The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.
References
Link | Resource |
---|---|
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html | Third Party Advisory VDB Entry |
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html | Third Party Advisory VDB Entry |
http://www.openwall.com/lists/oss-security/2021/03/23/2 | Mailing List Third Party Advisory |
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809 | Mailing List Patch Vendor Advisory |
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html | Mailing List Third Party Advisory |
https://security.netapp.com/advisory/ntap-20210416-0006/ | Third Party Advisory |
https://www.openwall.com/lists/oss-security/2021/03/23/2 | Mailing List Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: canonical
Published: 2021-03-23T00:00:00
Updated: 2021-11-12T18:06:17
Reserved: 2021-03-16T00:00:00
Link: CVE-2021-3444
JSON object: View
NVD Information
Status : Analyzed
Published: 2021-03-23T18:15:13.627
Modified: 2021-12-02T19:37:08.323
Link: CVE-2021-3444
JSON object: View
Redhat Information
No data.