MGASA-2021-0225 - Updated kernel-linus packages fix security vulnerability Publication date: 31 May 2021 URL: https://advisories.mageia.org/MGASA-2021-0225.html Type: security Affected Mageia releases: 7, 8 CVE: CVE-2021-33200 This kernel-linus update is based on upstream 5.10.41 and fixes atleast the following security issue: kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit (CVE-2021-33200). For other upstream fixes, see the referenced changelogs. References: - https://bugs.mageia.org/show_bug.cgi?id=28981 - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38 - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.39 - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.40 - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.41 - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33200 SRPMS: - 8/core/kernel-linus-5.10.41-1.mga8 - 7/core/kernel-linus-5.10.41-1.mga7
Mageia 2021-0225: kernel-linus security update
This kernel-linus update is based on upstream 5.10.41 and fixes atleast the following security issue: kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect l...
Summary
CVE: CVE-2021-33200
This kernel-linus update is based on upstream 5.10.41 and fixes atleast
the following security issue:
kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect
limits for pointer arithmetic operations. This can be abused to perform
out-of-bounds reads and writes in kernel memory, leading to local privilege
escalation to root. In particular, there is a corner case where the off reg
causes a masking direction change, which then results in an incorrect final
aux->alu_limit (CVE-2021-33200).
For other upstream fixes, see the referenced changelogs.
Resolution
MGASA-2021-0225 - Updated kernel-linus packages fix security vulnerability
References
- https://bugs.mageia.org/show_bug.cgi?id=28981
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.39
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.40
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.41
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33200
Severity
Issued Date: 31 May 2021
URL: https://advisories.mageia.org/MGASA-2021-0225.html
Type: security
Affected Mageia releases: 7, 8
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