CVE-2021-3640: Race Condition
First published: Fri Jul 09 2021(Updated: )
A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-425.3.1.rt7.213.el8 | 0:4.18.0-425.3.1.rt7.213.el8 |
| redhat/kernel | <0:4.18.0-425.3.1.el8 | 0:4.18.0-425.3.1.el8 |
| redhat/kernel | <0:5.14.0-162.6.1.el9_1 | 0:5.14.0-162.6.1.el9_1 |
| redhat/kernel-rt | <0:5.14.0-162.6.1.rt21.168.el9_1 | 0:5.14.0-162.6.1.rt21.168.el9_1 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| Linux Kernel | <4.4.293 | |
| Linux Kernel | >=4.5<4.9.291 | |
| Linux Kernel | >=4.10<4.14.256 | |
| Linux Kernel | >=4.15<4.19.218 | |
| Linux Kernel | >=4.20<5.4.160 | |
| Linux Kernel | >=5.5.0<5.10.80 | |
| Linux Kernel | >=5.11<5.14.19 | |
| Linux Kernel | >=5.15<5.15.3 | |
| Debian | =9.0 | |
| Fedora | =34 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =20.04 | |
| Ubuntu | =21.10 | |
| netapp h300s firmware | ||
| netapp h300s | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| netapp h410c firmware | ||
| netapp h410c | ||
| NetApp H500S Firmware | ||
| netapp h500s | ||
| All of | ||
| netapp h300s firmware | ||
| netapp h300s | ||
| All of | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| All of | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| All of | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| All of | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| All of | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| All of | ||
| netapp h410c firmware | ||
| netapp h410c | ||
| All of | ||
| NetApp H500S Firmware | ||
| netapp h500s |
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-2021-3640 https://nvd.nist.gov/vuln/detail/CVE-2021-3640 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951 https://lkml.org/lkml/2021/8/28/238 https://www.openwall.com/lists/oss-security/2021/07/22/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1980646
- https://access.redhat.com/errata/RHSA-2022:7444
- https://access.redhat.com/errata/RHSA-2022:7683
- https://access.redhat.com/errata/RHSA-2022:8267
- https://access.redhat.com/errata/RHSA-2022:7933
- https://access.redhat.com/security/cve/cve-2021-3640
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951
- https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951
- https://ubuntu.com/security/CVE-2021-3640
- https://www.openwall.com/lists/oss-security/2021/07/22/1
- https://www.debian.org/security/2022/dsa-5096
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://security.netapp.com/advisory/ntap-20220419-0003/
- https://launchpad.net/bugs/cve/CVE-2021-3640
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1984957
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1980646#c11
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1980646#c13
- https://lkml.org/lkml/2021/8/28/238
- https://lore.kernel.org/lkml/20211109010649.1191041-2-sashal@kernel.org/T/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1980646#c14
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=0771cbb3b97d3c1d68eecd7f00055f599954c34e
- https://access.redhat.com/errata/RHSA-2024:0724
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951
- https://security-tracker.debian.org/tracker/CVE-2021-3640
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3640
- https://nvd.nist.gov/vuln/detail/CVE-2021-3640
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2021-3640?
The severity of CVE-2021-3640 is rated as medium, posing a potential risk for denial of service or data corruption.
How do I fix CVE-2021-3640?
To fix CVE-2021-3640, upgrade to the recommended versions of the Linux kernel, specifically 0:4.18.0-425.3.1.el8 or higher.
What systems are affected by CVE-2021-3640?
CVE-2021-3640 affects multiple versions of the Linux kernel across various distributions including Red Hat, Ubuntu, and Debian.
Is CVE-2021-3640 a remote exploit?
CVE-2021-3640 is not a remote exploit but rather requires local access to trigger the vulnerability.
What mitigations exist for CVE-2021-3640?
Mitigations for CVE-2021-3640 involve applying the latest kernel updates that address the use-after-free flaw.
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