux 9.0 is affected by CVE-2021-35477 and should be updated to a version with the relevant patches.
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- version/fedora/33
- version/fedora/34