Information Exposure Affecting kernel-debuginfo package, versions <0:4.14.238-182.421.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNELDEBUGINFO-1701876
- published 27 Sep 2021
- disclosed 23 Jun 2021
Introduced: 23 Jun 2021
CVE-2021-33624 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel-debuginfo to version 0:4.14.238-182.421.amzn2 or higher.
This issue was patched in ALAS2-2021-1685.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.
References
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db
- http://www.openwall.com/lists/oss-security/2021/06/21/1
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33624
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html