CVE-2021-4002
First published: Mon Nov 22 2021(Updated: )
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-372.9.1.rt7.166.el8 | 0:4.18.0-372.9.1.rt7.166.el8 |
| redhat/kernel | <0:4.18.0-372.9.1.el8 | 0:4.18.0-372.9.1.el8 |
| Linux Linux kernel | <5.16 | |
| Linux Linux kernel | =5.16 | |
| Linux Linux kernel | =5.16-rc1 | |
| Linux Linux kernel | =5.16-rc2 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =35 | |
| Oracle Communications Cloud Native Core Binding Support Function | =22.1.3 | |
| Oracle Communications Cloud Native Core Network Exposure Function | =22.1.1 | |
| Oracle Communications Cloud Native Core Policy | =22.2.0 | |
| redhat/kernel | <5.16 | 5.16 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
Remedy
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-4002 https://nvd.nist.gov/vuln/detail/CVE-2021-4002 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890 https://www.openwall.com/lists/oss-security/2021/11/25/1
- https://bugzilla.redhat.com/show_bug.cgi?id=2025726
- https://access.redhat.com/errata/RHSA-2022:1975
- https://access.redhat.com/errata/RHSA-2022:1988
- https://access.redhat.com/security/cve/cve-2021-4002
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://www.debian.org/security/2022/dsa-5096
- https://www.openwall.com/lists/oss-security/2021/11/25/1
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://launchpad.net/bugs/cve/CVE-2021-4002
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2026926
- https://git.kernel.org/linus/a4a118f2eead1d6c49e00765de89878288d4b890
- https://security-tracker.debian.org/tracker/CVE-2021-4002
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4002
- https://nvd.nist.gov/vuln/detail/CVE-2021-4002
- https://ubuntu.com/security/CVE-2021-4002
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